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(4)
Low-speed timer
(a) Definition
This type of timer measures time in increments of 1 to 1000ms.
The timer starts time measurement when its coil is turned on, and when it times out, the contact is
turned on. If the timerís coil is turned off, the current value is changed to "0" and the contact is
turned off.
[Ladder example]
X0
[Timing chart]
X0
OFF
T0 coil
OFF
T0 contact
OFF
Figure 9.22 Ladder example and timing chart of a low-speed timer
(b) time increment setting
The time increment is set in the PLC system tab of the PLC parameter dialog box.
The default is 100ms, and it can be changed in increments of 1ms.
(5)
High-speed timer
(a) Definition
This type of timer measures time in increments of 0.01 to 100ms.
The timer starts time measurement when its coil is turned on, and when it times out, the contact is
turned on. If the timerís coil is turned off, the current value is changed to "0" and the contact is
turned off.
[Ladder example]
X0
[Timing chart]
X0
OFF
T200 coil
OFF
T200 contact
OFF
Figure 9.23 Ladder example and timing chart of a high-speed timer
(b)
setting
Time increment
The time increment is set in the PLC system tab of the PLC parameter dialog box.
The default is 10.0ms, and it can be changed in increments of 0.01ms.
K10
When X0 is turned on, coil of T0 is turned on, and the
TO
contact turns on after 1s. (when unit of the timer is set
to 100ms)
ON
ON
1s
ON
High-speed timer indication
H
K50
When X0 is turned on, coil of T200 is turned on, and the
T200
contact turns on after 0.5s. (when unit of the timer is set
to 10ms)
ON
ON
0.5s
ON
CHAPTER9 DEVICES
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