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Electro Industries /
GAUGETECH
EIG DNP 3.0 Protocol Assignments for Futura+ and DM Series
Power Monitors
Release Date: March 27, 2000
Version 1.10/03-2000
Electro Industries/Gaugetech assumes no responsibility for any inaccuracies and/or errors that may appear
in this document. The information printed in this document is subject to change without notice and should
not be construed as commitment by Electro Industries/Gaugetech E.I. Electronics, Inc.
All comments pertaining to this document should be forwarded to:
Attn: Engineering Dept. - DNP Object Mappings
Electro Industries/Gaugetech
1800 Shames Drive
Westbury, New York 11590
Tel: (516) 334-0870
Fax; (516) 338-4741
DNP is a trademark of the DNP Users Group.
Copyright © 2000 E.I. Electronics, Inc. Electro Industries/Gaugetech. All rights reserved.
Printed in the U.S.A.
Electro Industries /
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Table of Contents
1.
DNP IMPLEMENTATION ................................................................................................................ 1
1.1
PHYSICAL LAYER ............................................................................................................................... 1
1.1.1
RS-232C ....................................................................................................................................... 1
1.1.2
RS-485 .......................................................................................................................................... 1
1.1.3
Communication Parameters .......................................................................................................... 1
1.1.4
Baud Rates.................................................................................................................................... 1
1.2
DATA LINK LAYER ............................................................................................................................. 2
1.2.1
Length Field / Buffer Size ............................................................................................................ 2
1.2.2
Control Field................................................................................................................................. 2
1.2.2.1
Control Bits ......................................................................................................................... 2
1.2.2.2
Function Codes ................................................................................................................... 2
1.2.2.2.1 Reset of Data Link ( Function 0 ) ................................................................................... 2
1.2.2.2.2 User Data ( Function 3 ) ................................................................................................. 2
1.2.2.2.3 Unconfirmed User Data ( Function 4 ) .......................................................................... 2
1.2.3
Address ......................................................................................................................................... 2
1.3
TRANSPORT LAYER ............................................................................................................................ 3
1.3.1
Transport Header .......................................................................................................................... 3
1.4
APPLICATION LAYER .......................................................................................................................... 4
1.4.1
Application Headers ..................................................................................................................... 4
1.4.1.1
Application Control Field ................................................................................................... 4
1.4.1.2
Function Codes ................................................................................................................... 4
1.4.1.2.1 Read ( Function 1 ) ......................................................................................................... 4
1.4.1.2.2 Write ( Function 2 ) ........................................................................................................ 4
1.4.1.2.3 Select ( Function 3 ) ....................................................................................................... 4
1.4.1.2.4 Operate ( Function 4 ) .................................................................................................... 4
1.4.1.2.5 Direct Operate ( Function 5 ) ......................................................................................... 4
1.4.1.2.6 Direct Operate - No Acknowledgment ( Function 6 ) .................................................... 5
1.4.1.2.7 Response ( Function 129 ) .............................................................................................. 5
1.4.2
Application Data ........................................................................................................................... 5
1.4.2.1
Object and Variation ........................................................................................................... 5
1.4.2.1.1 Binary Input Status ( Obj. 1, Var. 2 ) ............................................................................. 6
1.4.2.1.1.1 Digital Inputs ( Points 0-3 ) .................................................................................... 6
1.4.2.1.2 Binary Output Status ( Obj. 10, Var. 2 ) ......................................................................... 7
1.4.2.1.2.1 Energy Reset State ( Point 0 ) ................................................................................. 7
1.4.2.1.2.2 Demand Reset State ( Point 1 ) ............................................................................... 7
1.4.2.1.2.3 Relay States ( Points 2-4 )....................................................................................... 7
1.4.2.1.3 Control Relay Output Block ( Obj. 12, Var. 1 ) ............................................................. 8
1.4.2.1.3.1 Energy Reset ( Point 0 ) .......................................................................................... 8
1.4.2.1.3.2 Demand Reset ( Point 1 ) ........................................................................................ 8
1.4.2.1.4 32-Bit Binary Counter Without Flag ( Obj. 20, Var. 5 ) ................................................ 9
1.4.2.1.4.1 Hour Readings ( Point 0 - 3 ) .................................................................................. 9
1.4.2.1.5 16-Bit Analog Input Without Flag ( Obj. 30, Var. 4 ) .................................................. 10
1.4.2.1.5.1 Health Check ( Point 0 ) ....................................................................................... 10
1.4.2.1.5.2 Phase Current ( Point 1 - 3 ) ................................................................................. 10
1.4.2.1.5.3 Phase-to-Neutral Voltage ( Point 4 - 6 ) ............................................................... 10
1.4.2.1.5.4 Total Power ( Point 7 - 8 ) .................................................................................... 11
