Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 281)

B-15

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

C79000-G7076-C504-02

T 1

“Heating starts”

Q 4.0

RET

Network 1: If the timer is running, then turn on the heater. If the timer is running, the Return

instruction ends the processing here.

Network 3: Mask input bits I 0.4 through I 0.7 (that is, reset them to 0). These bits of the thumbwheel

inputs are not used. The 16 bits of the thumbwheel inputs are combined with W#16#0FFF according

to the (Word) And Word instruction. The result is loaded into memory word MW1. In order to set the

time base of seconds, the preset value is combined with W#16#2000 according to the (Word) Or

Word instruction, setting bit 13 to 1 and resetting bit 12 to 0.

Network 4: Start timer T 1 as an extended pulse timer if the start push button is pressed, loading as

a preset value memory word MW2 (derived from the logic above).

WAND_W

IN1

ENOEN

IN2

OUT

W#16#FFF

IW0

MW1

WOR_W

IN1

ENOEN

IN2

OUTMW1

W#16#2000

MW2

“Start”

I 0.7

T 1

MW2

T 1

Network 2: If the timer is running, the Return instruction ends the processing here.

Figure B-13 Ladder Logic for Heating an Oven

Programming Examples

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Siemens NAN 67 Series Wartungshandbuch Seite 281