Allen Bradley ControlLogix I/O Modules Configuration
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 Number | Inputs | Voltage Category | Operating Voltage Range | Removable Terminal Block (RTB) |
| 1756-IA8D | 8 Diagnostic (4 points/group) | 120 VAC | 79... 132 VAC | 1756-TBNH 1756-TBSH |
| 1756-IA16 | 16 (8 points/group) | 120 VAC | 74... 132 VAC | 1756-TBNH 1756-TBSH |
| 1756-IA16I | 16 Individually Isolated | 120 VAC | 74... 132 VAC | 1756-TBCH 1756-TBS6H |
| 1756-IA32 | 32 Diagnostic (4 points/group) | 120 VAC | 74... 132 VAC | 1756-TBCH 1756-TBS6H |
| 1756-IM16I | 16 Individually Isolated | 240 VAC | 159... 265 VAC | 1756-TBCH 1756-TBS6H |
| 1756-IN16 | 16 (8 points/group) | 24 VAC | 10... 30 VAC | 1756-TBNH 1756-TBSH |
AC Digital Output Modules
| Part Number | Outputs | Voltage Category | Operating Voltage Range | Removable Terminal Block (RTB) |
| 1756-OA8 | 8 (4 points/group) | 120/240 VAC | 79... 265 VAC | 1756-TBNH 1756-TBSH |
| 1756-OA8D | 8 Diagnostic, Electronically Fused (4 points/group) | 120 VAC | 74... 132 VAC | 1756-TBNH 1756-TBSH |
| 1756-OA8E | 8 Electronically Fused (4 points/group) | 120 VAC | 74... 132 VAC | 1756-TBNH 1756-TBSH |
| 1756-OA16 | 16 Mechanically Fused/ Group (8 points/group) | 120/240 VAC | 74... 265 VAC | 1756-TBNH 1756-TBSH |
| 1756-OA16I | 16 Individually Isolated | 120/240 VAC | 74... 265 VAC | 1756-TBCH 1756-TBS6H |
| 1756-ON8 | 8 (4 points/group) | 24 VAC | 10... 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 Number | Inputs | Voltage Category | Operating Voltage Range | Removable Terminal Block (RTB) |
| 1756-IB16IF | 16 High Speed Individually Isolated | 12/24 VDC sink/source | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IB16 | 16 (8 points/group) | 12/24 VDC sink | 10... 31.2 VDC | 1756-TBNH 1756-TBSH |
| 1756-IB16D | 16 Diagnostic (4 points/group) | 12/24 VDC sink | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IB16I | 16 Individually Isolated | 12/24 VDC sink/source | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IB16ISOE | 16 Individually Isolated, Sequence of Events | 24/48 VDC sink/source | 10... 55 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IB32 | 32 (16 points/group) | 12/24 VDC sink | 10... 31.2 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IC16 | 16 (8 points/group) | 48 VDC sink | 30... 55 VDC @ 60°C 30... 60 VDC @ 55°C | 1756-TBNH 1756-TBSH |
| 1756-IG16 | 16 (8 points/group) | 5 VDC TTL source (Low=True) | 4.5... 5.5 VDC | 1756-TBNH 1756-TBSH |
| 1756-IH16I | 16 Individually Isolated | 125 VDC sink/source | 90... 146 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IH16ISOE | 16 Individually Isolated, Sequence of Events | 125 VDC sink/source | 90... 140 VDC | 1756-TBCH 1756-TBS6H |
| 1756-IV16 | 16 (8 points/group) | 12/24 VDC | 10... 30 VDC | 1756-TBNH 1756-TBSH |
| 1756-IV32 | 32 (16 points/group) | 12/24 VDC | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
DC Digital Output Modules
| Part Number | Outputs | Voltage Category | Operating Voltage Range | Removable Terminal Block (RTB) |
| 1756-OB16IEF | 16 High Speed, Individually Isolated, Electronically Fused | 24 VDC sink/source | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OB8 | 8 | 12/24 VDC source | 10... 30 VDC | 1756-TBNH 1756-TBCH |
| 1756-OB8EI | 8 Individually Isolated, Electronically Fused | 12/24 VDC | 10... 30 VDC | 1756-TBNH 1756-TBSH |
| 1756-OB8I | 8 Individually Isolated | 12/24 VDC | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OB16D | 16 Diagnostic (8 points/group) | 24 VDC source | 19.2... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OB16E | 16 Electronically Fused (8 points/group) | 12/24 VDC source | 10... 31.2 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OB16I | 16 Individually Isolated | 12/24 VDC sink/source | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OB16IS | 16 Individually Isolated, 8 Scheduled | 12/24 VDC sink/source | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OB32 | 32 (16 points/group) | 12/24 VDC source | 10... 31.2 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OC8 | 8 (4 points/group) | 48 VDC source | 30... 60 VDC | 1756-TBNH 1756-TBSH |