1.4.2.1.5.5 Phase Power ( Point 9 - 14 ) ................................................................................. 11
1.4.2.1.5.6 CT & PT Ratios ( Point-15 - 18 ) ......................................................................... 11
1.4.2.1.5.7 Neutral Current ( Point 19 ) .................................................................................. 11
1.4.2.1.5.8 Frequency ( Point 20 ) .......................................................................................... 12
1.4.2.1.5.9 VA, Phase and Total ( Point 21 - 24 )................................................................... 12
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1.4.2.1.5.10 Power Factor, Phase and Total ( Point 25 - 28 ) ................................................. 12
1.4.2.1.5.11 Phase-to-Phase Voltage ( Point 29 - 31 ) ............................................................ 12
1.4.2.1.6 Time & Date ( Obj. 50, Var. 1 ) ................................................................................... 13
1.4.2.1.6.1 Current Time ( Point 0 )........................................................................................ 13
1.4.2.1.6.2 Mass Memory Storage Timestamp ( Point 1 - 3 ) ................................................. 13
1.4.2.1.7 Class 0 Data ( Obj. 60, Var. 1 ) .................................................................................... 14
1.4.2.1.8 Internal Indications ( Obj. 80, Var. 1 ) ......................................................................... 15
1.4.2.1.8.1 Device Restart ( Point 7 )...................................................................................... 15
1.4.2.1.9 Short Floating Point ( Obj. 100, Var. 1 ) ...................................................................... 16
1.4.2.1.9.1 Floating Point Units Field ..................................................................................... 16
1.4.2.1.9.2 Instantaneous, Average, Maximum and Minimum ( Point 0 - 203 ) ..................... 16
1.4.2.1.9.3 Harmonics Percentage and Phase ( Point 204 - 587 ) ........................................... 17
1.4.2.1.10 Large-Packed Binary Coded Decimal ( Obj. 101, Var. 3 ) ......................................... 19
1.4.2.1.10.1 Hour Readings ( Point 0 - 4 ) .............................................................................. 19
1.4.2.1.10.2 Action Object ( Point 5 )..................................................................................... 19
1.4.2.1.10.2.1 Switch to EI Protocol ( Value 1 ) ................................................................ 19
1.4.2.2
Qualifier and Range .......................................................................................................... 20
APPENDIX A : ANALOG INPUT SECONDARY TO PRIMARY CONVERSION ............................ 21
CONVERING FRACTIONAL TO SECONDARY ...................................................................................... 21
Example 1 ................................................................................................................................................. 21
CT AND PT RATIOS .................................................................................................................................. 22
Example 2 ................................................................................................................................................. 22
CONVERTING FRACTIONAL TO PRIMARY .......................................................................................... 23
Example 3 ................................................................................................................................................. 23
Example 4 ................................................................................................................................................. 23
APPENDIX B : ANALOG INPUT SCALING FOR ALTERNATE BACK MODULES ..................... 24
STANDARD BACK MODULE (120 V) ............................................................................................................... 24
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1.
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DNP Implementation
1.1
PHYSICAL LAYER
Electro Industries meters are capable OF using either RS-232C or RS-485 as the physical layer.
This is supplied through the use of the appropriate optional communication module, which can be ordered
with the meter or separately.
1.1.1
RS-232C
RS-232C is used for point-to-point communication only. Electro Industries meters are DCE
devices; they transmit on Pin 2 and receive on Pin 3. To connect to a DTE device, like the COM port of a
computer, a direct connection cable may be used. To connect to another DCE, a Null Modem cable ( one
which flips pins 2 and pin 3 ) must be used.
1.1.2
RS-485
RS-485 provides multi-drop network communication capabilities. Multiple meters may be placed
on the same bus, allowing for a Master device to communicate with any of the other devices. Appropriate
network configuration and termination should be evaluated for each installation to insure optimal
performance.
1.1.3



Communication Parameters
Electro Industries meters communicate in DNP 3.0 using the following communication settings:
8 Data Bits
No Parity
1 Stop Bit
1.1.4




Baud Rates
Electro Industries meters are programmable to use several standard baud rates, including:
1200 Baud
2400 Baud
4800 Baud
9600 Baud
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1.2
DATA LINK LAYER
The Data Link Layer as implemented on Electro Industries meters is subject to the following
considerations.
1.2.1
Length Field / Buffer Size
The internal buffers are limited to 256 bytes. After removing checksums and the headers for the
Data Link, Transport and Application Layers, this leaves 212 bytes for application data. Thus, the largest
Length allowable is 222 ( 0xDE ). Messages should be constructed with this limitation in mind.
1.2.2
Control Field
The Control byte contains several bits and a Function Code, Specific notes follow.
1.2.2.1 Control Bits
Communication directed to the meter should be Primary Master messages ( DIR = 1, PRM = 1 ).
Response will be primary Non-Master messages (DIR = 0, PRM = 1). Acknowledgment will be Secondary
Non-Master messages ( DIR = 0, PRM = 0 ).
1.2.2.2 Function Codes
Electro Industries meters support all of the Function Codes for DNP 3.0. Specific notes follow.
1.2.2.2.1
Reset of Data Link ( Function 0 )
Before confirmed communication with a master device, the Data Link Layer must be reset. This is
necessary after a meter has been restarted, either by applying power to the meter or reprogramming the
meter. The meter must receive a RESET command before confirmed communication may take place.
Unconfirmed communication is always possible and does not require a RESET.
1.2.2.2.2
User Data ( Function 3 )
After receiving a request for USER DATA, the meter will generate a Data Link
CONFIRMATION, signaling the reception of that request, before the actual request is processed. If a
response is required, it will also be sent as UNCONFIRMED USER DATA.
1.2.2.2.3
Unconfirmed User Data ( Function 4 )
After receiving a request for UNCONFIRMED USER DATA, if a response is required, it will be
sent as UNCONFIRMED USER DATA.
