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This Datasheet is for the
IC693ALG220
Analog Voltage Input - 4 Channel
http://www.qualitrol.com/shop/p-14570-ic693alg220.aspx
Provides the wiring diagrams and installation guidelines for this
GE Series 90-30 module.
For further information, please contact Qualitrol Technical Support at
1-800-784-9385
[email protected]
Chapter 10 Analog Input Modules
section level 1 1
figure bi level 1
table_big level 1
10
Analog Voltage Input - 4 Channel
IC693ALG220
The 4-Channel Analog Voltage Input module for the Series 90-30 Programmable Logic
Controller provides four input channels, each capable of converting an analog input signal to a
digital signal for use as required by your application. The Analog Voltage Input module is
capable of converting inputs in the range of –10 to +10 volts. Conversion speed for each of the
four channels is one millisecond. This provides an update rate of four milliseconds for any
channel. Resolution of the converted signal is 12 bits binary (1 part in 4096).
User data in the %AI registers is in 16-bit 2’s complement format. The placement of the 12
bits from the A/D converter in the %AI data word is shown below. The relationship between
the voltage input and the data from the A/D converter is shown in Figure 3-10.
LSB
MSB
S
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X = not applicable to this discussion.
S = sign bit
a44652
2000
A/D
BITS 0
(decimal)
2000
10
0
10
VOLTAGE (V)
Figure 10-1. A/D Bits vs. Voltage Input
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10-1
10
Scaling of the input is shown below in Figure 3-11.
a44653
32000
%AI
(decimal) 0
32000
10
0
10
VOLTAGE (V)
Figure 10-2. Scaling for Voltage Input
A limited current input mode is also provided in the module. A jumper is provided on the user
terminal connector for each channel, which may be used to connect the internal 250 ohm shunt
resistor into the circuit. The shunt resistor effectively provides a –40 to +40 mA current input
range. However, the input current should generally not exceed ±20 mA, to avoid self-heating
of the input resistor and a corresponding loss of accuracy. A 4 to 20 mA input corresponds to a
1 to 5 volt input to the voltage input module; therefore, the resolution of the 4 to 20 mA input
signal is approximately 10 bits binary (1 part in 1024). The resolution can be increased to
approximately 11 bits (1 part in 2048) by using a precision 250 ohm resistor in place of the
jumper. The resistor causes the voltage input module to see a 4 to 20 mA input as 2 to 10 volts.
The main power source for the module is derived from the isolated +24 VDC power supplied
by the PLC power supply. This voltage is routed through an inverter/regulator to produce the
operating voltages for the module. This module also consumes 27 mA from the +5 VDC
output of the PLC power supply. An LED at the top of the module’s faceplate is ON when the
module’s power supply is operating. The module provides electrical isolation of externally
generated noise between the field wiring and the backplane through optical isolation.
To minimize the capacitive loading and noise, all field connections to the module should be
wired using a good grade of twisted, shielded instrumentation cable. The shields can be
connected to either COM or GND. The COM connection provides access to the common of the
analog circuitry in the module. The GND connection provides access to the baseplate (frame
ground).
This module can be installed in any I/O slot of a 5 or 10-slot baseplate in a Series 90-30 PLC
system. See page 3-11 to determine the number of Analog Voltage Input modules that can be
installed in a system.
Note
Connect the + and – terminals together for all unused inputs in order to minimize
any fluctuations in the analog input table for the unused points.
10-2
Series 90-30 PLC I/O Module Specifications – July 2000
GFK-0898F
10
Analog Input Modules
Table 10-1. Specifications for Analog Voltage Input Module - IC693ALG220
Voltage Range
Calibration
–10 to +10 volts [
Factory calibrated
Update Rate
Resolution
Absolute Accuracy ]
4 msec (all four channels)
5 mV/20 µA, (1 LSB = 5 mV)
±10 mV/40 µA (typical) over operating temperature
±30 mV/160 µA (maximum) over operating temperature
< 1 Least Significant Bit
Linearity
Isolation
Cross-Channel Rejection
Input Impedance
1500 volts between field side and logic side
> 80 db
> 9 Megohms (voltage mode)
250 ohms (current mode)
Input Filter Response
17 Hz
Internal Power Consumption
27 mA from +5 volt bus on the backplane
98 mA from the isolated +24 volt backplane bus
Refer to Appendix C for product standards and general specifications.
[ Both inputs must be within ± 11 volts of COM, including any noise present on the inputs.
] In the presence of severe RF interference (IEC 801-3, 10V/m), accuracy may be degraded to ±100 mV/400 µA.
