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Allen Bradley ControlLogix I/O Modules

Input/Output Modules

Choose from digital, analog, RTD, motion, thermocouple, and specialty modules. Further options include field-side diagnostics, individually isolated inputs and/or outputs, and electronic fusing. Each module requires a remote terminal block (RTB).

Your selection process will include not only the I/O requirements of the system but also the characteristics of the modules. Input/Output modules can cover many applications, from high speed digital to process control. By the use of a “producer/consumer” model, the ControlLogix system can share input information and output status with many controllers over the entire system. Some modules feature field-side diagnostics, electronic fusing, and/or individually isolated inputs or outputs. You will need to select a remote terminal block (RTB) or a 1492 interface module (IFM) to connect all field wiring for each module. The following tables list the various input/output module options available.

AC Digital Input Modules

Part NumberInputsVoltage
Category
Operating Voltage
Range
Removable Terminal
Block (RTB)
1756-IA8D8 Diagnostic
(4 points/group)
120 VAC79... 132 VAC1756-TBNH
1756-TBSH
1756-IA1616
(8 points/group)
120 VAC74... 132 VAC1756-TBNH
1756-TBSH
1756-IA16I16 Individually
Isolated
120 VAC74... 132 VAC1756-TBCH
1756-TBS6H
1756-IA3232 Diagnostic
(4 points/group)
120 VAC74... 132 VAC1756-TBCH
1756-TBS6H
1756-IM16I16 Individually
Isolated
240 VAC159... 265 VAC1756-TBCH
1756-TBS6H
1756-IN1616
(8 points/group)
24 VAC10... 30 VAC1756-TBNH
1756-TBSH

AC Digital Output Modules

Part NumberOutputsVoltage
Category
Operating Voltage
Range
Removable Terminal
Block (RTB)
1756-OA88
(4 points/group)
120/240 VAC79... 265 VAC1756-TBNH
1756-TBSH
1756-OA8D8 Diagnostic,
Electronically Fused
(4 points/group)
120 VAC74... 132 VAC1756-TBNH
1756-TBSH
1756-OA8E8 Electronically
Fused (4 points/group)
120 VAC74... 132 VAC1756-TBNH
1756-TBSH
1756-OA1616 Mechanically Fused/
Group (8 points/group)
120/240 VAC74... 265 VAC1756-TBNH
1756-TBSH
1756-OA16I16 Individually
Isolated
120/240 VAC74... 265 VAC1756-TBCH
1756-TBS6H
1756-ON88
(4 points/group)
24 VAC10... 30 VAC, >50mA
16... 30 VAC, <50mA
1756-TBNH
1756-TBSH

DC Digital Input and Output Modules

Allen-Bradley delineates between the various digital DC modules by sorting them into two categories: Sinking and Sourcing. As an engineer designing your own system it will help you to understand the difference between these two options. Here is the definition as given by Allen-Bradley:

"Sinking and Sourcing are terms used to describe a current signal flow relationship between field input and output devices in a control system and their power supply.

  • Field devices connected to the positive side (+V) of the field power supply are sourcing field devices.
  • Field devices connected to the negative side (DC Common) of the field power supply are called sinking field devices.

To maintain electrical compatibility between field devices and the programmable controller system, this definition is extended to the input/output circuits on the digital I/O modules.

  • Sourcing I/O circuits supply (source) current to the sinking field devices.
  • Sinking I/O circuits receive (sink) current from sourcing field devices.

Europe: DC sinking input and sourcing output module circuits are the commonly used options"

