Mitsubishi L02CPU, Руководство пользователя, Страница: 242 / 340

240
(5) Retentive timer
This timer measures the period of time during which the coil is on. The time increment is set in the same manner
as the corresponding low- or high-speed timer.
• Low-speed retentive timer: Low-speed timer
• High-speed retentive timer: High-speed timer
The timer starts time measurement when its coil is turned on, and when it times out, the contact is turned on.
Even if the timer's coil is turned off, the current value and the on/off status of the contact are retained. When the
coil is turned on again, the measurement restarts from the retained current value. The current value and the
contact off status can be cleared with the RST ST instruction.
(6) Timer processing and accuracy
(a) Processing
When the OUT T or OUT ST instruction is executed, the on/off switching of the timer coil, current value
update, and on/off switching of the contact are performed. In the END processing, the current timer value is not
updated and the contact is not turned on/off.
OFF
OFF
ON
ON
ON
X0
OFF
OFF
0 to 1 0
X1
150
ON
X0 on time is measured for 20s when unit of
the timer is 100ms.
Retentive timer indication
When X1 is turned on, ST0 contact is reset
and the current value is cleared.
[Program example]
[Timing chart]
Coil of ST0
RST ST0
instruction
Contact of
ST0
Current value
of ST0
15s 5s
Current value is held even if
the coil is turned off.
Contact remains on even if the coil is
turned off.
Instruction execution
151 to 200
END OUT T0 END
[Program example]
[Processing at execution of OUT T0 instruction]
Processing
Coil ON/OFF
Current value update
Contact ON/OFF