1.2.3
Address
DNP 3.0 allows for addresses from 0 - 65534 ( 0x0000 - 0xFFFE ) for individual device
identification, with the address 65535 ( 0xFFFF ) defined as an all stations address. Electro Industries
meters’ addresses are programmable from 0 - 9999 ( 0x0000 - 0x270F ), and will recognize address 65535
( 0xFFFF ) as the all stations address.
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DNP Implementation
1.3
TRANSPORT LAYER
The Transport Layer as implemented on Electro Industries meters is subject to the following
considerations.
1.3.1
Transport Header
Multiple-frame messages are not allowed for Electro Industries meters. Each Transport Header
should indicate it is both the first frame ( FIR = 1 ) as well as the final frame ( FIN = 1 ).
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DNP Implementation
1.4
APPLICATION LAYER
The Application Layer contains a header ( Request or Response Header, depending on direction )
and data. Specific notes follow.
1.4.1
Application Headers
Application Headers contain the Application Control Field and the Function Code.
1.4.1.1 Application Control Field
Multiple-fragment messages are not allowed for Electro Industries meters. Each Application
Header should indicate it is both the first fragment ( FIR = 1 ) as well as the final fragment ( FIN = 1 ).
Application-Level confirmation is not used for Electro Industries meters.
1.4.1.2 Function Codes
The following Function codes are implemented on Electro Industries meters.
1.4.1.2.1
Read ( Function 1 )
Objects supporting the READ function are:
 Binary Inputs (Object 1)
 Binary Outputs ( Object 10 )
 Counters ( Object 20 )
 Analog Inputs ( Object 30 )
 Time & Date ( Object 50 )
 Class ( Object 60 )
 Floating Point ( Object 100 )
 Packed BCD ( Object 101 )
These Objects may be read either by requesting a specific Variation available as listed in this
document, or by requesting Variation 0. READ request for Variation 0 of an Object will be fulfilled with
the Variation listed in this document.
1.4.1.2.2
Write ( Function 2 )
Objects supporting the WRITE function are:
 Internal Indications ( Object 80 )
 Packed BCD ( Object 101 )
1.4.1.2.3
Select ( Function 3 )
Objects supporting the SELECT function are:
 Control Relay Output Block ( Object 12 )
Use of this function starts a 1 second timer for a legal use of the Operate ( Function 4 ) function.
1.4.1.2.4
Operate ( Function 4 )
Objects supporting the OPERATE function are:
 Control Relay Output Block ( Object 12 )
Use of this function can legally be performed only within 1 second of reception of the appropriate
Select ( Function 3 ) function.
1.4.1.2.5
Direct Operate ( Function 5 )
Objects supporting the DIRECT OPERATE function are:
 Control Relay Output Block ( Object 12 )
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DNP Implementation
1.4.1.2.6
Direct Operate - No Acknowledgment ( Function 6 )
Objects supporting the DIRECT OPERATE - NO ACKNOWLEDGMENT function are:
 Control Relay Output Block ( Object 12 )
1.4.1.2.7
Response ( Function 129 )
Application responses from Electro Industries meters use the RESPONSE function.
1.4.2
Application Data
Application Data contains information about the Object and Variation, as well as the Qualifier and
Range.
1.4.2.1 Object and Variation
The following Objects and Variations are supported on Electro Industries meters.
 Binary Input Status (Object 1, Variation 2) †
 Binary Output Status ( Object 10, Variation 2) †
 Control Relay Output Block ( Object 12, Variation 1 )
 32-Bit Binary Counter Without Flag ( Object 20, Variation 5 ) †
 16-Bit Analog Input Without Flag ( Object 30, Variation 4 ) †
 Time & Date ( Object 50, Variation 1 ) †
 Class 0 Data ( Object 60, Variation 1 ) †
 Internal Indications ( Object 80, Variation 1 )
 Short Floating Point ( Object 100, Variation 1 ) †
 Large-Packed Binary Coded Decimal ( Object 101, Variation 3 ) †
† READ requests for Variation 0 will be honored with the above Variations.
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1.4.2.1.1
Binary Input Status ( Obj. 1, Var. 2 )
Binary Input Statuses support the following functions:
 Read ( Function 1 )
A READ request for Variation 0 will be responded to with Variation 2.
Binary Input Statuses may be indexed with Qualifier Codes 0, 1, 2 or 6.
Binary Input Statuses are used to communicate the following data measured by Electro Industries
meters:
 Digital Inputs
1.4.2.1.1.1
Digital Inputs ( Points 0-3 )
Some Electro Industries meters are optionally capable of monitoring digital inputs. Binary Input
Status points report the state of these inputs. If the feature is not present on this device, the point is reported
as being off-line. If the feature is present, the point is reported as being on line.
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DNP Implementation
1.4.2.1.2
Binary Output Status ( Obj. 10, Var. 2 )
Binary Output Statuses support the following functions:
 Read ( Function 1 )
A READ request for Variation 0 will be responded to with Variation 2.
Binary Output Statuses may be indexed with Qualifier Codes 0, 1, 2 or 6.
