Mitsubishi Electric L02SCPU User's Manual And Reference page 303

(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.
[Program example]
[Timing chart]
X0 OFF
OFF
Coil of ST0
Current value
of ST0
Contact of OFF
ST0
RST ST0
instruction
X1 OFF
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.
ON
ON
15s
0 1 to 150
Current value is held even if
the coil is turned off.
Contact remains on even if the coil is
turned off.
CHAPTER 5 DEVICES
5s
0
151 to 200
ON
Instruction execution
ON
5
301