Allen-Bradley 1756-IT16 - User Manual

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High Resolution Analog I/O Modules

Catalog Numbers 1756-IF8I, 1756-IRT8I, 1756-OF8I, 1756-IR12, 1756-IT16

User Manual

Original Instructions

Main Page

Questions and Answers

J
John WebsterAug 7, 2025
What to do if output is ON in code but not on module in Allen-Bradley I/O Systems?
- P
  patellauraAug 7, 2025
  If the output is ON in your user application code but not ON at the output module, you should: * Verify that at least one of the connections to the output module is active. * Verify that the output is ON in the output module tags. * Confirm whether all of the connections in the chassis are faulted, including the Ethernet modules. If so, troubleshoot the Ethernet communication issue. * Troubleshoot the error code displayed in Module Properties > Connection tab.
A
annewilsonAug 23, 2025
How to fix Allen-Bradley I/O Module Connection Error?
- P
  Patrick LittleAug 23, 2025
  To fix the I/O Module Connection Error or I/O Module Configuration Error (indicated by a yellow triangle in Logix Designer I/O configuration) in Allen-Bradley I/O Systems, you can: * Verify that both entries in the Logix Designer I/O Configuration have the same RPI. * Verify that both entries in the Logix Designer I/O Configuration have the same configuration. * Toggle the Sync_Module_Config BOOL tag in the IO_Mapping Program MainRoutine Rung 1 to copy the module A configuration to module B. * Try removing the module from the chassis and reinserting it. * If the error persists, delete one of the module entries in the Logix Designer I/O Configuration and add it into your project again.

Summary

Important User Information

Chapter 1: Analog I;O Module Operation in the ControlLogix System

Before You Begin

Tasks to complete before installing and using the analog I/O modules.

Ownership

Configure a Module

Outlines the process of configuring an I/O module using the Logix Designer application.

Input Module Operation

Details how analog input modules broadcast data to the backplane independently of polling.

Output Module Operation

Explains how controllers send data to output modules and the role of the RPI in timing.

Chapter 2: Analog I;O Module Features

Scaling

Calibration

Details factory and optional user-executed calibration methods for ensuring module accuracy.

Chapter 3: 1756-IF8 I Isolated Analog Input Module

1756-IF8 I Module Features

Lists key features including Internal Loop Power, Multiple Input Ranges, Notch Filter, and Digital Filter.

Chapter 4: Temperature-sensing Analog Modules

Underrange;Overrange Detection

Process Alarms

Wire Off Detection

Cold Junction Compensation

Accounts for thermoelectric effect at junctions to accurately measure thermocouple temperatures.

Chapter 5: 1756-OF8 I Isolated Analog Output Module

1756-OF8 I Module Features

Lists key features including Multiple Output Ranges, Channel Offset, Ramping, and Clamping.

Ramping;Rate Limiting

Clamping;Limiting

Redundant Owners

Configure the Output Module

Steps to configure output modules for redundant owner applications using Logix Designer.

Chapter 6: Install ControlLogix Analog I;O Modules

Environment and Enclosure

Install the I;O Module

Details the procedure for installing an I/O module into the chassis, including RIUP capabilities.

Key the Removable Terminal Block

Explains how to key the RTB to prevent incorrect wiring connections to the module.

Connect Wiring

Describes how to wire the module using an RTB or a pre-wired Analog Interface Module (AIFM).

Assemble the RTB and the Housing

Install the Removable Terminal Block

Guides on aligning and seating the RTB onto the module for making wiring connections.

Chapter 7: Configure ControlLogix Analog I;O Modules

Create a New Module

Steps to add and define a new analog I/O module within a Logix Designer project environment.

Edit the Configuration

Explains how to modify module configuration settings using various tabs in the New Module dialog.

Connection Tab

Configuration Tab

Calibration Tab

Alarm Configuration Tab

Limit Configuration Tab

Chapter 8: Calibrate the ControlLogix Analog I;O Modules

Calibrate the Input Modules

Details the multi-step process of input calibration using low and high signal references applied to the module.

Calibrate the Temperature-sensing Modules

Covers calibration procedures for RTD and Thermocouple inputs on specific temperature-sensing modules.

Calibrate the Output Module

Explains the calibration process for output modules, focusing on current and voltage output types.

Chapter 9: Troubleshoot Your Module

Status Indicators

Use Logix Designer Application for Troubleshooting

Describes how Logix Designer indicates faults via warning signals and status line messages for troubleshooting.

Fault Type Determination

Troubleshoot Incorrect Readings on the Module

Provides general steps to diagnose and resolve incorrect temperature, current, or voltage readings.

Allen-Bradley 1756-IT16 Specifications

General

Manufacturer	Allen-Bradley
Product Type	Analog Input Module
Series	ControlLogix
Input Channels	16
Number of Inputs	16
Power Dissipation	2.5 W
Backplane Current @ 5VDC	0.5 A
Operating Temperature	0 to 60 °C
Storage Temperature	-40°C to 85°C
Relative Humidity	5 to 95% (non-condensing)
Module Location	ControlLogix Chassis
Weight	0.5kg
Resolution	16 bits
Isolation Voltage	250V (Continuous), 1500V AC (Test Voltage)