Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 134)

9-12

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

Figure 9-6 shows the Retentive On-Delay 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 ––

t = programmed time

–– t ––

If the signal state of input I 0.0 changes from 0

to 1 (that is, there is a positive edge in the RLO),

timer T 5 is started. The timer continues to run

without regard to a signal change of input I 0.0

from1 to 0. If the signal state of input I 0.0

changes from 0 to 1 before the time has

elapsed, the timer is restarted. 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 if the time has elapsed and

I 0.1 remains on 0 (see also Section 9.3).

I 0.0

T 5

S_ODTS

TV BI

BCD

S5T# 2s

I 0.1

Q 4.0

RLO at S input

RLO at R input

Timer running

Signal state check for 1

Signal state check for 0

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – x x x 1

Status Word Bits

Timing Diagram

Figure 9-6 Retentive On-Delay S5 Timer

Example

Timer Instructions

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Siemens NAN 67 Series Wartungshandbuch Seite 134