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7-31GFK-0787B Chapter 7 Programming Information
Storing a Program to the PLC
All redundant PLCs in the GMR system must use the same application program, but
different configurations:
PLC A
PLC B PLC C
Program: GMRPROG
Configuration: CONFIGA
Program: GMRPROG
Configuration: CONFIGB
Program: GMRPROG
Configuration: CONFIGC
Supplying the configuration and program as separate files, as shown above, makes it
easier to perform program updates in the future.
Note: The method used for storing a program depends on whether the system has been
configured to permit online changes.
If online changes are NOT permitted, the process shuts down all PLCs.
If online changes ARE permitted, a program can be stored without shutting down
the PLCs. This method requires extreme caution.
It is important to match the configuration to the method (described on the following
pages) you will be using. Regardless of which method you use, the system will be shut
down unless the GMR configuration has online changes enabled. Configuration for
online changes is described on page 6-15.