Rockwell Automation Publication 1756-UM013B-EN-P - October 2019 83
Configure and Replace Safety Modules Chapter 5
General Category
The General category appears first when you create a module. The parameters in
this category are the same for all 1756 ControlLogix digital safety I/O modules.
You use this category to complete the following tasks:
• Name the module.
• Assign a node number.
• Describe the module.
• Access the Module Definition.
Safety Network Number
The Logix Designer application automatically assigns a Safety Network Number
(SNN) to safety modules as they are added to the project.
The SNN is a time-based number that uniquely identifies subnets across all
networks in the safety system. All 1756 ControlLogix digital safety I/O modules
in the same subnet use the same SNN by default.
• Local 1756 ControlLogix digital safety I/O modules are automatically
assigned the same SNN as the 1756 Backplane SSN in the controller
configuration.
• Remote 1756 ControlLogix digital safety I/O modules are automatically
assigned the same SNN.
The Logix Designer application assigns an SNN to the first safety module
that is added to a remote system. The application assigns the same SNN to
additional safety modules that are added to this remote I/O system.
For more information on Safety Network Numbers, see the GuardLogix 5580
and Compact GuardLogix 5380 Controller Systems Safety Reference Manual,
publication 1756-RM012.
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