DC Digital Input Modules

Part NumberInputsVoltage
Category
Operating Voltage RangeRemovable Terminal Block (RTB)
1756-IB16IF16 High Speed Individually Isolated12/24 VDC
sink/source
10... 30 VDC1756-TBCH
1756-TBS6H
1756-IB1616
(8 points/group)
12/24 VDC
sink
10... 31.2 VDC1756-TBNH
1756-TBSH
1756-IB16D16 Diagnostic
(4 points/group)
12/24 VDC
sink
10... 30 VDC1756-TBCH
1756-TBS6H
1756-IB16I16 Individually
Isolated
12/24 VDC
sink/source
10... 30 VDC1756-TBCH
1756-TBS6H
1756-IB16ISOE16 Individually Isolated,
Sequence of Events
24/48 VDC
sink/source
10... 55 VDC1756-TBCH
1756-TBS6H
1756-IB3232
(16 points/group)
12/24 VDC
sink
10... 31.2 VDC1756-TBCH
1756-TBS6H
1756-IC1616
(8 points/group)
48 VDC
sink
30... 55 VDC @ 60°C
30... 60 VDC @ 55°C
1756-TBNH
1756-TBSH
1756-IG1616
(8 points/group)
5 VDC TTL
source (Low=True)
4.5... 5.5 VDC1756-TBNH
1756-TBSH
1756-IH16I16 Individually
Isolated
125 VDC
sink/source
90... 146 VDC1756-TBCH
1756-TBS6H
1756-IH16ISOE16 Individually Isolated,
Sequence of Events
125 VDC
sink/source
90... 140 VDC1756-TBCH
1756-TBS6H
1756-IV1616
(8 points/group)
12/24 VDC10... 30 VDC1756-TBNH
1756-TBSH
1756-IV3232
(16 points/group)
12/24 VDC10... 30 VDC1756-TBCH
1756-TBS6H

DC Digital Output Modules

Part NumberOutputsVoltage
Category
Operating Voltage
Range
Removable Terminal
Block (RTB)
1756-OB16IEF16 High Speed,
Individually Isolated,
Electronically Fused
24 VDC
sink/source
10... 30 VDC1756-TBCH
1756-TBS6H
1756-OB8812/24 VDC
source
10... 30 VDC1756-TBNH
1756-TBCH
1756-OB8EI8 Individually Isolated,
Electronically Fused
12/24 VDC10... 30 VDC1756-TBNH
1756-TBSH
1756-OB8I8
Individually Isolated
12/24 VDC10... 30 VDC1756-TBCH
1756-TBS6H
1756-OB16D16 Diagnostic
(8 points/group)
24 VDC
source
19.2... 30 VDC1756-TBCH
1756-TBS6H
1756-OB16E16 Electronically Fused
(8 points/group)
12/24 VDC
source
10... 31.2 VDC1756-TBCH
1756-TBS6H
1756-OB16I16 Individually
Isolated
12/24 VDC
sink/source
10... 30 VDC1756-TBCH
1756-TBS6H
1756-OB16IS16 Individually Isolated,
8 Scheduled
12/24 VDC
sink/source
10... 30 VDC1756-TBCH
1756-TBS6H
1756-OB3232
(16 points/group)
12/24 VDC
source
10... 31.2 VDC1756-TBCH
1756-TBS6H
1756-OC88
(4 points/group)
48 VDC
source
30... 60 VDC1756-TBNH
1756-TBSH
1756-OG1616
(8 points/group)
5 VDC TTL
source (Low=True)
4.5... 5.5 VDC1756-TBNH
1756-TBSH
1756-OH8I8
Individually Isolated
120 VDC90... 146 VDC1756-TBCH
1756-TBS6H
1756-OV16E16 Electronically Fused
(8 points/group)
12/24 VDC
sink
10... 30 VDC1756-TBNH
1756-TBSH
1756-OV32E32 Electronically Fused
(16 points/group)
12/24 VDC
sink
10... 30 VDC1756-TBCH
1756-TBS6H

Contact Output Modules

Part NumberOutputsOperating Voltage
Range
Removable Terminal
Block (RTB)
1756-OW16I16 Normally Open
Individually Isolated
5... 150 VDC
10... 265 VAC
1756-TBCH
1756-TBS6H
1756-OX8I8 Normally Open
8 Normally Closed
Individually Isolated
(2 points/group)
5... 150 VDC
10... 265 VAC
1756-TBCH
1756-TBS6H

