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
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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