262
Timer and Counter Instructions Section 3-6
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.
Note When TIMU(541)/TIMUX(556) 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.
TIMUH(544)/TIMUHX(557) timers may not time accurately when used in a
program section jumped by the JMP(004), CJMP(510), CJPN(511), and
JME(005) instructions.
When a TIMU(541)/TIMUX(556) timer is forced set, its Completion Flag will
be turned ON. When a TIMU(541)/TIMUX(556) timer is forced reset, its Com-
pletion Flag will be turned OFF.
If online editing is used to overwrite a timer instruction, always reset the Com-
pletion Flag. The timer will not operate properly unless the Completion Flag is
reset.
A TIMU(541)/TIMUX(556) instruction’s Completion Flag is refreshed as
shown in the following table.
Operation Example
When timer input CIO 000000 goes from OFF to ON in this example, the timer
PV will begin counting down. The Timer Completion Flag, T0000, will be
turned ON after 1.23 ms.
When CIO 000000 goes OFF, the Timer Completion Flag, T0000, will be
turned OFF.
3-6-6 ACCUMULATIVE TIMER: TTIM(087)/TTIMX(555)
Purpose TTIM(087)/TTIMX(555) operates an incrementing timer with units of 0.1-s.
The setting range for the set value (SV) is 0 to 999.9 s for TTIM(087) and 0 to
6,553.5 s for TTIMX(555). The timer accuracy is –0.01 to 0 s.
Note The timer accuracy for CS1D CPU Units is 10 ms + the cycle time
Execution of CNR(545)/CNRX(547), the RESET TIMER/
COUNTER instructions
OFF
Operation in interlocked program section
(IL(002)–ILC(003))
OFF
Operation in jumped program section
(JMP(004)–JME(005))
Retains previous status.
Condition Completion Flag
Execution of TMUH(544)
/TMUHX(557)
The Completion Flag is turned ON if the SV is reached.
The Completion Flag is turned OFF if the SV has not been
reached.
or
TMUH
#0123
&0123
TMUHX
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