Rockwell Automation Publication 1756-UM022D-EN-P - May 2017 49
Configure the Controller Chapter 3
The Logix Designer application creates a safety task and a safety program. A
main ladder logic safety routine called MainRoutine is also created within the
safety program.
Figure 6 - Safety Task in the Controller Organizer
A red bar under the icon distinguishes safety programs and routines from
standard project components in the Controller Organizer.
When a new safety project is created, the Logix Designer application also
automatically creates a time-based safety network number (SNN).
This SNN defines the local chassis backplane as a safety subnet. It can be
viewed and modified via the General tab on the Controller Properties dialog
box.
For most applications, this automatic, time-based SNN is sufficient. However,
there are cases when you need to enter a specific SNN.
Figure 7 - Safety Network Number
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