Online or Offline Modifications and Application Mismatch
Original instructions
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Modifying Application Programs
Normally, once a fault-tolerant redundant system is configured, programmed, and controlling its process, the system is not shut down, not even for periodic maintenance. However, there may be situations when you may need to make modifications to the application program and continue to control the process.
The Application Mismatch feature allows you to modify application programs online or offline while controlling the process.
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.