
Timer Instructions
Ladder Logic (LAD) for S7-300 and S7-400 Programming
13-20
A5E00706949-01
Example
Network 3
Network 2
Network 1
I 0.0
SD
T5
T5
Q A.0
S5T#2S
I 0.1
T5
R
If the signal state of input I0.0 changes from "0" to "1" (positive edge in RLO), the
timer T5 is started. If the time elapses and the signal state of input I0.0 is still "1",
the signal state of output Q4.0 will be "1".
If the signal state of input I0.0 changes from "1" to "0", the timer remains idle and
the signal state of output Q4.0 will be "0". A signal state change from "0" to "1" at
input I0.1 will reset timer T5 which stops the timer and clears the remaining portion
of the time value to "0".
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