Planning your add-on instruction design, Intended behavior – Rockwell Automation Logix5000 Controllers Add-on Instructions Programming Manual User Manual
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Chapter 1
Designing Add-On Instructions
Take time to plan your instruction design. Advance planning can identify issues
that need to be addressed. When defining the requirements of an instruction, you
are also determining the interface. Keep the following aspects in mind when
defining your instruction requirements and creating your Add-On Instruction.
Intended behavior
• What is the purpose for creating the Add-On Instruction?
• What problem is it expected to solve?
• How is it intended to function?
• Do you need to higher level of integrity on your Add-On Instruction?
If so, you can generate an instruction signature as a means to verify that your
Add-On Instruction has not been modified.
• Do you need to use safety application instructions and certify your safety
Add-On Instruction to SIL-3 integrity?
For details on how to certify a safety Add-On Instruction, refer to the
publication
Planning your Add-On
Instruction design
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Rockwell Automation Publication 1756-PM010F-EN-P - October 2014