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Timer and Counter Instructions Section 3-5
When eight or fewer SVs are required, set the word after the last SV to 0000.
MTIM(543)/MTIMX(554) will ignore the SV that is set to 0000 and all of the
remaining SVs.
The timer’s PV is refreshed only when MTIM(543)/MTIMX(554) is executed,
so the timer will not operate properly when the cycle time exceeds 100 ms
because the timer increments in 100-ms units. To ensure precise timing and
prevent problems caused by long cycle times, input the same MTIM(543)/
MTIMX(554) instruction at several points in the program.
The timer’s Completion Flag is refreshed only when MTIM(543)/MTIMX(554)
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.
When MTIM(543)/MTIMX(554) is in a program section between IL(002) and
ILC(003) and the program section is interlocked, the PV will retain its previous
value (it will not be reset). Be sure to take this fact into account when
MTIM(543)/MTIMX(554) is programmed between IL(002) and ILC(003).
When an operating MTIM(543)/MTIMX(554) timer is in a program section
between JMP(004) and JME(005) and the program section is jumped, the PV
will retain its previous value. Be sure to take this fact into account when
MTIM(543)/MTIMX(554) is programmed between JMP(004) and JME(005).
Be sure that the words specified for the Completion Flags and PV (D1 and
D2) are not used in other instructions. If these words are affected by other
instructions, the timer might not time out properly.
If a word in the CIO area is specified for D1, the SET and RSET instructions
can be used to control the pause and reset bits.
Example When CIO 0.00 is ON and the pause bit (CIO 200.09) is OFF in the following
example, the timer will start operating when the reset bit (CIO 200.08) is
turned from ON to OFF. The timer’s PV will begin timing up from 0000.
The eight SVs in D200 through D207 are compared to the PV and the corre-
sponding Completion Flags (CIO 200.00 through CIO 200.07) are turned ON
when the SV
≤ PV.
to to
These SVs
are ignored.
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