Lock the System for Update and Initiate a Locked Switchover
For details about the Lock for Update and Initiate Locked Switchover commands that are used in this procedure, see Initiate System Update Commands in the RMCT.
ATTENTION:
For Logix SIS applications, before you switch control to a secondary controller, verify that the safety project on the secondary controller is the one you intend to execute. You can use the safety signature to verify that the correct safety project is on the controller.
IMPORTANT:
During a lock for update in Logix SIS applications, the safety function is temporarily muted. For muting times, see Safety Function Muting.
IMPORTANT:
Remain offline with your controller while completing this procedure:
- Once you have locked the system, keep the system locked. If you unlock the system during this procedure, the project is cleared from the secondary controller.
- Do not disconnect any communication cables during these steps.
- A locked switchover resets sequential function chart (SFC) instructions to their initial state and causes the SFC instructions to execute twice.
- After the locked switchover, the new secondary controller no longer contains an application and the configuration parameters are reset to the default settings.
To lock the system for update and initiate a switchover, complete these steps.
- Access the RMCT for the redundancy module in the primary chassis.
- On the System Update tab, select Lock for Update.
- When the following message appears, select Yes to begin the system lock process.
- Wait for the system to lock.
- Select Initiate Locked Switchover, and then select Yes.
- Close the RMCT.
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