Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 295

Timer and Counter Instructions
Flags
Precautions
Note
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).
Name
Error Flag ER
Equals Flag =
Negative Flag N
Note In CS1-H, CJ1-H, CJ1M, and CS1D (for Single-CPU System) CPU Units,
these Flags are left unchanged.
In CS1 and CJ1 CPU Units, these are turned OFF.
Timer numbers are shared with other timer 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.
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 a high-speed timer with a timer number from 0 to 15 will
be refreshed even if the task is on standby. The present value of a high-speed
timer with a timer number from 16 to 4095 will be held if the task 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 (A50012) has been turned ON, the status of timer Com-
pletion Flags and PVs will be maintained when the operating mode is
changed.
2. If the IOM Hold Bit (A50012) has been turned ON and the status of the IOM
Hold Bit itself is protected in the PLC Setup, the status of timer Completion
Flags and PVs will be maintained even when the power is interrupted.
3. The PV will be set to the SV when TMHH(540)/TMHHX(552) is executed.
Label
ON if N is indirectly addressed through an Index Register
but the address in the Index Register is not the address of
a timer Completion Flag or timer PV.
ON if in BCD mode and S does not contain BCD data.
OFF in all other cases.
Unchanged (See note.)
Unchanged (See note.)
0000
2
0000
BCD: 9999
3
Binary: FFFF
Reset to SV.
PV continues
decrement-
ing.
Section 3-6
Operation
PV Completion Flag
OFF
OFF
OFF
OFF
Retains previous status.
255