Offline Application Modification with Allowed Application Mismatch

Procedure

To make offline modifications to an application program in either PLC, follow these steps:

Step	Action
1	Modify the application program offline.
2	Perform Build Project and save. NOTE: Do not use the Rebuild All Project option because this causes the Standby CPU to go offline when the application program is downloaded.
3	Verify that the Primary and Standby PLCs are in Run Primary CPU and Run Standby CPU modes.
4	Connect Control Expert to the Primary CPU.
5	Set the Command Register system bit %SW60.3 to 1.
6	Connect Control Expert to the Standby CPU and open the modified program.
7	Download the program and select RUN. NOTE: Check the controller state and ensure that it is in Run Standby mode.
8	Verify that the Primary and Standby PLCs are in Run Primary CPU and Run Standby CPU modes.
9	Perform a Switchover. NOTE: Ensure that the Standby CPU switched to the Primary CPU.
10	Perform an application transfer to the Standby CPU.
11	Set the Command Register system bit %SW60.3 to 0. NOTE: The Command Register system bit is then returned to 0 from 1.

NOTE: For more details, refer to Application Mismatch.

WARNING

UNEXPECTED EQUIPMENT BEHAVIOR

Before transferring a modified application to the Standby CPU:

Examine carefully all the impacts of the modifications on the application.
Check that the modified application does not have adverse effects on the process.

Failure to follow these instructions can result in death, serious injury, or equipment damage.