Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules User Manual
Page 133
Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
133
Configure ControlLogix Digital I/O Modules
Chapter 7
The tables below describe the communication and connection formats available
for output modules.
Table 28 - Output Module Communication Formats
Communication Format
Data Return
Module
Output Data
The owner-controller sends the module only output data.
1756-OA8, 1756-OA16I, 1756-OB8, 1756-OB8I,
1756-OB16I, 1756-OB16IS
(1)
,
1756-OB32, 1756-OC8, 1756-OG16,
1756-OH8I, 1756-ON8, 1756-OW16I, 1756-OX8I
Scheduled Output Data
The owner-controller sends the module output data and a CST
timestamp value
Rack Optimization
The owner-controller sends all digital output words to the remote
chassis as a single rack image.
Listen Only—Output Data
These formats have the same definition as those above except that
they are Listen-only connections.
Listen Only—Rack Optimization
CST Timestamped Fuse Data—Output Data
The owner-controller sends the module only output data. The
module returns fuse blown status with the value of the system clock
(from its local chassis) when the fuse is either blown or reset.
1756-OA16, 1756-OA8E, 1756-OB16E, 1756-
OB8EI, 1756-OV16E, 1756-OV32E
CST Timestamped Fuse Data—Scheduled Output Data
The owner-controller sends the module output data and a CST
timestamp value. The module returns fuse blown status with the
value of the system clock (from its local chassis) when the fuse is
either blown or reset.
Listen Only - CST Timestamped Fuse Data—Output Data This choice has the same definition as CST timestamped fuse data -
output data except that it is a Listen-only connection.
Full Diagnostics—Output Data
The owner-controller sends the module only output data. The
module returns diagnostic data and a timestamp of diagnostics.
1756-OA8D, 1756-OB16D
Full Diagnostics—Scheduled Output Data
The owner-controller sends the module output data and a CST
timestamp value. The module returns diagnostic data and a
timestamp of diagnostics.
Listen Only—Full Diagnostics—Output Data
This format has the same definition as Full diagnostics - output data
except that it is a Listen-only connection.
Scheduled Output Data per Point
The owner-controller sends the module output data and a CST
timestamp value.
1756-OB16IS only
(1) The 1756-OB16IS module does not support the Rack optimization, Listen only—rack optimization and Scheduled output data communication formats.
Table 29 - Output Module Connection Formats
Connection Format
Output Data
Data Return
Module
Data
Data
The owner-controller sends the module only output data.
1756-OB16IEF, 1756-OB16IEFS
Scheduled Per Module
The owner-controller sends the module output data and a CIP Sync
timestamp value.
1756-OB16IEF
Scheduled Per Point
The owner-controller sends output data and a CIP Sync timestamp
value to points configured for scheduling.
1756-OB16IEFS
Listen Only
None
Establishes a Listen-only connection with no data.
1756-OB16IEF, 1756-OB16IEFS
Peer Input with Data
Data with Peer
Establishes a Listen-only connection to input peer modules.
See the Peer Ownership Application Technique,
publicat
1756-OB16IEF