Safety Task Execution

The following diagram shows an example of safety task execution in Logix SIS. Each step in the process corresponds to a 1oo1 or 1oo2 safety architecture, which can dynamically transition depending on the current operational state of the system.
Example of Safety Task Execution
Example of Safety Task Execution
Item
Description
Safety
Architecture
A
The unsynchronized primary controller executes the safety task in a 1oo1 configuration.
1oo1
B
The qualification and synchronization process begins between the primary and secondary controllers in the redundant chassis pair.
1oo1
C
Safety data synchronizes between the primary and secondary controllers. The safety function is temporarily muted and cannot respond to safety demands.
1oo1
D
The qualification process finishes, the primary and secondary controllers are synchronized. Both controllers execute the safety task concurrently in a 1oo2 configuration.
1oo2
E
A safety diagnostic detects a fault on the primary controller. The safety function is temporarily muted and cannot respond to safety demands.
1oo1
F
The secondary controller assumes control of the safety task in a 1oo1 configuration.
1oo1
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