424
Timer Area Section 9-13
PV of the timer. Timer Completion Flags can be used as often as necessary
as normally open and normally closed conditions and the values of timer PVs
can be read as normal word data.
With CJ1-H and CJ1M CPU Units, the refresh method for timer PVs can be
set from the CX-Programmer to either BCD or binary. With CJ1 CPU Units, it
can only be set to binary.
Note It is not recommended to use the same timer number in two timer instructions
because the timers will not operate correctly if they are timing simultaneously.
(If two or more timer instructions use the same timer number, an error will be
generated during the program check, but the timers will operate as long as the
instructions are not executed in the same cycle.)
The following table shows when timer PVs and Completion Flags will be reset.
Note 1. If the IOM Hold BIt (A50012) is ON, the PV and Completion Flag will be
retained when a fatal error occurs or the operating mode is changed from
PROGRAM mode to RUN or MONITOR mode or vice-versa. The PV and
Completion Flag will be cleared when power is cycled.
2. If the IOM Hold BIt (A50012) is ON and the PLC Setup’s “IOM Hold Bit Sta-
tus at Startup” setting is set to protect the IOM Hold Bit, the PV and Com-
pletion Flag will be retained when the PLC’s power is cycled.
3. Since the TIML(542), TIMLX(553), MTIM(543), and MTIMX(554) instruc-
tions do not use timer numbers, they are reset under different conditions.
Refer to the descriptions of these instructions for details.
4. The present value of HUNDRED-MS TIMER (TIM/TIMX(550)), TEN-MS
TIMER (TIMH(015)/TIMHX(551)), ONE-MS TIMER (TMHH(540)/TMH-
HX(552)), TENTH-MS TIMER (TIMU(541)/TIMUX(556) (see note), HUN-
DREDTH-MS TIMER (TMUH(544)/TMUHX(557)) (see note), TIMER
WAIT (TIMW(813)/TIMWX(816), and HIGH-SPEED TIMER WAIT (TM-
HW(815)/TMHWX(817)) timers programmed with timer numbers 0000 to
2047 will be updated even when jumped between JMP and JME instruc-
tions or when in a task that is on standby. The present value of timers pro-
Instruction name Effect on PV and Completion Flag Operation in
Jumps and Interlocks
Mode change
1
PLC start-up
1
CNR(545)/
CNRX(547)
Jumps
(JMP-JME) or
Tasks on standby
Interlocks
(IL-ILC)
HUNDRED-MS TIMER:
TIM/TIMX(550)
PV → 0
Flag → OFF
PV → 0
Flag → OFF
PV → 9999
Flag → OFF
PVs refreshed in
operating timers
PV → SV
(Reset to SV.)
Flag → OFF
TEN-MS TIMER:
TIMH(015)/TIMHX(551)
ONE-MS TIMER:
TMHH(540)/TMHHX(552)
TENTH-MS TIMER:
TIMU(541)/TIMUX(556)
(See note 5.)
HUNDERDTH-MS TIMER:
TMUH(544)/TMUHX(557)
(See note 5.)
ACCUMULATIVE TIMER:
TTIM(087)/TTIMX(555)
PV Maintained PV Maintained
TIMER WAIT:
TIMW(813)TIMWX(816)
PVs refreshed in
operating timers
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HIGH-SPEED TIMER WAIT:
TMHW(815)/TMHWX(817)
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