Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 242)

242 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 7 Using SIL 2 Add-On Instructions with 1715 Redundant I/O Modules
If you are using COS, the worst case reaction time from input screw terminal to
output screw terminal is equal to 270 ms plus the following:
– Output RPI
– Add-On Instruction Module RPI/2
– SIL 2 Task Period x 6
– SIL 2 Task Watchdog x 2
Using the Add-On Instruction
Data Tags in an Application
Program
The following illustrations provide basic examples of how the
Requested_Output_Data tag and the Reconciled_Input_Data tag could be used
in program logic. Data is written to the requested output and read from the
reconciled input, while the raw data in the module-defined input and output tags
is ignored.
Figure 68 - Requested_Output_Data in Ladder Logic Example
Figure 69 - Reconciled_Input_Data in Ladder Logic Example