Binary Output Statuses are used to communicate the following data measured by Electro Industries
meters:
 Energy Reset State
 Demand Reset State
 Relay States
1.4.2.1.2.1
Energy Reset State ( Point 0 )
Electro Industries meters accumulate power generated or consumed over time as Hour Readings,
which measure positive VA Hours and positive and negative W Hours and VAR Hours. These readings
may be reset using a Control Relay Output Block object ( Obj 12 ). This Binary Output Status point reports
whether the Energy Readings are in the process of being reset, or if they are accumulating. Normally,
readings are being accumulated and the state of this point is read as ‘0’. If the readings are in the process of
being reset, the state of this point is read as ‘1’.
1.4.2.1.2.2
Demand Reset State ( Point 1 )
Electro Industries meters maintain maximum readings on most paramters. These readings may be
reset using a Control Relay Output Block object ( Obj 12 ). This Binary Output Status point reports
whether the Demand Readings are in the process of being reset, or if they are active. Normally, maximums
are being monitored and the state of this point is read as ‘0’. If the readings are in the process of being
reset, the state of this point is read as ‘1’.
1.4.2.1.2.3
Relay States ( Points 2-4 )
Some Electro Industries meters are optionally capable of producing digital outputs using relays.
These Binary Output Status points report the state of these relays. If the feature is not present on this
device, the point is reported as being off-line. If the feature is present, the point is reported as being on line.
A reading of ‘1’ equals Open, or de-energized. A reading of ‘0’ equals Closed, or energized.
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DNP Implementation
1.4.2.1.3
Control Relay Output Block ( Obj. 12, Var. 1 )
Control Relay Output Blocks support the following functions:
 Select ( Function 3 )
 Operate ( Function 4 )
 Direct Operate ( Function 5 )
 Direct Operate - No Acknowledgment ( Function 6 )
Control Relay Output Blocks may be indexed with Qualifier Codes 7, 8 or 9 when used with the
Select ( Function 3 ) and Operate ( Function 4 ) functions.
Control Relay Output Blocks may be indexed with Qualifier Codes 0, 1 or 2 when used with the
Direct Operate ( Function 5 ) and Direct Operate No Acknowledge ( Function 6 ) functions.


Control Relay Output Blocks are used for the following purposes:
Energy Reset
Demand Reset
1.4.2.1.3.1
Energy Reset ( Point 0 )
Electro Industries meters accumulate power generated or consumed over time as Hour Readings,
which measure positive VA Hours and positive and negative W Hours and VAR Hours. These readings
may be reset using Point 0.
Use of the SELECT ( Function 3 ) and OPERATE ( Function 4 ) functions will operate using any
settings for the parameters of Control Code, Count, On Time, Off Time and Status.
Use of the DIRECT OPERATE ( Function 5 ) or DIRECT OPERATE - NO ACKNOWLEDGE
( Function 6 ) functions will operate only with the settings of Pulsed ON ( Code = 1 of Control Code Field)
once ( Count = 0x01 ) for ON 1 millisecond and OFF 0 milliseconds.
1.4.2.1.3.2
Demand Reset ( Point 1 )
Electro Industries meters maintain maximum readings on most paramters. These readings may be
reset using Point 1.
Use of the SELECT ( Function 3 ) and OPERATE ( Function 4 ) functions will operate using any
settings for the parameters of Control Code, Count, On Time, Off Time and Status.
Use of the DIRECT OPERATE ( Function 5 ) or DIRECT OPERATE - NO ACKNOWLEDGE
( Function 6 ) functions will operate only with the settings of Pulsed ON ( Code = 1 of Control Code Field)
once ( Count = 0x01 ) for ON 1 millisecond and OFF 0 milliseconds.
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DNP Implementation
1.4.2.1.4
32-Bit Binary Counter Without Flag ( Obj. 20, Var. 5 )
Counters support the following functions:
 Read ( Function 1 )
A READ request for Variation 0 will be responded to with Variation 5.
Counters may be indexed with Qualifiers Codes 0, 1, 2 or 6.

Counters are used to communicate the following data measured by Electro Industries meters:
Hour Readings
1.4.2.1.4.1
Hour Readings ( Point 0 - 3 )
Point
Readings
Unit
0
+kW Hour
kWH
1
-kW Hour
kWH
2
+kVAR Hour
kVARH
3
-kVAR Hour
kVARH
These readings may be cleared by using the Control Relay Output Block.
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DNP Implementation
1.4.2.1.5
16-Bit Analog Input Without Flag ( Obj. 30, Var. 4 )
Analog Inputs support the following functions:
 Read ( Function 1 )
A READ request for Variation 0 will be responded to with Variation 4.
Analog Inputs may be indexed with Qualifier Codes 0, 1, 2 or 6.











Analog Inputs are used to communicate the following data measured by Electro Industries meters:
Health Check
Phase Current
Phase-to-Neutral Voltage
Total Power
Phase Power
CT & PT Ratios
Neutral Current
Frequency
VA, Phase and Total
Power Factor, Phase and Total
Phase-to-Phase Voltage
1.4.2.1.5.1
Health Check ( Point 0 )
The Health Check point is used to indicate problems detected by the meter. A value of zero
( 0x0000 ) indicates the meter does not detect a problem. Non-zero values indicate a detected anomaly.
1.4.2.1.5.2
Phase Current ( Point 1 - 3 )
Point
Reading
1
Phase A Current
2
Phase B Current
3
Phase C Current
These points are formatted as 2’s compliment fractions. They represent a fraction of a
10 A Secondary input. Inputs of above 10 A Secondary will be pinned at 10 A Secondary. For a further
explanation of the format of these readings, see Appendix A.