Analog Voltage Input Block Diagram
The following figure is a block diagram of the 4-Channel Analog Voltage Input Module.
a43844
COM
I 24V
I GND
PWR
INVERTER/
REGULATOR
AND
VOLTAGE
SUPERVISOR
4:1
MUX
+15V
0V
4
CHANNELS
( +)
FILTERS
(
+ 5V
5V
15V
250 Ω
0.5W
DIFFERENTIAL
AMPLIFIER
JMP
TIMING
GENERATOR
FRAME
BACKPLANE
INTERFACE/
ISOLATION
CIRCUITRY
ICS
CIRCUITS
A/D
CONVERTER
)
VOLTAGE
REFERENCE
GND
POT
ADJUST
Figure 10-3. Analog Voltage Input Module Block Diagram for IC693ALG220
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Chapter 10 – Analog Input Modules
10-3
10
IC693ALG220 Analog Input Module Field Wiring Information
The following figure provides information for connecting field wiring to the 4-Channel Analog
Voltage Input module.
a43103
FIELD WIRING
TERMINALS
*
1
2
J
(+)
FIELD WIRING
*
J
3
(+)
4
1
( )
2
5
6
*
*
7
COM
*
8
*
COM
9
GND
10
*
GND
11
12
J
( +)
( )
13
*
J
14
3
( )
(+)
4
15
*
*
COM
GND
J
*
(
16
17
)
*
18
19
20
COM
*
GND
CURRENT INPUT MODE JUMPER
OPTIONAL CONNECTIONS (SEE TEXT)
Figure 10-4. Field Wiring for 4-Channel Analog Voltage Input Module
Note
The (–) side of the voltage source can also be tied to the COM terminal if the
source is floating to limit common-mode voltages. The COM connection
provides access to the common of the analog circuitry in the module. The
GND connection provides access to the baseplate (frame ground).
Please refer to Chapter 2 for wiring and shield ground connection details.
10-4
Series 90-30 PLC I/O Module Specifications – July 2000
GFK-0898F
Analog Input Modules
10
Analog Current Input - 4 Channel
IC693ALG221
The 4-Channel Analog Current Input module for the Series 90-30 Programmable Logic
Controller provides four input channels, each capable of converting an analog input signal to a
digital signal for use as required by your application. This module provides two input ranges.
The default range is 4 to 20 mA with user data scaled so that 4 mA corresponds to a count of 0
and 20 mA corresponds to a count of 32000 with each 1000 counts representing 0.5 mA. When
a jumper is added to the I/O terminal board, the input range is changed to 0 to 20 mA with user
data scaled so that 0 mA corresponds to a count of 0 and 20 mA corresponds to a count of
32000 with each 800 counts representing 0.5 mA. Two range jumpers are provided with the
module; one for channels one and two, and the other for channels three and four.
Conversion speed for each of the four channels is one-half millisecond. This provides an
update rate of two milliseconds for any channel. Resolution of the converted signal is 12 bits
binary (1 part in 4096) over either range. User data in the %AI registers is in 16-bit 2’s
complement format. The placement of the 12 bits from the A/D converter in the %AI data
word is shown below. The relationship between the current input and the data from the A/D
converter is shown in Figures 3-14 and 3-15.
LSB
MSB
X
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X=not applicable to this discussion.
a44654
a44647
4000
4000
A/D
BITS
(decimal)
A/D
BITS
(decimal)
0
0
0
4
20
0
20
CURRENT (mA)
CURRENT (mA)
4 TO 20mA RANGE
0 TO 20mA RANGE
Figure 10-5. A/D Bits vs. Current Input
If the current source is reversed into the input, or is less than the low end of the current range,
then the module will output a data word corresponding to the low end of the current range
(0000H in %AI). If an input that is out of range is entered (that is, it is greater than 20 mA), the
A/D converter will output up to full scale (corresponding to 7FF8H in %AI).
Input scaling is shown in the next figure.
GFK-0898F
Chapter 10 – Analog Input Modules
10-5
10
a44655
a44656
32000
32000
%AI
(decimal)
%AI
(decimal)
0
0
0
4
20
0
CURRENT (mA)
CURRENT (mA)
20
0 TO 20mA RANGE
4 TO 20mA RANGE
Figure 10-6. Scaling for Analog Current Input
Input protection for the module is sufficient to guarantee operation with reduced performance
with up to 200V common-mode. The module provides electrical isolation of externally
generated noise between field wiring and the backplane through the use of optical isolation.
