247
Timer and Counter Instructions Section 3-6
Flags
Note In CS1 and CJ1 CPU Units, these are turned OFF.
In CS1-H, CJ1-H, CJ1M, and CS1D CPU Units, these Flags are left
unchanged.
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 80 ms. Use timer numbers 0000 to
2047 when the cycle time is longer than 80 ms.
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.)
Note 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 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
Name Label Operation
Error Flag ER 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.
Equals Flag = OFF or unchanged (See note.)
Negative Flag N OFF or unchanged (See note.)
Condition PV Completion Flag
Operating mode changed from RUN or
MONITOR mode to PROGRAM mode
or vice versa.
1
0000 OFF
Power supply interrupted and reset
2
0000 OFF
Execution of CNR(545)/CNRX(547),
the RESET TIMER/COUNTER
instructions
3
BCD: 9999
Binary: FFFF
OFF
Operation in interlocked program sec-
tion
(IL(002)–ILC(003))
Reset to SV. OFF
Operation in jumped program section
(JMP(004)–JME(005))
PV continues decre-
menting.
Retains previous sta-
tus.
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