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Timer and Counter Instructions Section 3-5
Note (1) If the IOM Hold Bit (A500.12) has been turned ON, the status of timer
Completion Flags and PVs will be maintained when the operating mode
is changed.
(2) If the IOM Hold Bit (A500.12) has been turned ON and the status of the
IOM Hold Bit itself is protected in the PLC Setup, the status of timer Com-
pletion Flags and PVs will be maintained even when the power is inter-
rupted.
(3) The PV will be set to the SV when TIMH(015)/TIMHX(551) is executed.
When an operating TIMH(015)/TIMHX(551) timer created with a timer number
between 0 and 15 is in a jumped program section (JMP(004), CJMP(510),
CJPN(511), JME(005)), the timer’s PV will continue timing. (The jumped
TIMH(015)/TIMHX(551) instruction will not be executed, but the PV will be
refreshed every 10 ms and each cycle after all tasks have been executed.)
When TIMH(015)/TIMHX(551) is in a program section between IL(002) and
ILC(003) and the program section is interlocked, the PV will be reset to the SV
and the Completion Flag will be turned OFF.
When a TIMH(015)/TIMHX(551) timer is forced set, its Completion Flag will
be turned ON and its PV will be set to 0. When a TIMH(015)/TIMHX(551)
timer is forced reset, its Completion Flag will be turned OFF and its PV will be
reset to the SV.
The operation of the = Flag and N Flag depends or the model of CPU Unit.
Refer to Flags for details.
The timer’s Completion Flag is refreshed only when TIMH(015)/TIMHX(551)
is executed, so a delay of up to one cycle may be required for the Completion
Flag to be turned ON after the timer times out.
If online editing is used to convert a timer to another kind of timer with the
same timer number (such as TIMH(015)/TIMHX(551)
↔ TIM/TIMX(550) or
TIMH(015)/TIMHX(551)
↔ TMHH(540)/TMHHX(552)), be sure to reset the
Completion Flag. The timer will not operate properly unless the Completion
Flag is reset.
A TIMH(015)/TIMHX(551) instruction’s PV and Completion Flag can be
refreshed in the following ways depending on the timer number that is used.
Timers Created with Timer Numbers T0000 to T0015
Timers Created with Timer Numbers T0016 to T4095
Execution of
TIMH(015)/
TIMHX(551)
The Completion Flag is turned ON if the PV is 0000.
The Completion Flag is turned OFF if the PV is not 0000.
10-ms interval
refreshing
The timer’s PV is updated every 10 ms.
Execution of
TIMH(015)/
TIMHX(551)
The PV is updated every time that TIMH(015) is executed.
The Completion Flag is turned ON if the PV is 0.
The Completion Flag is turned OFF if the PV is not 0.
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