1.4.2.1.5.3
Phase-to-Neutral Voltage ( Point 4 - 6 )
Point
Reading
4
Phase AN Voltage
5
Phase BN Voltage
6
Phase CN Voltage
These points are formatted as 2’s compliment fractions. For a standard back meter, they represent
a fraction of a 150 V Secondary input. Inputs of above 150 V Secondary will be pinned at
150 V Secondary. For a further explanation of the format of these readings, see Appendix A. For units
with back modules other than the standard back module, (G or 300 V, or L or 75 V), see Appendix B.
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DNP Implementation
1.4.2.1.5.4
Total Power ( Point 7 - 8 )
Point
Reading
7
Total Watt
8
Total VAR
These points are formatted as 2’s compliment fractions. For a standard back meter, they represent a
fraction of 4500 W Secondary in normal operation, or 3000 W Secondary in Open Delta operation. Inputs
above/below +/-4500 or +/-3000 W Secondary will be pinned at +/-4500 or +/-3000 W Secondary,
respectively. For a further explanation of the format of these readings, see Appendix A. For units with
back modules other than the standard back module, (G or 300 V, or L or 75 V), see Appendix B.
1.4.2.1.5.5
Phase Power ( Point 9 - 14 )
Point
Reading
9
Phase A Watt
10
Phase B Watt
11
Phase C Watt
12
Phase A VAR
13
Phase B VAR
14
Phase C VAR
These points are formatted as 2’s compliment fractions. For a standard back meter, they represent
a fraction of 1500 W Secondary. Inputs above/below +/-1500 W Secondary will be pinned at
+/-1500 W Secondary. When in Open Delta operation, these points are always zero. For a further
explanation of the format of these readings, see Appendix A. For units with back modules other than the
standard back module, (G or 300 V, or L or 75 V), see Appendix B.
1.4.2.1.5.6
CT & PT Ratios ( Point-15 - 18 )
Point
Value
15
CT Ratio Numerator
16
CT Ratio Denominator
17
PT Ratio Numerator
18
PT Ratio Denominator
These points are formatted as 2’s compliment integers. They can be used to convert from units in
terms of the Secondary of a CT or PT into units in terms of the Primary of a CT or PT. The ratio of
Numerator divided by Denominator is the ratio of Primary to Secondary.
Electro Industries meters typically use Full Scales relating Primary Current to 5 Amps and Primary
Voltage to 120 V. However, these Full scales can range from mA’s to thousands of kA’s, or mV’s to
thousands of kV’s. The following rules apply:
 Full Scales containing fractions of Amps or Volts are truncated before being represented.
 Full Scales below 32,767 A : 5 A or 32,767 V : 120 V will be represented exactly, in that format. ( Ex.
14.40 kV : 120 V ( 120 : 1 ) would be represented as PT Ratio Numerator = 14,400 ( 0x3840 ), PT
Ratio Denominator = 120 ( 0x0078 ) )
 Full Scales above 32,767 A : 5 A or 32, 767 V : 120 V get represented as a Primary in terms of a
Secondary which is a power of 2. This may produce a ratio that is not exact. ( Ex. 50 kA : 5 A
( 10,000 : 1 ) would be represented as CT Ratio Numerator = 20,000 ( 0x4E20 ), CT Ratio
Denominator = 2 ( 0x0002 ) )
 Full Scales which are above 32,767 A : 1 A or 32,767 V : 1 V get pinned at 32,767 A : 1 A or
32,767 V : 1 V
1.4.2.1.5.7
Neutral Current ( Point 19 )
This point is formatted as a 2’s compliment fraction. It represents a fraction of 15 A Secondary.
Inputs above 15 A Secondary will be pinned at 15 A Secondary. When in Open Delta operation, this point
is always zero. For a further explanation of the format of these readings, see Appendix A.
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DNP Implementation
1.4.2.1.5.8
Frequency ( Point 20 )
This point is formatted as a 2’s compliment integer. It represents the Frequency as measured on
Phase A Voltage in units of cHz ( centiHertz, 1/100 Hz ). Inputs below 45.00 Hz are pinned at 0
( 0x0000 ), while inputs above 75.00 Hz are pinned at 9999 ( 0x270F ).
1.4.2.1.5.9
VA, Phase and Total ( Point 21 - 24 )
Point
Reading
21
Phase A VA
22
Phase B VA
23
Phase C VA
24
Total VA
These points are formatted as 2’s compliment fractions. Points 21-23 represent a fraction of 1500
W Secondary. Inputs above/below +/-1500 w Secondary will be pinned at +/-1500 W Secondary. When in
Open Delta, points 21-23 are always zero. Point 24 represents a fraction of 4500 W Secondary in normal
operation, or 3000 W Secondary in Open Delta operation. Inputs above/below +/-4500 or +/-3000 W
Secondary will be pinned at +/-4500 or +/-3000 W Secondary, respectively. For a further explanation of the
format of these readings, see Appendix A. For units with back modules other than the standard back
module, (G or 300 V, or L or 75 V), see Appendix B.
