Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules - Manual (Page 194)

194 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Appendix B Tag Definitions
Fast Output Module Tags ControlLogix fast output modules have three types of tags:
• Configuration— Structure of data sent from the controller to the I/O
module upon powerup.
• Input— Structure of data continually sent from the I/O module to the
controller containing the current operational status of the module.
• Output— Structure of data continually sent from the controller to the I/O
module that can modify the module behavior.
1756-OB16IEF Module
The 1756-OB16IEF module uses array data structures. Array data structures
differ from the flat data structures of other digital I/O modules. For more
information, see
Array Data Structures on page 211 .
IMPORTANT The Module Definition column in each table lists the connection type and input
data type combinations that are required to create the corresponding tag. For
more information about defining connection and input data types, see
Create a
New Module on page 129 .
Topic Page
1756-OB16IEF Module 194
1756-OB16IEFS Module 202
IMPORTANT In RSLogix 5000 software, version 18.02.00 and 19.01.00, output tag
information is sent to the 1756-OB16IEF module only at the RPI rate defined
during configuration. For optimal performance, use an Immediate Output (IOT)
instruction.
For example, the rung shown below contains an IOT instruction for a fast
output module in slot 3. Add a similar rung to your last routine within the Main
Task to mimic normal output tag processing.