Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 273)

100

101

B-7

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

C79000-G7076-C504-02

B.3 Timer Instructions

You can use a clock pulse generator or flasher relay when you need to

produce a signal that repeats periodically. A clock pulse generator is common

in a signalling system that controls the flashing of indicator lamps.

When you use the S7-300, you can implement the clock pulse generator

function by using time-driven processing in special organization blocks. The

example shown in the following ladder logic program, however, illustrates

the use of timer functions to generate a clock pulse.

The sample program in Figure B-5 shows how to implement a freewheeling

clock pulse generator by using a timer (pulse duty factor 1:1). The frequency

is divided into the values listed in Table B-5.

Clock Pulse

Generator

Programming Examples

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