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248
Timer and Counter Instructions
Section 3-6
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 operation of the = Flag and N Flag depends on the model of the CPU
Unit. Refer to Flags, above, for details.
The timer’s Completion Flag is refreshed only when TIM/TIMX(550) is exe-
cuted, 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 Com-
pletion Flag. The timer will not operate properly unless the Completion Flag is
reset.
A TIM/TIMX(550) instruction’s PV and Completion Flag can be refreshed in
the following ways depending on the timer number that is used.
Timers Created with Timer Numbers 0000 to 2047
Timers Created with Timer Numbers 2048 to 4095
Timers are reset (PV = SV, Completion Flag OFF) by power interruptions
unless the IOM Hold Bit (A50012) is ON and the bit is protected in the PLC
Setup. It is also possible use a clock pulse bit and a counter instruction to pro-
gram a timer that will retain its PV in the event of a power interruption, as
shown in the following diagram.
Example
When timer input CIO 000000 goes from OFF to ON in the following example,
the timer PV will begin counting down from the SV. Timer Completion Flag
T0000 will be turned ON when the PV reaches 0000.
When CIO 000000 goes OFF, the timer PV will be reset to the SV and the
Completion Flag will be turned OFF.
Execution of TIM/
TIMX(550)
The PV is updated every time that TIM/TIMX(550) is exe-
cuted.
The Completion Flag is turned ON if the PV is 0000.
The Completion Flag is turned OFF if the PV is not 0000.
After executing all tasks
The PV is also updated every cycle at the end of pro-
gram execution.
80-ms interval refreshing
If the cycle time exceeds 80 ms, the timer’s PV is
updated every 80 ms.
Execution of TIM
The PV is updated every time that TIM is executed.
The Completion Flag is turned ON if the PV is 0000.
The Completion Flag is turned OFF if the PV is not 0000.
Count input
Reset input
Execution
condition
1-s clock
pulse bit
Содержание SYSMAC CS Series
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Страница 186: ...146 List of Instructions by Function Code Section 2 4 ...
Страница 194: ...154 3 35 4 MOVE BIT MOVBC 568 1273 3 35 5 BIT COUNTER BCNTC 621 1275 3 35 6 GET VARIABLE ID GETID 286 1277 ...
Страница 1320: ...1280 Model Conversion Instructions Unit Ver 3 0 or Later Section 3 35 ...
Страница 1390: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...
Страница 1391: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits ...
Страница 1392: ...1352 ASCII Code Table Appendix A ...
Страница 1404: ...1364 Revision History ...