To minimize the capacitive loading and noise, all field connections to the module should be
wired using a good grade of twisted, shielded instrumentation cable. The shields can be
connected to either COM or GND. The COM connection provides access to the common of the
analog circuitry in the module. The GND connection provides access to the baseplate (frame
ground).
An LED at the top of the faceplate is ON when the module’s power supply is operating. The main
power source for the module is the isolated +24 VDC power supplied by the PLC power supply.
This voltage is routed through an inverter/regulator to provide the operating voltage for the module.
This module also consumes power from the +5 VDC output of the PLC power supply to drive the
isolation circuitry. This module can be installed in any I/O slot of a 5 or 10-slot baseplate in a
Series 90-30 PLC system. See page 3-11 to determine the number of Analog Current Input
modules that can be installed in a system.
Table 10-2. Specifications for Analog Current Input Module - IC693ALG221
Input Current Ranges
Calibration
Update Rate
Resolution at 4-20 mA
Resolution at 0-20 mA
Absolute Accuracy [
Common Mode Voltage
Linearity
Isolation
Common Mode Rejection
Cross-Channel Rejection
Input Impedance
Input Filter Response
Internal Power Consumption
4 to 20 mA and 0 to 20 mA
Factory calibrated to 4 µA per count
2 msec (all four channels)
4 µA (1 LSB = 4 µA)
5 µA (1 LSB = 5 µA)
0.1% full scale + 0.1% reading
200 volts
< 1 Least Significant Bit
1500 volts between field side and logic side
> 70 db at DC; >70 db at 60 Hz
> 80 db from DC to 1 kHz
250 ohms
325 Hz
100 mA from the isolated +24 volt supply
25 mA from+5 volt bus on the backplane
Refer to Appendix B for product standards and general specifications.
[ In the presence of severe RF interference (IEC 801-3, 10V/m), accuracy may be degraded to ±0.5% FS.
10-6
Series 90-30 PLC I/O Module Specifications – July 2000
GFK-0898F
Analog Input Modules
10
IC693ALG221 Analog Current Input Block Diagram
The following figure is a block diagram of the 4-Channel Analog Current Input Module.
a44559
RAN1A
PWR
I24V
TRI
2:1
MUX
ANALOG
INPUT
15V
INVERTER
REGULATOR
AND
VOLTAGE
SUPERVISOR
5V
OFFSET
POT ADJUST
5V
RAN2A
F
I
L
T
E
R
DIFFERENTIAL
AMP
FILTERED INPUTS
INA117
AO, AI
RSTB
TIMING
GENERATOR
ICLK
250 Ω
0.5W*
(4 CHANNELS)
F
I
L
T
E
R
15V
IGND
L5V
DUAL
4:1
MUX
VOLT CHANGE
BYSL
RAN1B
WRB
IOCLK
RAN2B
MODE 1
(4 SIGNALS)
POT
15V ADJUST
EN
IODT
ISOLATION
BACKPLANE
INTERFACE
GND
FRAME
GROUND
BUSYB
RSTB
ICLK
BID4
ENAB
BID3
COM
MXCLK
DATA
ICS
CIRCUITS
HIGH
BYTE
LATCH
DATA
A/D
CONVERTER
VREF
VOLTAGE
REFERENCE
SDOT
* = OR MAXIMUM I SPECIFICATION
LGND
Figure 10-7. Analog Current Input Module Block Diagram - IC693ALG221
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Chapter 10 – Analog Input Modules
10-7
10
IC693ALG221 Analog Input Module Field Wiring Information
The following figure provides information for connecting field wiring to the user terminal board
on the 4-Channel Analog Current Input Module.
a44560
FIELD WIRING
TERMINALS
1
2
( +)
FIELD WIRING
0–20MA
CH1/2
*
3
4
CH1
( –)
( + )
CH2
5
6
*
( –)
7
*
COM
GND
*
8
9
10
COM
*
GND
11
12
( +)
0–20MA
CH3/4
*
13
CH3
( – )
14
( +)
16
( –)
15
*
*
COM
GND
CH4
17
*
18
19
20
COM
*
GND
* OPTIONAL CONNECTIONS
Figure 10-8. Field Wiring for 4 Channel Analog Current Input Module
Note
In order to limit common-mode voltages, each current source common line may
also be tied to its associated COM terminal if the source is floating. These
optional connections are shown in the figure above.
Please refer to Chapter 2 for wiring and shield ground connection details.
10-8
Series 90-30 PLC I/O Module Specifications – July 2000
GFK-0898F