Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 130)

9-8

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

C79000-G7076-C504-02

Figure 9-4 shows the Extended 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 –– –– t ––

t = programmed time

Status Word Bits

Timing Diagram

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – x x x 1

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 with the

specified time of two seconds (2s) without regard to a

negative edge at input S. 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 as long as the timer is running (see also

Section 9.3).

I 0.0

T 5

S_PEXT

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

Figure 9-4 Extended Pulse S5 Timer

Example

Timer Instructions

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 317 318

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Siemens NAN 67 Series Manual de servicio Pagina 130