Analog Input Modules

Part NumberInputsRangeResolutionRemovable Terminal
Block (RTB)
1756-IF6CIS6 Individually Isolated,
Current Sourcing
0... 21 mA16 Bits
0.34 µA/bit
1756-TBNH
1756-TBSH
1756-IF6I6
Individually Isolated
±10.5 V
0... 10.5 V
0... 5.25 V
0... 21 mA
16 Bits
10.5 V: 343 µV/bit
0... 10.5 V: 171 µV/bit
0... 5.25 V: 86 µV/bit
0... 21 mA: 0.34 µA/bit
1756-TBNH
1756-TBSH
1756-IF88 Single-ended,
4 Differential,
2 High Speed Differential
 ±10.25 V
0... 10.25 V
0... 5.125 V
0... 20.5 mA
±10.25 V: 320 µV/cnt(15 bits+)
0... 10.25V: 160 µV/cnt(16 bits)
0... 5.125 V: 80 µV/cnt(16 bits)
0... 20.5 mA: 0.32 µV/cnt(16 bits)
1756-TBCH
1756-TBS6H
1756-IF8H8 Differential, Current or Voltage, HART Interface±10V; 0... 5 V;
1... 5 V; 0... 10 V;
0... 20 mA;
4... 20 mA
16... 21 Bits1756-TBCH
1756-TBS6H
1756-IF1616 Single-ended,
8 Differential or
4 Differential High Speed
±10.5 V
0... 10.5 V
0... 5.25 V
0... 21 mA
16 Bits
10.5 V: 343 µV/bit
0... 10.5 V: 171 µV/bit
0... 5.25 V: 86 µV/bit
0... 21 mA: 0.34 µA/ bit
1756-TBCH
1756-TBS6H
1756-IF16H16 Differential Current,
HART Interface
0... 20 mA
4... 20 mA
16... 21 Bits1756-TBCH
1756-TBS6H
1756-IR6I6 Individually Isolated
RTD
487 Ω
1000 Ω
2000 Ω
4020 Ω
16 Bits
487 Ω: 7.7 mΩ/bit
1000Ω : 15 mΩ/bit
2000 Ω: 30 mΩ/bit
4020 Ω: 60 mΩ/bit
1756-TBNH
1756-TBSH
1756-IT6I6 Individually Isolated
Thermocouple;
1 CJC
-12... 78 mV
-12... 30 mV
16 Bits
-12... 78 mV: 1.4 µV/bit
-12... 30 mV: 0.7 µV/bit
1756-TBNH
1756-TBSH
1756-IT6I26 Individually Isolated
Thermocouple;
2 CJC
-12... 78 mV
-12... 30 mV
(High Resolution Range)
16 Bits
-12... 78 mV: 1.4 µV/bit
-12... 30 mV: 0.7 µV/bit
1756-TBNH
1756-TBSH

Analog Output Modules

Part NumberOutputsRangeResolutionRemovable Terminal
Block (RTB)
1756-OF44
Voltage or Current
±10.4 V
0... 21 mA
Voltage: 15 bits, 320 µV/bit
Current: 15 bits, 650 nA/bit
1756-TBNH
1756-TBSH
1756-OF6CI6 Individually Isolated,
Current
0... 21 mACurrent: 13 bits,
2.7 µA
1756-TBNH
1756-TBSH
1756-OF6VI6 Individually Isolated,
Voltage
±10.5 V21 V: 14 bits, 1.3 mV
10.5 V: 13 bits + sign bit
1756-TBNH
1756-TBSH
1756-OF88
Voltage or Current
±10.4 V
0... 21 mA
10.4 V: 15 bits, 320 µV/bit
21 mA: 15 bits, 650 nA/bit
1756-TBNH
1756-TBSH
1756-OF8H8 Voltage or Current,
HART Interface
±10.4 V
0... 20 mA
4... 20 mA
15... 16 bits1756-TBNH
1756-TBSH

Analog Combination Input/Output Module

Part NumberInputs/OutputsRangeResolutionRemovable Terminal Block (RTB)
1756-IF4FX0F2F4 High Speed,
Sub-millisecond, Differential Inputs;
2 High Speed Voltage
or Current Outputs
Input:
±10.5 V
0... 10.5 V
0... 5.25 V
0... 21 mA
Output:
±10.4 V
0... 21 mA
Input:
Apx. 14 Bits across ±10.5 VDC = 21 V Total, 1.3 mV/bit, 14 bit effective;
0... 10.5 V, 1.3 mV/bit, 13 bit effective;
0... 5.25 V, 1.3 mV/bit, 12 bit effective;
Apx. 12 Bits across 21 mA
0... 21 mA, 5.25 µA/bit
Output:
13 bits across 21 mA = 2.8 µA/bit;
14 bits across 21.8 V = 1.3 mV/bit
1756-TBCH
1756-TBS6H

