Program Logic to Run After a Switchover
If your application requires logic or instructions to execute after a switchover, use programming and tags similar to the values shown in this ladder logic example.
Precondition Used to Run Logic After Switchover
Item | Description |
|---|---|
A | The GSV instruction obtains the chassis ID of the primary chassis in control. |
B | If this is the first program scan, then use the current primary chassis ID as the chassis ID for the last scan. |
C | If a switchover occurs, the chassis ID changes. The NEQ instruction compares the current and last primary chassis ID values. If the values are different, the Switchover_Occurred bit is turned on. Also, the current primary chassis ID is moved into the last chassis ID. |
D | If the Switchover_Occurred bit is on, then the instructions added to this rung are executed and the Switchover_Occurred bit is reset. |
E | Add your switchover-dependent instructions here. |
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