Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules - Manual (Page 50)

50 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 3 Common Module Features
Producer/Consumer Communication
By using Producer/Consumer communication, ControlLogix I/O modules can
produce data without first being polled by a controller. The modules produce the
data and any other owner-controller device can decide to consume it.
For example, an input module produces data and any number of processors can
consume the data at the same time. This eliminates the need for one processor to
send the data to another processor. For more information about this process, see
Input Module Operation on page 26 .
Status Indicator Information
Each ControlLogix digital I/O module has a status indicator on the front of the
module that lets you check the health and operational status of a module. The
status indicator displays vary for each module.
See Appendix A for examples of status indicators on ControlLogix digital I/O
modules.
Common Features
Specific to Input Modules The table below lists features specific to ControlLogix digital input modules.
Status Description
I/O status
ST This yellow display indicates the On/Off state of the field device.
IMPORTANT: For the 1756-OA8D and 1756-OA8E modules, the I/O status indicator does not
illuminate without field power applied.
Module status
OK This green display indicates the module’s communication status.
Fault status
FLT This display is only found on some modules and indicates the presence or absence of various
faults.
Fuse status
Fuse This display is only found on electronically fused modules and indicates the state of the
module’s fuse.
Topic Page
Data Transfer on Either Cyclic Time or Change of State 51
Set RPI 51
Enable Change of State 52
Software Configurable Filter Times 53
Isolated and Nonisolated Varieties of Input Modules 53
Multiple Input Point Densities 54