Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules User Manual
Page 132
132
Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 7
Configure ControlLogix Digital I/O Modules
The tables below describe the communication and connection formats available
for input modules.
Table 26 - Input Module Communication Formats
Communication Format
Data Return
Module
Input Data
Module returns only general fault and input data.
1756-IA16, 1756-IA16I, 1756-IA32,
1756-IB16I, 1756-IB16, 1756-IB32,
1756-IC16, 1756-IG16, 1756-IH16I, 1756-IM16I,
1756-IN16, 1756-IV16, 1756-IV32
CST Timestamped Input Data
Module returns input data with the value of the system clock from its
local chassis when the input data changes.
Rack Optimization
The 1756-CNB module collects all digital input words in the remote
chassis and sends them to the controller as a single rack image. This
connection type limits the status and diagnostic information
available.
Listen Only—Input Data
These formats have the same definition as the similarly-named
options above except that they are Listen-only connections.
Listen Only—CST Timestamped Input Data
Listen Only—Rack Optimization
Full Diagnostic Input Data
Module returns input data, the value of the system clock from its
local chassis when the input data changes, and diagnostic data.
1756-IA8D, 1756-IB16D
Listen Only—Full Diagnostic Input Data
This format has the same definition as Full diagnostic input data
except that it is a Listen-only connection.
1756-IA8D, 1756-IB16D
Table 27 - Input Module Connection Formats
Connection Format
Input Data
Data Return
Module
Data
Timestamp Data
Module returns input data with COS timestamps in CIP Sync system
time. To configure per point timestamping, see
1756-IB16IF
Data
Module returns input data without COS timestamps. This format is
useful when the highest possible throughput is required.
Data with Event
Timestamp Data
Results in two input connections:
• Connection to return input data with COS timestamps in CIP Sync
system time.
• Connection to initiate event tasks. See
.
Listen Only
Timestamp Data
These formats have the same definition as those above except that
they are Listen-only connections.
Data
Listen Only with Event
Timestamp Data