GE GFK-0787B user manual GMR Status and Control %M References, Status References

7

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	º
%M12230	PLCCOK	PLC C is online	º
%M12231	INHIBIT	Inhibituserapplication	Set by the GMR software at startup, to prevent
			execution of the application program until data
			initializationiscomplete.
%M12232	MISCMP#*	Init.miscompareat	InitializingPLCdetectsmiscomparebetween
		startup	%M (bit) init. data from two online PLCs.
%M12234	SYSFLT#*	System fault at startup	At startup, communications failure with a GMR
			buscontroller.
%M12235	SYSFLT	Systemfault	Communications failure with a GMR bus con-
			troller. This reference is cleared when PLC Fault
			Reset is issued.
%M12236	OPDISC	O/Pdiscrepancy	Outputdiscrepancy. 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/Oresetinprogress	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 runningPLCs.
%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	AnyI/OShutdown	At least one of the PLCs has begun timing an I/O
		Timeractivated	Shutdown.
%M12245 through %M12256, %M12233			Reserved for future GMR use.

*Will only be set at startup if condition occurs. D Only one of these three will be set at a time.

GFK-0787B Chapter 7 Programming Information 7-11