Specialty Input/Output Modules

Part NumberInputs/OutputsDescriptionRemovable Terminal
Block (RTB)
1756-LSC8XIB8I8... 24 VDC Counters;
8 High Speed 24 VDC Inputs
Low Speed Counter Module
8... 40 kHz 24 VDC Counters;
8 High Speed 24 VDC Auxiliary Inputs
1756-TBCH
1756-TBS6H
1756-CFM4 Inputs – 2 per channel;
2 Outputs – current sourcing
Configurable Flowmeter Module
2 Flowmeter (F) Inputs for all modes;
2 Gate Inputs for Totalizer Mode for
prover/store count
1756-TBNH
1756-TBSH
1756-HSC2 Counters, each with 3 Inputs (A, B, Z for Gate/Reset);
4 Outputs (2 points/group)
High Speed Counter Module
5 V Operation: 4.5... 5.5 VDC;
12/24 V Operation: 10... 31.2 VDC
1756-TBCH
1756-TBS6H
1756-PLSLeft Section: 2 Groups of 4 Outputs/Inputs each;
Center Section: Resolver Interface and I/O Control;
Right Section: 2 Groups of 4 Outputs/Inputs each
Programmable Limit Switch ModuleRequires 3 RTBs:
1756-TBNH
1756-TBSH

HART Smart Instrumentation

HART (Highway Addressable Remote Transmitter) is an industry standard protocol used to connect analog devices. The following interfaces are available for connecting HART devices.

If Your Application:SelectDescription
Has Analog and HART Connectivity in one Module; Needs No External Hardware to Access HART Signal; Can Transmit HART Commands as Unscheduled Messages; Supports Asset Management Software to HART Device1756-IF8H
1756-IF16H
1756-OF8H
Rockwell Automation Analog
I/O Modules
Has Data Acquisition/Control Application With Slow Update Requirements (Such as Tank Farm); Needs No External Hardware to Access HART Signal; Does Not Connect Directly to Asset Management SoftwareMVI56-HARTProsoft Interface
Has Analog and HART in one Module; Has Instrumentation in Hazardous Areas (Flex EX Modules); Can Transmit HART Commands as Unscheduled Messages; Directly Connects Asset Management Software to HART Devices1794FLEX I/O
1797 FLEX Ex I/O
There are Specific FLEX I/O and FLEX Ex Modules for HART Systems. These Catalog Numbers end in H, such as 1797-IE8H

Input/Output Module Accessories

There are two methods of providing wiring connections between the 1756 Input/Output Modules and your plant wiring system: Removable Terminal Blocks (RTBs) and prefabricated wiring cable systems that attach directly to the module. Descriptions of both options are listed below. Note that if you select the RTB option and are using 14 gauge or heavier wire you will need to select an extended depth RTB housing (1756-TBE) for each RTB used.

Removable Terminal Blocks (RTBs)

RTB Part Number1756-TBNH1756-TBSH1756-TBCH1756-TBS6H 
Description20 Position NEMA Screw Clamp RTB20 Pin Spring Clamp RTB/Standard Housing36 Pin Cage Clamp RTB/Standard Housing36 Pin Spring Clamp RTB/Standard Housing 
Screw Torque0.8... 1 N/m
7... 9 lb/in
0.4 N/m
4.4 lb/in
 
Screwdriver Width8 mm – 5/16 in. Maximum

Wiring Cable Systems

Instead of using RTBs and connecting the module wiring on-site you can elect the following wiring system options:

  • Interface Modules (IFMs) provide output terminal blocks for digital input/output modules. You select pre-wired cables matching the digital I/O module to the IFM.
  • Analog Interface Modules (AIFMs) provide output terminal blocks for analog I/O modules. You select pre-wired cables matching the analog I/O module to the AIFM.
  • I/O Module Ready Cables are a prefabricated wiring assembly in which one end is an RTB that plugs directly into the input/output module. The other end of the assembly has color-coded conductors that connect directly to an industry standard terminal block.

 

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