User manual

Publication 1756-RM093F-EN-P - January 2010 87
Safety Add-On Instructions Appendix B
Safety Validate Add-On Instructions
An independent, third-party review of the safety Add-On Instruction
may be required before the instruction is approved for use. An
independent, third-party validation is required for IEC 61508 SIL 3.
Create Signature History Entry
The signature history provides a record for future reference. A
signature history entry consists of the instruction signature, the name
of the user, the timestamp value, and a user-defined description. Up
to six history entries may be stored. You must be offline to create a
signature history entry.
Export and Import the Safety Add-On Instruction
When you export a safety Add-On Instruction, choose the option to
include all referenced Add-On Instructions and User-Defined 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
project.
• You cannot import a safety Add-On Instruction into a safety
project that has been safety-locked or one that has a safety task
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 Types are not available, you may need to remove
the signature.
TIP
The Signature Listing report in RSLogix 5000 software prints
the instruction signature, the timestamp, and the safety
instruction signature. Print the report by right-clicking Add-On
Instruction in the Controller Organizer and choosing
Print>Signature Listing.