Siemens NAN 67 Series Wartungshandbuch Seite 128

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9-6
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
Figure 9-3 shows the Pulse S5 Timer instruction, describes the status word
bits, and shows the pulse timer characteristics. Certain restrictions apply to
the placement of timer boxes (see Section 6.1).
–– t ––
t = programmed time
I 0.0
If the signal state of input I 0.0 changes from 0 to 1
(that is, if there is a positive edge in the RLO), timer
T 5 is started. The timer continues to run with the
specified time of two seconds (2s) as long as input
I 0.0 is 1. If the signal state of input I 0.0 changes
from1 to 0 before the time elapses, the timer is
stopped. If the signal state of input I 0.1 changes
from 0 to 1 while the timer is running, the timer is
reset. The signal state of output Q 4.0 is 1 as long as
the timer is running.
Examples for other preset Time Values:
Available units: h (hours), m (minutes), s (seconds),
ms (milliseconds)
S5T#4s ––> 4 seconds
S5T#1h_15m ––> 1 hour and 15 minutes
S5T#2h_46m_30s––>2 hours, 46 minutes, and
30 seconds
T 5
S_PULSE
R
Q
TV BI
BCD
S5T# 2s
Status Word Bits
BR CC 1 CC 0 OV OS OR STA RLO FC
Write x x x 1
I 0.1
Q 4.0
S
Timing Diagram
RLO at S input
RLO at R input
Timer running
Signal state check for 1
Signal state check for 0
Figure 9-3 S5 Pulse Timer
Example
Timer Instructions
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