Chapter 5 CPU Module
5-
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3) Integral timer
In general, its operation is same as on-delay timer. Only the difference is the current value will not be clear when the input
condition of TMR instruction is turned off. It keeps the elapsed value and restart to increase when the input condition is
turned on again.
When the current value reaches preset value, the timer output relay is turned on.
The current value can be cleared by the RST instruction only.
4) Monostable timer
In general, its operation is same as off-delay timer. However, the change of input condition is ignored while the timer is
operating (decreasing).
Timer input condition
Timer output relay
Preset value (PV)
Current value
t1
t2
t3
PT=t1+t2+t3
Timer reset input
Timer input condition
Timer output relay
Preset value (PV)
Current value
PT
(On operation)
(ignored)
(ignored)
