Omron FQM1-MMP21, FQM1-CM001, FQM1-MMA21 operation manual Counter Area, I/O Memory, Appendix B

I/O Memory					Appendix B
	The following table shows when timer PVs and Completion Flags will be reset.
	Instruction	Mode change	FQM1 startup	Operation in jumps	Operation in interlocks
		between		(JMP-JME) or tasks on	(IL-ILC)
		PROGRAM and		standby
		RUN/MONITOR
	TIMER: TIM	PV → 0	PV → 0	PVs refreshed in operat-	PV → SV
		Flag → OFF	Flag → OFF	ing timers	(Reset to SV.)
	HIGH-SPEED TIMER:
	TIMH(015)				Flag → OFF
	ONE-MS TIMER:
	TMHH(540)

Note The present value of TIM, TIMH(015), and TMHH(540) timers programmed will be updated even when jumped between JMP and JME instructions.

Counter Area

The 256 counter numbers (C0000 to C0255) are shared by the CNT and CNTR(012) instructions. Counter Completion Flags and present values (PVs) for these instructions are accessed with the counter numbers.

When a counter number is used in an operand that requires bit data, the counter number accesses the Completion Flag of the counter. When a counter number is used in an operand that requires word data, the counter number accesses the PV of the counter.

Note It is not recommended to use the same counter number in two counter instructions because the counters will not operate correctly if they are counting simultaneously. If two or more counter instructions use the same counter number, an error will be generated during the program check, but the counters will operate as long as the instructions are not executed in the same cycle.

The following table shows when counter PVs and Completion Flags will be reset.

Instruction	Reset	Mode change	FQM1	At reset input	Operation in
		between	startup		interlocks (IL-
		PROGRAM and			ILC)
		RUN/MONITOR
COUNTER: CNT	PV → 0000	Maintained	Reset	Reset	Maintained
	Flag → OFF
REVERSIBLE
COUNTER: CNTR(012)

Counter Completion Flags can be force-set and force-reset.

Counter PVs cannot be force-set or force-reset, although the PVs can be refreshed indirectly by force- setting/resetting the Completion Flag.

There are no restrictions in the order of using counter numbers or in the number of NC or NO conditions that can be programmed. Counter PVs can be read as word data and used in programming.

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