Allen-Bradley 1756-IRT8I User Manual

High Resolution Analog I/O Modules
Catalog Numbers 1756-IF8I, 1756-IRT8I, 1756-OF8I, 1756-IR12, 1756-IT16
User Manual
Original Instructions

Allen-Bradley 1756-IRT8I Specifications

General

Manufacturer	Allen-Bradley
Product Type	I/O Module
Series	ControlLogix
Number of Channels	8
Input Type	RTD/Resistance
Resolution (Temperature)	0.1 °C
Backplane Current @ 24VDC	0 mA
Backplane Current Draw @ 24V	0 mA
Shock (Operating)	30 g
Shock (Nonoperating)	50 g
Resolution	16 bit
Backplane Current @ 5VDC	150 mA
Backplane Current Draw @ 5.1V	150 mA
Operating Temperature	0 to 60 °C
Storage Temperature	-40 to 85 °C (-40 to 185 °F)
Relative Humidity	5 to 95% non-condensing
Vibration	5 g
Certifications	CE, cULus

Summary

High Resolution Analog I/O Modules

Important User Information

Chapter 1 Analog I/O Module Operation in the ControlLogix System

Before You Begin

Input Module Operation

How input modules acquire and broadcast data to the backplane.

Output Module Operation

How output modules receive and echo data to the system.

Configure a Module

Steps to configure I/O modules using the design software.

Requested Packet Interval (RPI)

Parameter defining the broadcast period for input data.

Chapter 2 Analog I/O Module Features

Common Analog I/O Features

Lists common features like CIP Sync, timestamps, and data formats.

Calibration

Methods for calibrating analog I/O modules.

Electronic Keying

Reduces using the wrong device by comparing project definition to installed device.

Relationship between Module Resolution and Scaling

Explains how module resolution and scaling interact to determine data representation.

Scaling

Process of mapping signal values to engineering units.

Module Resolution

The smallest degree of change a module can detect.

Chapter 3 1756-IF8I Isolated Analog Input Module

1756-IF8I Module Features

Lists the specific features of the 1756-IF8I module.

Internal Loop Power Source

Configurable selection for an internal power source on each channel.

1756-IF8I Notch Filter Setting

Lists available Notch Filter settings and minimum RPI rates.

Chapter 4 Temperature-sensing Analog Modules

Common Module Features

Notch Filter

Built-in filter to remove line noise for each channel.

Underrange/Overrange Detection

Detects when input operates beyond set input range limits for temperature modules.

Process Alarms

Alerts when temperature-sensing module exceeds configured limits.

Rate Alarm

Triggers if temperature rate of change exceeds a set point.

Synchronized Sampling

Synchronizes input sampling across multiple modules for simultaneous capture.

Cold Junction Compensation

Compensates for thermoelectric effects at thermocouple junctions.

Digital Filter

Smooths input data noise transients on each channel for temperature modules.

Wire Off Detection

Alerts when wires are disconnected from a temperature-sensing channel.

Chapter 5 1756-OF8I Isolated Analog Output Module

1756-OF8I Module Features

Lists the key features of the 1756-OF8I analog output module, including output types.

Ramping/Rate Limiting

Limits the speed of analog output signal changes to prevent device damage.

Clamping/Limiting

Limits output within configured range, even if controller commands outside range.

Redundant Owners

Lets a single controller use redundant adapters for communication.

Single Controller Behavior

How single controller redundancy affects output ownership and synchronization.

Multiple Controller Behavior

How multiple controllers synchronize behavior for redundancy.

Configure the Output Module

Steps to configure output modules for redundant owner applications.

Response Times for Output Modules

Factors affecting response time for output modules, especially in redundant connections.

Troubleshooting

Common issues like I/O connection or configuration errors.

Issue: Incorrect output behavior on response

Troubleshooting steps for incorrect output behavior or response issues.

Configure 1756-OF8I Redundant Owners

Steps to enable Redundant Ownership mode for the output module.

Chapter 6 Install ControlLogix Analog I/O Modules

Install the I/O Module

Procedure for physically installing an analog I/O module, including RIUP.

