Omron SYSMAC CS Series Instruction & Reference Manual page 169

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.
• Timers created with timer numbers 2048 to 4095 will not operate properly when the CPU Unit cycle
time exceeds 100 ms. Use timer numbers 0 to 2047 when the cycle time is longer than 100 ms.
• The present value of timers programmed with timer numbers 0 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 vice versa.*
2
Power off 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 main-
tained 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 off. How-
ever, timing is not continued after power is restored. If the timer input to the instruction is turned ON when
power is restored, continuous operation will not be performed.
*3 The PV will be set to the SV when TIM/TIMX(550) is executed.
• When TIM/TIMX(550) 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 an operating TIM/TIMX(550) timer created with a timer number between 0000 and 2047 is in a
jumped program section (JMP(004), CJMP(510), CJPN(511), JME(005)), the timer's PV will continue
timing. (See note.) The jumped TIM/TIMX(550) instruction will not be executed, but the PV will be
refreshed each cycle after all tasks have been executed.
Note With the CS1D CPU Units, the PV will not be refreshed in the above case.
• When a TIM/TIMX(550) timer is forced set, its Completion Flag will be turned ON and its PV will be
set to 0000. When a TIM/TIMX(550) timer is forced reset, its Completion Flag will be turned OFF and
its PV will be reset to the SV.
• The timer's Completion Flag is refreshed only when TIM/TIMX(550) 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 overwrite a timer instruction, always reset the Completion Flag. The timer
will not operate properly unless the Completion Flag is reset.
• The following restrictions apply if Synchronous Unit Operation is used with a CJ2H-CPU6@-(EIP)
CPU Unit or if the internal pulse control period is set to 1 ms for a CJ2M-CPU@@CPU Unit with unit
version 2.0 or later.
• An error of up to one cycle time will occur in the timer PV accuracy.
• The timers will not operate correctly if the cycle time exceeds 100 ms.
• If an TIM/TIMX instruction is in a task that is stopped or is not executed because it is jumped by a
JMP(004), CJMP(510), or CJPN(511) instruction, the timer will not operate correctly.
CS/CJ/NSJ Series Instructions Reference Manual (W474)
0
1
0
BCD: 9999
3 Binary: FFFF
Reset to SV.
PV continues
decrementing.
PV Completion Flag
OFF
OFF
OFF
OFF
Retains previous
status.
3. Instructions
3
135