Allen-Bradley 1756-IF8I User Manual

20 Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
Chapter 1 Analog I/O Module Operation in the ControlLogix System
Listen-only Mode
Any controller in the system can listen to the data from any I/O module, that is,
input data or echoed output data, even if the controller does not own the module.
During the I/O configuration process, you can specify a Listen-Only connection.
For more information on Connection options when configuring your system, see
page 130
.
When you choose a Listen-Only connection, the controller and module establish
communication without the configuration data being sent by the controller. In
this instance, another controller owns the I/O module.
IMPORTANT
The Listen-Only controller receives data from the I/O module as long as an
owning connection between a controller and I/O module is maintained.
If the connection between all owner-controllers and the module is broken,
the module stops sending data and connections to all `Listening
controllers’ are also broken.
In addition, multicast Listen Only connections require at least one multicast
owning connection to be active.

Allen-Bradley 1756-IF8I Specifications

General

Category	I/O Systems
Manufacturer	Allen-Bradley
Module Type	Analog Input Module
Number of Inputs	8
Resolution	16 bits
Backplane Current @ 24VDC	30 mA
Power Dissipation	1.2 W
Voltage Input Range	0 to 10V, -10 to 10V
Current Input Range	0-20mA, 4-20mA
Module Location	Any slot in the chassis
Operating Temperature	0 to 60 °C