Siemens S5-100U - Page 184

S5-100U STEP 5 Operations
Resetting a Counter “R” and Counting Up “CU”
Example:
When input I 0.0 is switched on, the count in counter 1 is incremented by 1. As long as a second
input (I 0.1) is “1”, the count is reset to “0”.
The A C 1 operation results in signal state “1” at output Q 1.0 as long as the count is not “0”.
I 0.0
LAD
R C 1
STL CSF
A I 0.0
CU C 1
NOP 0
NOP 0
NOP 0
A I 0.1
RC1
NOP 0
NOP 0
AC1
= Q 1.0
Circuit DiagramTiming Diagram
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Time
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I 0.0
I 0.1
C 1
Q 1.0
0
I 0.1
S CIR
Binary
16 bits
Q 1.0
I 0.0
CQ
I I I I
C 1
I 0.1 Q 1.0
CU
CD
S
CV BI
DE
RQ
C 1
I 0.0
Q 1.0
I 0.1
CU
CD
S
CV BI
DE
RQ
EWA 4NEB 812 6120-02 8-29