Mitsubishi Electric MELSEC iQ-R Series User Manual page 465

■Timer setting value and timer limit setting
When the condition is "Timer setting value < Scan time + Timer limit setting", the coil and the contact may be turned on at the
same time depending on the timing when the coil turns on. When the condition is not satisfied, reduce the timer limit setting
value to satisfy the condition.
Ex.
When changing the low-speed timer to high-speed timer and reducing the timer limit setting value (scan time: 20ms)
Before change (low-speed timer)
K1
(T0 )
■Timer limit setting
Low Speed Timer/Low Speed Retentive Timer: 100ms
Timer setting value (100ms  1 = 100ms) < Scan time (20ms) + Timer limit
setting (100ms)
The following shows an example of when the coil and the contact are turned on at the same time when the condition is "Timer
setting value < Scan time + Timer limit setting".
Ex.
In the case where the values are set as follows (timer setting value: 1 (1  100ms), scan time: 20ms, and timer limit setting:
100ms), when the coil of the timer (T0) turns on in the next scan after the coefficient of the END instruction becomes equal to
or higher than the timer setting value, the coil and the contact turns on at the same time because the timer current value
becomes equal to the timer setting value at startup of the timer.
Timer setting value
(1 100ms)
END
Program
100ms
counting
Count at
execution
0
of the END
instruction
Current
0
value of T0
OFF
X0
OFF
Coil of T0
OFF
Contact
of T0
(1) The coefficient of the END instruction becomes equal to or higher than the timer setting value. Therefore, when the coil turns on during this period, the
contact also turns on at the same time.
Scan time
(20ms)
END
1
0
0
20ms 20ms
After change (high-speed timer)
H K10
(T0 )
■Timer limit setting
High Speed Timer/High Speed Retentive Timer: 10.00ms
Timer setting value (10.00ms  10 = 100ms) < Scan time (20ms) + Timer limit
setting (10ms)
Timer limit setting
(100ms)
X0
END END
(1)
1 0
0 1
ON
ON
ON
20ms
Timer setting value
K1
T0
27 DEVICES
27.3 User Device
27
463