Rockwell Automation Publication 1756-RM012B-EN-P - April 2018 73
Appendix B
Create and Use a Safety Add-On Instruction
With the Studio 5000 Logix Designer application, you can create safety
Add-On Instructions. Safety Add-On Instructions let you encapsulate
commonly used safety logic into one instruction, which makes it modular and
easier to reuse.
Safety Add-On Instructions use the instruction signature of high-integrity
Add-On Instructions and also a safety instruction signature for use in safety-
related functions up to and including SIL 3.
Figure 20 on page 74
shows the steps that are required to create a safety Add-
On Instruction and then use that instruction in a safety application program.
The shaded items are steps unique to Add-On Instructions. See the links for an
explanation of those topics.
Topic Page
Create an Add-On Instruction Test Project 75
Create a Safety Add-On Instruction 75
Generate the Instruction Signature 75
The Safety Instruction Signature 76
SIL 2 or SIL 3 Add-On Instruction Qualification Test 76
Safety Validate Add-On Instructions 76
Create Signature History Entry 76
Export and Import the Safety Add-On Instruction 76
Verify Safety Add-On Instruction Signatures 77
Test the Application Program 77
Project Validation 77
Safety Assessment 77
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