1.4.2.1.5.10
Power Factor, Phase and Total ( Point 25 - 28 )
Point
Reading
25
Phase A Power Factor
26
Phase B Power Factor
27
Phase C Power Factor
28
Total Power Factor
These points are formatted as 2’s compliment integers. They represent Power Factors from –1.000
( 0x0FC18 ) to +1.000 ( 0x003E8 ). When in Open Delta operation, Phase Power Factor ( Points 25-27 )
are always zero.
1.4.2.1.5.11
Phase-to-Phase Voltage ( Point 29 - 31 )
Point
Reading
29
Phase AB Voltage
30
Phase BC Voltage
31
Phase CA Voltage
These points are formatted as 2’s compliment fractions. For a standard back meter, they represent
a fraction of a 300 V Secondary input. Inputs of above 300 V Secondary will be pinned at
300 V Secondary. For a further explanation of the format of these readings, see Appendix A. For units
with back modules other than the standard back module, (G or 300 V, or L or 75 V), see Appendix B.
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DNP Implementation
1.4.2.1.6
Time & Date ( Obj. 50, Var. 1 )
Time & Dates support the following functions:
 Read ( Function 1 )
A READ request for Variation 0 will be responded to with Variation 1.
Time & Dates may be indexed by Qualifier Codes 0, 1, 2 or 6.


Time & Dates are used to report the following information stored in an Electro Industries meter:
Current Time
Time of most recently stored Snapshot, Event and Waveform
Meters that do not have real-time capability do not support the Time & Date Object.
1.4.2.1.6.1
Current Time ( Point 0 )
Meters that have real-time capability use this point to report the Current Time. Meters that could
have real-time capability, but do not have it installed, return the default time of midnight, January 1, 1970.
1.4.2.1.6.2
Mass Memory Storage Timestamp ( Point 1 - 3 )
Point
Reading
1
Most Recent Snapshot
2
Most Recent Event
3
Most Recent Waveform
Meters that have Mass Memory capability use these points to report the time of the most recent
Snapshot, Event and Waveform. Should a log be empty or not present on a particular meter, it will return
the default time of midnight, January 1, 1970.
Electro Industries /
GAUGETECH
13
DNP Implementation
1.4.2.1.7
Class 0 Data ( Obj. 60, Var. 1 )
Class Data support the following functions:

Read ( Function 1 )
A request for Class 0 Data from an Electro Industries meter will return four Object Headers.
Specifically, it will return 16-Bit Analog Input Without Flags ( Object 30, Variation 4 ), Points 0 - 31,
followed by 32-Bit Counters Without Flags ( Object 20, Variation 5 ), Points 0 – 3, followed by Binary
Output Status ( Object 10, Variation 2 ), Points 0-4, followed by Binary Input Status ( Object 1, Variation
2), Points 0-3.
A request for Object 60, Variation 0 will be treated as a request for Class 0 Data.
Class Data may be indexed with Qualifier Code 6.
Electro Industries /
GAUGETECH
14
DNP Implementation
1.4.2.1.8
Internal Indications ( Obj. 80, Var. 1 )
Internal Indications support the following functions:
 Write ( Function 2 )
Internal Indications may be indexed by Qualifier Codes 0, 1, or 2.
1.4.2.1.8.1
Device Restart ( Point 7 )
This bit is set whenever the meter has reset. The polling device may clear this bit by Writing
( Function 2 ) to Object 80, Point 7.
Electro Industries /
GAUGETECH
15
DNP Implementation
1.4.2.1.9
Short Floating Point ( Obj. 100, Var. 1 )
Floating Points support the following functions:
 Read ( Function 1 )
A READ request for Variation 0 will be responded to with Variation 1.
Floating Points may be indexed with Qualifier Code 0, 1, 0r 2.
Floating Points are used to communicate the following data measured by Electro Industries meters:
Instantaneous, Average, Maximum and Minimum Readings
Harmonics Percentages and Phases
Floating Point representation of these quantities allows for transfer of values without overrange
worries. For example, with appropriate programming, Electro Industries meters can display Power readings
down to 1 W Primary and up to 9,999 MW Primary, signed positive or negative. This is a range of
+/-10 billion values. 16- and 32-Bit Integer representations possess ranges of +/-32,767 and
+/-2,147,483,648 values, respectively. Either they will produce over/under range situations, or will require
the use of multiple Object Points, either for extending their bit-range by concatenation or for scaling, by
multiplication. Short Floating Point, which complies with the IEEE-754 standard for floating-point number
representation, possesses a range greater than +/-1038. This range allows for a consistent representation
using a single Object Point of all readings.


1.4.2.1.9.1
Floating Point Units Field
The following values are used in the Units Field of Short Floating Point objects:
Unit Field Value
Engineering Units
2
Volts RMS ( VRMS )
3
Amperes RMS ( ARMS )
4
kiloWatts ( kW )
5
kiloVA ( kVA )
6
kiloVAR ( kVAR )
9
Power Factor
10
Frequency ( Hz, cycles/second )
123 †
% Total Harmonic Distortion ( % )
124 †
Harmonics Magnitude ( % )
125 †
Harmonics Phase ( , degrees )
126 †
K-Factor
127 †
Reserved
† Values of 123 - 127 are not defined in DNP 3.0, and have been given the above meanings.
