Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Manual do Utilizador descarregar pdf (Página 20)

Chapter 1 Designing Add-On Instructions

Once generated, the instruction signature seals the Add-On Instruction,

preventing it from being edited while the signature is in place.

In addition, when a sealed safety Add-On Instruction is downloaded for the first

time, a SIL 3 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.

Signature history

The Signature history provides a record of signatures for future reference. A

signature history entry consists of the name of the user, the instruction signature,

the timestamp value, and a user-defined description. Up to six history entries can

be stored. If a seventh entry is made, the oldest entry is automatically deleted.

20 Rockwell Automation Publication 1756-PM010F-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers Add-on Instructions Programm Manual do Utilizador Página 20