Allen-Bradley 1756-L61S ControlLogix 5561S, Справочное руководство

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Rockwell Automation Publication 1756-RM093J-EN-P - April 2018 35
CIP Safety and the Safety Network Number Chapter 4
based format is selected, the SNN represents a localized date and time. When the
manual format is selected, the SNN represents a network type and a decimal
value from 1…9999.
Figure 10 - SNN Formats
The assignment of a time-based SNN is automatic when creating a new
GuardLogix safety controller project and adding new Safety I/O modules.
Manual manipulation of an SNN is required in the following situations:
• If safety consumed tags are used.
• If the project will consume safety input data from a module whose
configuration is owned by some other safety device
•
If a safety project is copied to a different hardware installation within the
same routable CIP Safety system
Considerations for Assigning
the Safety Network Number
(SNN) The assignment of the SNN is dependent upon factors including the
configuration of the controller or CIP Safety I/O module.
Safety Network Number (SNN) for Safety Consumed Tags
When a safety controller that contains produced safety tags is added to the I/O
Configuration tree, the SNN of the producing controller must be entered. The
SNN may be copied from the producing controller’s project and pasted into the
new controller being added to the I/O Configuration tree.
Refer to the GuardLogix Controllers User Manual, publication 1756-UM020 , or
the 1768 Compact GuardLogix Controllers User Manual, publication
1768-UM002 , for information on how to copy and paste an SNN.
IMPORTANT
If you assign an SNN manually, take care to make sure that system
expansion does not result in duplication of SNN and node address
combinations.