104 Rockwell Automation Publication 1756-RM093J-EN-P - April 2018
Appendix G Using 1794 FLEX™ I/O Modules and 1756 SIL 2 Inputs and Outputs with 1756 GuardLogix Controllers to Comply with EN 50156
SIL 2 Input Data
Keep channel A and
channel B input data
separate at all times. This
example illustrates one
method for separating
channel A and channel B
data in your application.
Any logic processing that
needs to occur must follow
ControlLogix SIL 2
guidelines.
• Follow all rules for 1756 I/O modules as defined in the Using
ControlLogix in SIL 2 Applications Safety Reference Manual, publication
1756-RM001
.
• Follow all rules for 1794 FLEX™ I/O modules as defined in the
FLEX™ I/O System with ControlLogix for SIL 2 Safety Reference
Manual, publication 1794-RM001
.
Transferring SIL 2 Data Into the Safety Task
To transfer channel A and channel B SIL 2 safety data into the GuardLogix®
safety task, use the safety tag mapping functionality in RSLogix 5000® software.
The tag names used here are for example purposes. Implement and follow naming
conventions that are appropriate for your application.
Do not perform safety-specific functions within these routines. Safety
evaluation must be handled within the 1756 GuardLogix safety task.
To use the safety tag mapping feature, select Map Safety Tags from the
Logic menu in RSLogix 5000 software.
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