Omron CJ1G-CPUxx, Instructions Manual

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Timer and Counter Instructions Section 3-6
Description When the timer input is OFF, the timer specified by N is reset, i.e., the timer’s
PV is reset to the SV and its Completion Flag is turned OFF.
When the timer input goes from OFF to ON, TIM/TIMX(550) starts decrement-
ing the PV. The PV will continue timing down as long as the timer input
remains ON and the timer’s Completion Flag will be turned ON when the PV
reaches 0000.
The status of the timer’s PV and Completion Flag will be maintained after the
timer times out. To restart the timer, the timer input must be turned OFF and
then ON again or the timer’s PV must be changed to a non-zero value (by
MOV(021), for example).
The following timing chart shows the behavior of the timer’s PV and Comple-
tion Flag when the timer input is turned OFF before the timer times out.
Flags
Note In CS1 and CJ1 CPU Units, these are turned OFF.
In CS1-H, CJ1-H, CJ1M, and CS1D CPU Units, these Flags are left
unchanged.
Precautions Timer numbers are shared by the TIM, TIMX(550), TIMH(015), TIMHX(551),
TMHH(540), TMHHX(552), TTIM(087), TTIMX(555), TIMW(813),
TIMWX(816), TMHW(815), and TMHWX(817) instructions. If two timers share
the same timer number, but are not used simultaneously, a duplication error
will be generated when the program is checked, but the timers will operate
normally. Timers which share the same timer number will not operate properly
if they are used simultaneously.
Timers created with timer numbers 2048 to 4095 will not operate properly
when the CPU Unit cycle time exceeds 80 ms. Use timer numbers 0000 to
2047 when the cycle time is longer than 80 ms.
The present value of timers programmed with timer numbers 0000 to 2047 will
be updated even when the timer is on standby. The present value of timers
programmed with timer numbers 2048 to 4095 will be held when the timer is
on standby.
Timer input
Timer PV
SV
Completion
Flag
Timer input
Timer PV
SV
Completion
Flag
Name Label Operation
Error Flag ER ON if N is indirectly addressed through an Index Register
but the address in the Index Register is not the PV
address of a timer.
ON if in BCD mode and S does not contain BCD data.
OFF in all other cases.
Equals Flag = OFF or unchanged (See note.)
Negative Flag N OFF or unchanged (See note.)