User manual

Publication 1756-RM093F-EN-P - January 2010 83
Appendix B
Safety Add-On Instructions
Introduction
With RSLogix 5000 software, version 18 and later, you can create
safety Add-On Instructions. Safety Add-On Instructions let you
encapsulate commonly-used safety logic into a single instruction,
making it modular and easier to reuse.
Safety Add-On Instructions use the instruction signature of
high-integrity Add-On Instructions and also a SIL 3 safety instruction
signature for use in safety-related functions up to and including SIL 3.
Creating and Using a Safety
Add-On Instruction
The flowchart on page 84 shows the steps required for creating a
safety Add-On Instruction and then using that instruction in a SIL 3
safety application program. The shaded items are steps unique to
Add-On Instructions. The items in bold text are explained in the pages
following the flowchart.
Topic Page
Creating and Using a Safety Add-On Instruction 83
Additional Resources 88