Mitsubishi Electric MELSEC iQ-R Series User Manual page 460

■Retentive timer (ST)
This device counts the sum of time duration in which the coil is turned on. When the retentive timer coil is turned on,
measurement starts and when the timer current value matches a setting value (when time is up), the retentive timer contact is
turned on. The current value and the contact on/off state is retained even when the retentive timer coil is turned off. When the
coil is turned on again, measurement starts with the retained current value. To clear the retentive timer current value and turn
off the contact, issue the RST ST instruction.
X0
ST0
2)
X1
RST
(1) Even though the coil (1)) turns off, the current value is held.
(2) Even though the coil (1)) turns off, the contact remains on.
■Long retentive timer (LST)
This device counts the sum of time duration in which the coil is turned on. When the long retentive timer coil is turned on,
measurement starts and when the timer current value matches a setting value (when time is up), the contact is turned on. The
current value and the contact on/off state is retained even when the long retentive timer coil is turned off. When the coil is
turned on again, measurement starts with the retained current value. To clear the long retentive timer current value and turn
off the contact, issue the RST LST instruction.
X0
OFF
Coil of LST0
OFF
Current value
0
of LST0
Contact of
OFF
LST0
RST LST0
instruction
(1) Even though the coil turns off, the current value is held.
(2) Even though the coil turns off, the contact remains on.
The long retentive timer (LST) can be used in interrupt programs. ( Page 115 Interrupt Program)
■Low-speed/high-speed timer (T/ST)
The low-speed timer and high-speed timer are the same device which is set to a low speed or high speed timer by writing the
instruction accordingly to specify it on the timer. For example, specifying OUT T0 generates a low-speed timer and specifying
OUTH T0 produces a high-speed timer even when using the same T0 device. This also applies to the retentive timer.
27 DEVICES
458
27.3 User Device
X0
K200
ST0
Coil of ST0 (1))
1)
Y10
Current value of
ST0
3)
ST0
Contact of
ST0 (2))
RST ST0
instruction (3))
ON
ON
1.5ms
1 ... 150
(1)
ON
OFF
ON
OFF
15 seconds
0 1 ... 150
OFF
0.5ms
150 151 ... 199 200
(2)
Instruction execution
5 seconds
150 151 ... 199
(1)
(2)
Instruction execution
0
200 0