Download Analog to Digital Converters

ControlLogix I/O Modules

The ControlLogix PLC is supplied on a 1756 Chassis
Slot “0”
Default
PLC
Slot “9”
ControlLogix I/O Modules


The ControlLogix PLC is supplied on a 1756 Chassis
All cards will begin with the prefix 1756

Cards fit into slots numbered left to right starting with zero
Slot “0”
Slot “9”
ControlLogix I/O Modules


The ControlLogix PLC is supplied on a 1756 Chassis
All cards will begin with the prefix 1756


Cards fit into slots numbered left to right starting with zero
Standard chassis are 4, 7, 10, 13, or 17 slots
Slot “0”
Slot “9”
ControlLogix I/O Modules
Parts Illustration of the ControlLogix I/O Module
Item Description
Backplane Connector - Interface for the ControlLogix system that connects
1
the module to the backplane
Top and Bottom Guides - Guides provide assistance in seating the
2
Removable Terminal Block (RTB) or Interface Module (IMF) cable onto the module
Status Indicators - Indicators display the status of communications, module health,
3
and input/output devices. Indicators help in troubleshooting anomalies.
Connectors Pins - Input/output, power, and grounding connections are made
4
to the module through these pins with the RTB or IFM
Locking Tab - The locking tab anchors the RTB or the IFM cable on the module,
5
maintaining wiring connection
Slots for Keying - Mechanically keys the RTB to prevent inadvertently
6
making the wrong wire connections to your module
ControlLogix I/O Modules
ControlLogix I/O Module IMF Interface
ControlLogix I/O Module RTB
ControlLogix I/O Modules
Analog I/O Modules

The main purpose of a PLC analog module is to
convert signals from:


Continuous to digital
Digital to continuous
Analog I/O Modules

The main purpose of a PLC analog module is to
convert signals from:



Continuous to digital
Digital to continuous
Without these types of modules a computer would not
be able to communicate with the real world.
Analog I/O Modules

Modules that convert an analog signal to a digital
signal are called ADC type devices.


ADC ~ Analog to Digital Converters
ADC devices are input cards.
Analog I/O Modules

Modules that convert an analog signal to a digital
signal are called ADC type devices.



ADC ~ Analog to Digital Converters
ADC devices are input cards.
Modules that convert a digital signal to an analog
signal are called DAC type devices.


DAC ~ Digital to Analog Converters
DAC devices are output cards.
Analog Input Modules

There are many different types of analog input
modules that will interface with different types of
analog sensors:

Thermocouple
 Load Cells
 High Frequency
 RTD (Resistance Temperature Detectors)
Analog Input Modules
Analog Input Modules

Universal Input Module:

Thermocouple
 RTD
 Resistance
 Current
 Voltage
Analog Input Modules

Universal Input Module:
Analog Input Modules

BIT rating of a module:

Input modules have different bit ratings.
Analog Input Modules

BIT rating of a module:


Input modules have different bit ratings.
The bit rating of a card will determine the number of bits
used for one word of memory

One Word = 16 Bits.
Analog Input Modules

BIT rating of a module:


Input modules have different bit ratings.
The bit rating of a card will determine the number of bits
used for one word of memory


One Word = 16 Bits.
The number of bits of a word used will determine how high
the word can count.
Analog Input Modules

BIT rating of a module:


Input modules have different bit ratings.
The bit rating of a card will determine the number of bits
used for one word of memory



The number of bits of a word used will determine how high
the word can count.
Example:




One Word = 16 Bits.
8 Bit card can count up to 28 = 255
12 bit card can count up to 212 = 4095
16 bit card can count up to 216 = 65535
Each count represents a bit.

A 16 bit card can count up to 65536 bits.
Analog Input Modules
BIT rating of a module:
Analog Input Modules

Universal Input Module:

Each terminal where a analog signal can connect to is called
a CHANNEL.
Analog Input Modules

Universal Input Module:


Each terminal where a analog signal can connect to is called
a CHANNEL.
How many channels does this module have?
Analog Input Modules

Universal Input Module:


Single Ended connection.
Differential connection
Analog Input Modules

Lab Input Module:

1756-IF16
Analog Input Modules

Lab Output Module:


1756-OF6CI
Removal under Power
Loads of 0 - 500Ω
Analog Input Modules

Lab Output Module:


1756-OF6CI
Removal under Power
Wire
Moved
Loads of 0 - 1000Ω