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6
6-20 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Initialize Data
Next, select System to configure the Initialization Data.
Initialization data, as explained in the PLC Subsystem chapter of this book, is exchanged
between PLCs during startup. It consists of data such as timers and counters and latched logic
states.
It is important to be sure that the memory assignments you make here do not directly
conflict with %R and %M memory used in the application program or required
elsewhere by the GMR software. For more information about memory requirements for
GMR, refer to the Programming chapter.
Enter the rack and slot location for the two bus controllers in the GMR
group that will be exchanging global data. These can be any two bus
controllers in the system, but they must be at the same rack and slot
location in each PLC.
If the PLCs will exchange %M data during startup, enter a starting
reference and length in words. (If the PLCs will not exchange %M data
at startup, enter 0 in the %M length field).
If another PLC is already online during initialization, the initializing PLC
will place %M data received from that PLC into its own %M memory in
this location. If both other PLCs are already online, the initializing PLC
will place data from the PLC with the highest serial bus address into this
%M location.
This %M location can be the same as the %M memory used in the
application program. It is a temporary storage area that is only used at
startup, to store a copy of another PLC’s %M data.
It must begin on a byte boundary (multiple of 8, +1). By default, this
starting reference is %M0001. The default length (next field) is 16.
Enter the length in words for the %M temporary storage area. It should
equal the quantity (in words) of %M memory used in the application
program.
GBC_1
GBC_2
%M Start Ref
%M Length