1.4.2.1.9.2
Instantaneous, Average, Maximum and Minimum ( Point 0 - 203 )
Readings
Inst. Point
Ave. Point
+Max Point
+Min Point
Phase AN Volt †
Phase BN Volt †
Phase CN Volt †
Phase AB Volt
Phase BC Volt
Phase CA Volt
Phase A Current
Phase B Current
Phase C Current
Phase N Current †
Total Watt
0
1
2
3
4
5
6
7
8
9
10
45
46
47
48
49
50
51
52
53
54
55
90
91
92
93
94
95
96
97
98
99
100
135
136
137
138
139
140
141
142
143
144
145
Electro Industries /
GAUGETECH
-Max
Point
-Min
Point
180
192
Unit
Field
2
2
2
2
2
2
3
3
3
3
4
16
DNP Implementation
Total VAR
Total VA
Total PF
Total Freq
Phase A Watt †
Phase B Watt †
Phase C Watt †
Phase A VAR †
Phase B VAR †
Phase C VAR †
Phase A VA †
Phase B VA †
Phase C VA †
Phase A PF †
Phase B PF †
Phase C PF †
AN Volt THD †‡
BN Volt THD †‡
CN Volt THD †‡
A Current THD †‡
B Current THD †‡
C Current THD †‡
AN Volt KF †‡
BN Volt KF †‡
CN Volt KF †‡
A Current KF †‡
B Current KF †‡
C Current KF †‡
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
181
193
182
194
183
184
185
186
187
188
195
196
197
198
199
200
189
190
191
201
202
203
6
5
9
10
4
4
4
6
6
6
5
5
5
9
9
9
123
123
123
123
123
123
126
126
126
126
126
126
127
127
127
127
127
127
† Meters in Open Delta operation will report these values as zero.
‡ Meters that do not compute these values will report them as zero and Unit Field = 127
These points are Floating Point values. They represent the Primary of quantities that the meter
measures.
1.4.2.1.9.3
Harmonics Percentage and Phase ( Point 204 - 587 )
Reading
Phase AN Volt
Percent
Phase
0 ( DC )
204
205
1 ( Fund )
206
207
2
208
209
Phase BN Volt
Percent
Phase
268
269
270
271
Phase CN Volt
Percent
Phase
332
333
Phase A Current
Percent
Phase
396
397
Electro Industries /
GAUGETECH
...
31
266
267
Unit Field
124
125
272
273
330
331
124
125
334
335
336
337
394
395
124
125
398
399
400
401
458
459
124
125
17
DNP Implementation
Phase B Current
Percent
Phase
460
461
462
463
464
465
522
523
124
125
Phase C Current
Percent
524
526
528
586
124
Phase
525
527
529
587
125
These points are Floating Point values. They represent the Percentage and Phase information for
the DC Offset, Fundamental Frequency and Harmonics up to the 31st Order.
Electro Industries /
GAUGETECH
18
DNP Implementation
1.4.2.1.10
Large-Packed Binary Coded Decimal ( Obj. 101, Var. 3 )
Large-Packed Binary Coded Decimals support the following functions:
 Read ( Function 1 )
 Write ( Function 2 )
A READ request for Variation 0 will be responded to with Variation 3.
Large-Packed Binary Coded Decimals may be indexed with Qualifier Codes 0, 1, 2 or 6.
Large-Packed Binary Coded Decimals are used to communicate the following data measured by
Electro Industries meters:
 Hour Readings
 the Action Object
1.4.2.1.10.1
Hour Readings ( Point 0 - 4 )
Point
Reading
Unit
0
+W Hour
WH
1
-W Hour
WH
2
+VAR Hour
VARH
3
-VAR Hour
VARH
4
+VA Hour
VAH
These readings may be cleared by using the Control Relay Output Block.
1.4.2.1.10.2
Action Object ( Point 5 )
The WRITE ( Function 2 ) function may be used to request different actions of an Electro
Industries meter. The following actions are supported:
 Switch to EI Protocol
1.4.2.1.10.2.1 Switch to EI Protocol ( Value 1 )
Using the WRITE ( Function 2 ) function to write the value 1 to the Action Object ( Object 101,
Variation 3, Point 5 ) requests the meter to reprogram itself, changing the protocol assignment for the
current port from DNP 3.0 to EI Protocol. This allows for other available software to be used with the
current meter.
Electro Industries /
GAUGETECH
19
DNP Implementation
1.4.2.2 Qualifier and Range
Electro Industries meters operate with Qualifier Codes 0, 1, 2 or 6. For codes 0, 1 and 2, the Range
field contains 1 byte ( Q-code = 0 ), 2 byte ( Q-code = 1 ) or 4 byte ( Q-code = 2 ) Start Range and Stop
Range values, as Indices of data.
Qualifier Code 6 may also be used with the following objects:
 Counter
(object 20)
 Analog Inputs (object 30)
 Time & Dates (object 50)
 Class & Data (object 60)
 Large-Packed Binary Coded Decimals
(object 101)
Request with Qualifier Code 6 will return all of the points of the specified object.
Electro Industries /
GAUGETECH
20
DNP Implementation
Electro Industries /
GAUGETECH
Appendix A : Analog Input Secondary to Primary Conversion
Converting Fractional to Secondary
Most of the Analog Input ( Object 30 ) points are formatted as 2’s compliment fractions. The
Analog Input value varies from +32,767 to -32,768. Divided by 32,768, this produces the fraction.
