Siemens S7-400 Service Manual Page 170

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Timer Instructions
Ladder Logic (LAD) for S7-300 and S7-400 Programming
13-10
A5E00706949-01
Timing Diagram
On-Delay timer characteristics:
t
t = Programmed time
RLO at S input
RLO at R input
Timer running
Scan for "1"
Scan for "0"
tt
Status word
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - x x x 1
Example
S_ODT
S
Q
BITV
R BCD
I 0.0
I 0.1
S5TIME#2S
Q 4.0
T 5
If the signal state of I0.0 changes from "0" to "1" (positive edge in RLO), the timer
T5 will be started. If the time of two seconds elapses and the signal state at input
I0.0 is still "1", the output Q4.0 will be "1". If the signal state of I0.0 changes from
"1" to "0", the timer is stopped and Q4.0 will be "0" (if the signal state of I0.1
changes from "0" to "1", the time is reset regardless of whether the timer is running
or not).
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