Timer (T/St) - Mitsubishi Electric MELSEC iQ-F FX5 User Manual
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Timer (T/ST)
Device whereby measurement starts when the timer coil is turned ON, time up occurs when current value reaches the setting
value, and the contact is turned ON. The timer is an addition type counter. When time is up, the current value and setting
value are the same value.
Types of timers
There are timers (T) for which current value is maintained in 16 bits, and retentive timers (ST) that maintain the current value
even when the coil is turned OFF.
*1 Current value of timers (T) becomes "0" when the coil is turned OFF.
■Timer (T)
Measurement starts when the timer's coil is turned ON. Time up occurs when the current value of the timer matches the
setting value and the timer's contact is turned ON. When the timer's coil is turned OFF, the current value becomes "0" and the
timer's contact is turned OFF.
2)
X0
K10
T0
1)
T0
Y10
3)
■Retentive timer (ST)
Measures time for which the coil is ON. Measurement starts when the retentive timer's coil is turned ON, and when the current
value matches the setting value (time up), the retentive timer's contact is turned ON. The current value and ON/OFF status of
the contact are maintained even if the retentive timer's coil is turned OFF. When the coil is turned back ON, measurement
resumes from the current value maintained. The current value is cleared and the retentive timer is turned OFF by the RST
ST instruction.
2)
X0
K200
ST0
1)
ST0
Y10
3)
X1
4)
RST ST0
■Low-speed timer/Timer/High-speed timer (T/ST)
Low-speed timers, timers and high-speed timers are the same device. The timer is specified (by instruction) as a low-speed
timer, timer, or high-speed timer. If for example, you specify "OUT T0," the timer is a low-speed timer (100 ms); if you specify
"OUTH T0," it is a timer (10 ms); if you specify "OUTHS T0," it is a high-speed timer (1 ms). The same goes for retentive
timers.
■Routine timer (T)
The routine timer is a timer (100ms) that can operate even with a program that is not necessarily executed with every scan.
Eight timers can be used at the maximum. This timer counts when the OUT T instruction, the ANS instruction, or the END
instruction is executed.
To use a routine timer, it is necessary to set the parameter. (Page 239 Routine timer setting)
*1
ON
X0
OFF
ON
T0 coil (1))
OFF
T0 contact (3))
OFF
ON
X0
OFF
ON
ST0 coil (1))
OFF
Current value of
0
ST0
Current value is held even if
the coil (1)) is turned OFF.
ST0 contact (3))
OFF
RST ST0
instruction (4))
1
ON
second
15 seconds
1
150
150
Contact remains ON even if
the coil (1)) is turned OFF.
5
seconds
151
199
200
0
Instruction
execution
21 DEVICES
237
21.2 User Devices
21
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