27 DEVICES
27.3 User Device
463
27
■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.
When changing the low-speed timer to high-speed timer and reducing the timer limit setting value (scan time: 20ms)
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".
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.
Before change (low-speed timer)
■Timer limit setting
Low Speed Timer/Low Speed Retentive Timer: 100ms
Timer setting value (100ms 1 = 100ms) < Scan time (20ms) + Timer limit
setting (100ms)
After change (high-speed timer)
■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)
(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.
(T0 )
K1
(T0 )
H K10
20ms 20ms 20ms
END
00 01
00 1 0
OFF
ON
ON
ON
OFF
OFF
X0
Coil of T0
Contact
of T0
END END END
X0
K1
T0
Count at
execution
of the END
instruction
100ms
counting
1
Current
value of T0
Program
Timer setting value
Scan time
(20ms)
Timer limit setting
(100ms)
Timer setting value
(1 100ms)
(1)
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