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Chapter 4. Ladder Diagram (LD) Programming
Timer Pulse
When the input IN transitions from OFF to ON, the timer sets the output Q to ON for
the specified time interval, PT
Timing Diagram
IN
Q
PT
ET
t0
t1
t2
t0 When input IN is set to ON, the timer starts to measure time and the elapsed time output, ET,
increments until its value equals that of the specified preset time, PT. Q is set to 0 on until ET
equals PT.
t1 When ET equals PT, Q is set to OFF. The value of ET is held until IN is set to OFF.
t2 When IN is set to OFF, ET is set to 0.
t3 When IN is set to ON, the timer starts to measure time and ET begins incrementing. Q Is set to
ON.
t4 If the input is OFF for a period shorter than the input PT, the output Q remains on and ET
continues Incrementing.
t5 When ET equals PT, Q is set to OFF and ET is set to 0.
Example
In the following sample rung, a TP function block is used to set Sprayers to ON for a 5-second
(5000ms) pulse.
232
PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual
PT
t3
t4
t5
GFK-2950C
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