Omron CJ - INSTRUCTIONS REFERENCE MANUAL 07-2009 Reference Manual page 262

Function
• When the timer input is OFF, the timer specified by N is reset, i.e., the timer's Completion Flag is
turned OFF.
• When the timer input goes from OFF to ON, TIMU(541)/TIMUX(556) starts decrementing the PV. If
the set value is reached while the timer input is ON, the timer's Completion Flag will be turned ON
(the timer times out).
• The status of the timer's 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.
• Read this timer's Completion Flag only. The timer's PV is used by the system, so it cannot be read.
• The setting range for the set value (SV) is 0 to 0.9999 s for TIMU(541) and 0 to 6.5535 s for
TIMUX(556).
• The timer accuracy is -0.1 to 0 ms.
Hint
• A TIMU(541)/TIMUX(556) instruction's Completion Flag is refreshed as shown in the following table.
Execution of TIMU(541)/TIMUX(556)
Precautions
• 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 timer PV cannot be read.
• The Completion Flag is updated only when TIMU(541)/TIMUX(556) is executed. The Completion
Flag can thus be delayed by up to one cycle time from the actual set value.
• The timer will not operate properly when the cycle time exceeds 100 ms.
• 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.)
Operating mode changed from RUN or MONITOR mode to PROGRAM
mode or vice versa. (See note 1.)
Power supply interrupted and reset (See note 2.)
Execution of CNR(545)/CNRX(547), the RESET TIMER/COUNTER
instructions3
Operation in interlocked program section
(IL(002)-ILC(003))
Operation in jumped program section
(JMP(004)-JME(005))
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 Completion Flags and PVs will be maintained even when the power is interrupted.
CS/CJ/NSJ Series Instructions Reference Manual (W474)
The Completion Flag is turned ON if the SV is reached.
The Completion Flag is turned OFF if the SV has not been reached.
Condition Completion Flag
OFF
OFF
OFF
OFF
Retains previous status.
3. Instructions
3
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