Omron CP - PROGRAMMING MANUAL 05-2007 Programming Manual page 213

Timer and Counter Instructions
Note
180
The Completion Flag is updated only when TMHH(540)/TMHHX(552) is exe-
cuted. The Completion Flag can thus be delayed by up to one cycle time from
the actual set value.
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.
Timers will be reset or paused in the following cases. (When a timer is reset,
its PV is reset to the SV and its Completion Flag is turned OFF.)
Condition
Operating mode changed from RUN or
MONITOR mode to PROGRAM mode or
1
vice versa.
Power supply interrupted and reset
Execution of CNR(545)/CNRX(547), the
RESET TIMER/COUNTER instructions
Operation in interlocked program section
(IL(002)–ILC(003))
Operation in jumped program section
(JMP(004)–JME(005))
(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 TMHH(540)/TMHHX(552) is executed.
When an operating TMHH(540)/TMHHX(552) timer is in a jumped program
section (JMP(004), CJMP(510), CJPN(511), JME(005)), the timer's PV will
continue timing. (The jumped TMHH(540)/TMHHX(552) instruction will not be
executed, but the PV will be refreshed every 1 ms.)
When TMHH(540)/TMHHX(552) 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 TMHH(540)/TMHHX(552) timer is forced set, its Completion Flag will
be turned ON and its PV will be set to 0000. When a TMHH(540)/
TMHHX(552) 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 on the model of the CPU
Unit. Refer to Flags, above, for details.
If online editing is used to convert a timer to another kind of timer with the
same timer number (such as TMHH(540)/TMHHX(552)
TMHH(540)/TMHHX(552)
Completion Flag. The timer will not operate properly unless the Completion
Flag is reset.
PV
0000 OFF
2 0000 OFF
BCD: 9999 OFF
3 Binary: FFFF
Reset to SV. OFF
PV continues Retains previous status.
decrement-
ing.
TIMH(015)/TIMHX(551)), be sure to reset the
Section 3-5
Completion Flag
TIM/TIMX(550) or