Safety Signature Hierarchy

The following image shows an example of the safety signature hierarchy:
  • A signature with ID and time stamp exists for each element in the hierarchy.
  • Expand the safety signature at the top to view its underlying elements.
  • Expand a parent element to view its underlying child elements.
Safety Signature Hierarchy
Safety Signature Hierarchy
Item
Description
A
Safety signature
B
Safety signature elements

Aggregate Signatures

Safety elements that include a collection of tags and parameters have aggregate signatures. An aggregate signature represents the validity of all tags and parameters within the element.
The following elements have aggregate signatures:
  • Controller-scoped safety tags
  • Safety program parameters and tags
  • Safety Add-On Instructions
  • Safety mapped tags
  • Safety I/O connections
If one of the preceding elements has a collection with no members, such as no controller-scoped safety tags, the aggregate signature value appears as 64 zeros.
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