Rockwell Automation Publication 1756-RM012B-EN-P - April 2018 75
Create and Use a Safety Add-On Instruction Appendix B
Create an Add-On Instruction
Test Project
You must create a unique test project, specifically to create and test the safety
Add-On Instruction. This project must be a separate and dedicated project to
minimize any unexpected influences.
Follow the guidelines for projects that are described in Create the Project on
page 52.
Create a Safety Add-On
Instruction
For guidance in how to create Add-On Instructions, see the Logix5000
Controllers Add-On Instruction Programming Manual, publication
1756-PM010
.
Generate the Instruction
Signature
The instruction signature lets you quickly determine if the instruction has been
modified. Each Add-On Instruction can have its own signature. The
instruction signature is required when an Add-On Instruction is used in
safety-related functions, and can sometimes be required for regulated
industries. Use it when your application calls for a higher level of integrity.
The instruction signature consists of an ID number and time stamp that
identifies the contents of the Add-On Instruction at a given point in time.
Once generated, the instruction signature seals the Add-On Instruction, which
helps prevent it from being edited while the signature is in place. This
restriction includes rung comments, tag descriptions, and any instruction
documentation that was created. When the instruction is sealed, you can
perform only these actions:
• Copy the instruction signature
• Create or copy a signature history entry
• Create instances of the Add-On Instruction
• Download the instruction
• Remove the instruction signature
• Print reports
When an instruction signature has been generated, the Studio 5000 Logix
Designer application displays the instruction definition with the seal icon.
IMPORTANT If you protect your Add-On Instruction with the source protection feature in
the Studio 5000 Logix Designer application, enable source protection before
you generate the instruction signature.
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