Allen-Bradley 1756-IA8D User Manual

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,
publication 1756-AT016
.
1756-OB16IEF

Allen-Bradley 1756-IA8D Specifications

General

Brand	Allen-Bradley
Model	1756-IA8D
Category	Control Unit
Language	English