North American Hazardous Location Approval

Information for operating equipment in hazardous locations.

ATTENTION: Prevent Electrostatic Discharge

Guidelines for handling equipment to prevent damage from static discharge.

Key the Removable Terminal Block

Process of keying RTBs to prevent incorrect wiring.

Connect Wiring

Instructions for connecting wires to the module using an RTB.

Connect the Grounded End of the Cable

Steps to ground the shield and drain wires of the cable.

Connect the Ungrounded End of the Cable

Steps to connect the insulated wires to the RTB.

Assemble the RTB and the Housing

How to attach the protective housing to the wired RTB.

Install the Removable Terminal Block

Steps for physically installing the RTB onto the module.

Remove the Removable Terminal Block

Steps for safely removing the RTB from the module.

Remove the Module from the Chassis

Steps for safely removing the module from the chassis.

ATTENTION: Environment and Enclosure

Environmental and enclosure requirements for safe operation.

Chapter 7 Configure ControlLogix Analog I/O Modules

Create a New Module

Steps to add a new analog I/O module to a Logix Designer project.

Module Definition

Parameters for defining module series, revision, keying, and connection.

Connection Tab

Tasks on the Connection tab, including RPI, inhibiting, and fault configuration.

Configuration Tab

Module-specific fields for selecting input/output types, ranges, and scaling.

1756-IRT8I Module

Alarm configuration details for the 1756-IRT8I module.

1756-IT16 Module

Calibration Tab

Alarm Configuration Tab

Limit Configuration Tab

Copy Channel Configuration

Edit the Configuration

How to modify module configuration using various tabs.

1756-IR12 Module

Calibration tab details for the 1756-IR12 module.

1756-OF8I Module

1756-IF8I Module

CJ Configuration Tab

Chapter 8 Calibrate the ControlLogix Analog I/O Modules

Calibrate the Output Module

Calibrating the 1756-OF8I module for output types.

Calibrate Via Profile or Ladder

Calibrate the 1756-IF8I Module For Voltage Input Type

Select the channels to be calibrated and click Next.

If channels are OK, click Next.

Calibrate the Temperature-sensing Modules

Calibrate the Module for an RTD Input Type

Connect a 1 Ω precision resistor to all module channels being calibrated.

When the Calibration Completed dialog box appears, click Finish.

Calibrate the Module for a Thermocouple Input Type

Calibrate the 1756-OF8I Module for a Current Output Type

Measure and Record Values

Click Finish.

Calibrate the Input Modules

Input calibration is a multi-step process involving signal references.

On the Calibration tab, click Start Calibration.

Set the calibrator for the low reference and apply it to the module.

Set the calibrator for the high reference voltage and apply it to the module.

Connect a 487 Ω precision resistor to all module channels being calibrated.

Click Next.

Chapter 9 Troubleshoot Your Module

Status Indicators for the 1756-IF8I Module

Status Indicators for the 1756-IRT8I Module

Status Indicators for the 1756-IT16 Module

Use Logix Designer Application for Troubleshooting

Fault Type Determination

Troubleshoot Incorrect Readings on the Module

Table 24 - Troubleshoot Incorrect Temperature Readings

1756-IRT8I and 1756-IR12 Modules - Incorrect RTD Readings

Table 25 - Troubleshoot Incorrect RTD Readings (continued)

1756-IF8I Module - Incorrect Input Voltage/Current Readings

Table 26 - 1756-IF8I Module - Troubleshoot Incorrect Input Voltage/Current Readings

Table 26 - 1756-IF8I Module - Troubleshoot Incorrect Input Voltage/Current Readings (continued)

1756-OF8I Module - Incorrect Output Voltage/Current Readings

Table 27 - 1756-OF8I Module - Troubleshoot Incorrect Input Voltage/Current Readings

1756-IRT8I and 1756-IT16 Modules - Incorrect Temperature Readings

Troubleshooting steps for incorrect temperature readings on specific modules.

Status Indicators for the 1756-IR12 Module

Status Indicators for the 1756-OF8I Module