Multiplying the fraction by the Secondary scale of the particular Analog Input produces the Secondary
value. The equation is therefore:
Secondary Value 
Analog Input
 Secondary Scale
32768
Example 1:
Analog Input Point 4 ( Phase AN Voltage ) returns with the value of 16,384 ( 0x4000 ). The
Secondary Scale for this point is 150 Volts Secondary. By the above equation, the Secondary Value is:
16384
 150 V Secondary = 75 V Secondary
32768
Electro Industries /
GAUGETECH
DNP Implementation : Appendix A
CT and PT Ratios
To convert from Secondary to Primary, the CT and/or PT Ratio is needed. These ratios may be
found by dividing the Ratio Numerator ( Object 30, Point 15 or 17 ) by the corresponding Ratio
Denominator ( Object 30, Point 16 or 18 ). The equation is therefore:
Ratio =
Ratio Numerator
Ratio Denominator
Example 2:
Analog Input Point 17 ( PT Ratio Numerator ) = 19,200 ( 0x4B00 ) and Point 18 ( PT Ratio
Denominator ) = 16 ( 0x0010 ). By the above equation, the PT Ratio is:
19200
 12001
:
16
Electro Industries /
GAUGETECH
22
DNP Implementation : Appendix A
Converting Fractional to Primary
Combining the above two equations, the method of converting a 2’s compliment fraction
representing a Secondary value into the equivalent Primary value would use the following equation:
Primary Value =
Analog Input
Ratio Numerator
 Secondary Scale 
32768
Ratio Denominator
Example 3:
Analog Input Point 1 ( Phase A Current ) returns with a value of 9,871 ( 0x268F ), Analog Input
Point 15 ( CT Ratio Numerator ) with a value of 2,000 ( 0x07D0 ) and Analog Input Point 16 ( CT Ratio
Denominator ) with a value of 5 ( 0x0005 ). The Secondary Scale for Point 1 is 10 A Secondary. By the
above equation, the Primary Value is:
9871
2000
 10 A Secondary 
 1205 A Primary
32768
5
Example 4:
The meter is in Open Delta operation. Analog Input Point 7 ( Total Watt ) returns with a value
of -12,754 ( 0xCE2E ), Analog Input Point 15 ( CT Ratio Numerator ) with a value of 1000 ( 0x03E8 ),
Analog Input Point 16 ( CT Ratio Denominator ) with a value of 5 ( 0x0005 ), Analog Input Point 17 ( PT
Ratio Numerator ) with a value of 12,000 ( 0x2EE0 ) and Analog Input Point 18 ( Pt Ratio Denominator )
with a value of 120 ( 0x0078 ). When operating in Open Delta, the Secondary Scale for Point 7 is
3000 W Secondary. By the above equation, the Primary Value is:
12754
1000  12000
 3000 W Secondary 
 23.35 MW Primary
32768
5  120
Electro Industries /
GAUGETECH
23
DNP Implementation : Appendix A
Electro Industries /
GAUGETECH
Appendix B : Analog Input Scaling for Alternate Back Modules
Standard Back Module (120 V)
Voltage readings are scaled relative to the range of the voltage back module. A standard back
meter is capable of measuring voltages Phase-to-Neutral up to 150 Volts secondary, and Phase-to-Phase up
to 300 Volts secondary. PT Ratios are entered relative to 120 Volts secondary. Voltage and Power
readings are scaled as described in their respective sections.
G Back Module (300 V)
A G back meter is capable of measuring voltages Phase-to-Neutral up to 300 Volts secondary, and
Phase-to-Phase up to 600 Volts secondary. PT Ratios are entered relative to 300 Volts secondary.
The difference in PT Ratios introduces a difference in scaling voltage and power readings. An
extra factor of 300/120, or 2.5, is introduced when interpreting voltage and power readings on a G back
meter.
The scaling of phase-to-neutral voltages is to 375 Volts secondary, not 150 Volts secondary,
phase-to-phase voltages is to 750 Volts secondary, not 300Volts secondary. Watt, VAR and VA per phase
is scaled to 3750 Watt, VAR or VA secondary, and not to 1500. Total Watt, VAR and VA values are
scaled to 7500 Watt, VAR or VA secondary in DELTA and 11,250 Watt, VAR or VA secondary WYE,
instead of 3000 in DELTA or 4500 in WYE.
L Back Module (75 V)
An L back meter is capable of measuring voltages Phase-to-Neutral up to 75 Volts secondary, and
Phase-to-Phase up to 150 Volts secondary. PT Ratios are entered relative to 75 Volts secondary.
The difference in PT Ratios introduces a difference in scaling voltage and power readings. An
extra factor of 75/120, or 5/8 (0.625), is introduced when interpreting voltage and power readings on an L
back meter.
The scaling of phase-to-neutral voltages is to 93.75 Volts secondary, not 150 Volts secondary,
phase-to-phase voltages is to 750 Volts secondary, not 187.5 Volts secondary. Watt, VAR and VA per
phase is scaled to 937.5 Watt, VAR or VA secondary, and not to 1500. Total Watt, VAR and VA values
are scaled to 1875 Watt, VAR or VA secondary in DELTA and 2812.5 Watt, VAR or VA secondary WYE,
instead of 3000 in DELTA or 4500 in WYE.
Electro Industries /
GAUGETECH
DNP Implementation : Appendix A