| 1756-OG16 | 16 (8 points/group) | 5 VDC TTL source (Low=True) | 4.5... 5.5 VDC | 1756-TBNH 1756-TBSH |
| 1756-OH8I | 8 Individually Isolated | 120 VDC | 90... 146 VDC | 1756-TBCH 1756-TBS6H |
| 1756-OV16E | 16 Electronically Fused (8 points/group) | 12/24 VDC sink | 10... 30 VDC | 1756-TBNH 1756-TBSH |
| 1756-OV32E | 32 Electronically Fused (16 points/group) | 12/24 VDC sink | 10... 30 VDC | 1756-TBCH 1756-TBS6H |
Contact Output Modules
| Part Number | Outputs | Operating Voltage Range | Removable Terminal Block (RTB) |
| 1756-OW16I | 16 Normally Open Individually Isolated | 5... 150 VDC 10... 265 VAC | 1756-TBCH 1756-TBS6H |
| 1756-OX8I | 8 Normally Open 8 Normally Closed Individually Isolated (2 points/group) | 5... 150 VDC 10... 265 VAC | 1756-TBCH 1756-TBS6H |
Analog Input Modules
| Part Number | Inputs | Range | Resolution | Removable Terminal Block (RTB) |
| 1756-IF6CIS | 6 Individually Isolated, Current Sourcing | 0... 21 mA | 16 Bits 0.34 µA/bit | 1756-TBNH 1756-TBSH |
| 1756-IF6I | 6 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-IF8 | 8 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-IF8H | 8 Differential, Current or Voltage, HART Interface | ±10V; 0... 5 V; 1... 5 V; 0... 10 V; 0... 20 mA; 4... 20 mA | 16... 21 Bits | 1756-TBCH 1756-TBS6H |
| 1756-IF16 | 16 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-IF16H | 16 Differential Current, HART Interface | 0... 20 mA 4... 20 mA | 16... 21 Bits | 1756-TBCH 1756-TBS6H |
| 1756-IR6I | 6 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-IT6I | 6 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-IT6I2 | 6 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 Number | Outputs | Range | Resolution | Removable Terminal Block (RTB) |
| 1756-OF4 | 4 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-OF6CI | 6 Individually Isolated, Current | 0... 21 mA | Current: 13 bits, 2.7 µA | 1756-TBNH 1756-TBSH |
| 1756-OF6VI | 6 Individually Isolated, Voltage | ±10.5 V | 21 V: 14 bits, 1.3 mV 10.5 V: 13 bits + sign bit | 1756-TBNH 1756-TBSH |
| 1756-OF8 | 8 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-OF8H | 8 Voltage or Current, HART Interface | ±10.4 V 0... 20 mA 4... 20 mA | 15... 16 bits | 1756-TBNH 1756-TBSH |
Analog Combination Input/Output Module
| Part Number | Inputs/Outputs | Range | Resolution | Removable Terminal Block (RTB) |
| 1756-IF4FX0F2F | 4 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 Number | Inputs/Outputs | Description | Removable Terminal Block (RTB) |
| 1756-LSC8XIB8I | 8... 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-CFM | 4 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-HSC | 2 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-PLS | Left 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 Module | Requires 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: | Select | Description |
| 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 Device | 1756-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 Software | MVI56-HART | Prosoft 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 Devices | 1794FLEX 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 Number | 1756-TBNH | 1756-TBSH | 1756-TBCH | 1756-TBS6H | |
| Description | 20 Position NEMA Screw Clamp RTB | 20 Pin Spring Clamp RTB/Standard Housing | 36 Pin Cage Clamp RTB/Standard Housing | 36 Pin Spring Clamp RTB/Standard Housing | |
| Screw Torque | 0.8... 1 N/m 7... 9 lb/in | 0.4 N/m 4.4 lb/in | |||
| Screwdriver Width | 8 mm – 5/16 in. Maximum | ||||
Wiring Cable Systems
Instead of using RTBs and connecting the module wiring on-site yo 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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