Siemens NAN 67 Series Wartungshandbuch Seite 278

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B-12
Ladder Logic (LAD) for S7-300 and S7-400
C79000-G7076-C504-02
MW200
I12.0
Q12.1
Network 1: Counter C1 counts up at each signal change from “0” to “1” at input CU and counts down
at each signal change from “0” to “1” at input CD. With a signal change from “0” to ”1” at input S, the
counter value is set to the value PV. A signal change from “0” to “1” at input R resets the counter
value to “0”. MW200 contains the current counter value of C1. Q12.1 indicates “storage area not
empty”.
Q12.0
Network 2: Q12.0 indicates ”storage area empty”.
Q12.1
Network 3: If 50 is less than or equal to the counter value (in other words if the current counter value
is greater than or equal to 50), the indicator lamp for “storage area 50% full” is lit.
CMP
IN1
50
Q15.2
IN2
Network 4: If the counter value is greater than or equal to 90, the indicator lamp for “storage area 90%
full” is lit.
CMP
IN1
>= I
90
MW200
Q15.3
IN2
<= I
Network 5: If the counter value is greater than or equal to 100, the indicator lamp for “storage area full”
is lit. Use output Q4.4 to interlock conveyor belt 1.
CMP
IN1
>= I
100
MW200
Q15.4
IN2
S_CUD
CD
QCU
S
PV
CV
R
CV_BCD
I12.3
I12.2
I12.1
C#10
C1
MW210
MW200
Figure B-10 Ladder Logic for Activating Indicator Lamps on a Display Panel
Programming Examples
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