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7-11GFK-0787B Chapter 7 Programming Information
GMR Status and Control (%M) References
The GMR system software uses several %M references as status or control bits. Status
bits are used by the GMR software to provide information about GMR operations. These
references can be read as needed by the application program. The control bits can be
used by the application program to provide information to the GMR software.
%M Status References
The following table lists the GMR system status flags.
Reference
Nickname Name Meaning
%M12225 PLCA PLC Ident is A This is PLC A (all GMR bus controllers =31). For
references %M12225, 26, and 27, only one will be
set in each PLC.
%M12226 PLCB PLC Ident is B This is PLC A (all GMR bus controllers =30).
%M12227 PLCC PLC Ident is C This is PLC A (all GMR bus controllers =29).
%M12228 PLCAOK PLC A is online Meaning depends on the PLC where the flag is
set. See the table on the next page.
%M12229 PLCBOK PLC B is online
”
%M12230 PLCCOK PLC C is online
”
%M12231 INHIBIT Inhibit user application Set by the GMR software at startup, to prevent
execution of the application program until data
initialization is complete.
%M12232 MISCMP#* Init. miscompare at
startup
Initializing PLC detects miscompare between
%M (bit) init. data from two online PLCs.
%M12234 SYSFLT#* System fault at startup At startup, communications failure with a GMR
bus controller.
%M12235 SYSFLT System fault Communications failure with a GMR bus con-
troller. This reference is cleared when PLC Fault
Reset is issued.
%M12236 OPDISC O/P discrepancy Output discrepancy. This reference is cleared
when PLC Fault Reset is issued.
%M12237 COLDST* Cold start performed At startup, the initializing PLC detects no other
PLCs online. When the application program
detects this flag has been set, it can initialize any
%M and %R initialization data.
%M12238 IORESIP I/O reset in progress An I/O fault reset is in progress. Bit is On for one
scan when the internal GMR fault tables are
cleared.
%M12239 ATINPRG Autotest in progress An input or output autotest is in progress (not
necessarily initiated by this PLC) the state of this
bit will be the same in all running PLCs.
%M12240 LOGONFT Block logon fault See page 7-17.
%M12241 SIMPLEX Simplex mode One PLC controls the system. •
%M12242 DUPLEX Duplex mode Two PLCs control the system. •
%M12243 TRIPLEX Triplex mode Three PLCs control the system. •
%M12244 IO_SD Any I/O Shutdown
Timer activated
At least one of the PLCs has begun timing an I/O
Shutdown.
%M12245 through %M12256, %M12233 Reserved for future GMR use.
* Will only be set at startup if condition occurs.
Only one of these three will be set at a time.