The Safety Instruction Signature; Sil 2 Or Sil 3 Add-On Instruction Qualification Test; Safety Validate Add-On Instructions; Create Signature History Entry - Allen-Bradley GuardLogix 5580 Original Instructions Manual

Appendix B Create and Use a Safety Add-On Instruction
The Safety Instruction
Signature
SIL 2 or SIL 3 Add-On
Instruction Qualification Test
Safety Validate Add-On
Instructions
Create Signature History
Entry
Export and Import the Safety
Add-On Instruction
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When a sealed safety Add-On Instruction is downloaded for the first time, a
safety instruction signature is automatically generated. The safety instruction
signature is an ID number that identifies the execution characteristics of the
safety Add-On Instruction.
Safety Add-On Instruction tests must be performed in a separate, dedicated
application to verify that unintended influences are minimized. You must
follow a well-designed test plan and perform a unit test of the safety Add-On
Instruction that exercises all possible execution paths through the logic,
including the valid and invalid ranges of all input parameters.
An independent, third-party review of the safety Add-On Instruction can be
required before the instruction is approved for use. An independent, third-
party validation may be required for functional safety certification.
The signature history provides a record for future reference. A signature
history entry consists of the instruction signature, the name of the user, the
time stamp value, and a user-defined description. Up to six history entries can
be stored. You must be offline to create a signature history entry.
TIP The Signature Listing report in the Studio 5000 Logix Designer application prints
the instruction signature, the time stamp, and the safety instruction signature. To
print the report, right-click Add-On Instruction in the Controller Organizer and
choose Print>Signature Listing.
When you export a safety Add-On Instruction, choose the option to include
all referenced Add-On Instructions and user-defined data types in the same
export file. By including referenced Add-On Instructions, you make it easier to
preserve the signatures.
When importing Add-On Instructions, consider these guidelines:
• You cannot import a safety Add-On Instruction into a standard
controller project.
• You cannot import a safety Add-On Instruction into a safety controller
project that has been safety-locked or one that has a safety signature.
• You cannot import a safety Add-On Instruction while online.
• If you import an Add-On Instruction with an instruction signature into
a project where referenced Add-On Instructions or user-defined data
types are not available, you may need to remove the signature.
For more information, see the Import/Export Project Components
Programming Manual, publication 1756-PM019.
Rockwell Automation Publication 1756-RM012B-EN-P - April 2018