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Siemens SIMATIC S5-95F - Page 189

Siemens SIMATIC S5-95F
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S5-95F STEP 5 Operations
RS Flip-Flop with Flags (set dominant)
Circuit DiagramExample
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I 0.1I 0.0
F 1.7
A "1" at input I 0.0 sets flip-flop F 1.7 (signal state "1").
If the signal state at input I 0.0 changes to "0", the state of
flag F 1.7 is maintained, i.e., the signal is latched.
A "1" at input 0.1 resets the flip-flop (signal state "0"). If
the signal state at input I 0.1 changes to "0", flag F 1.7
retains signal state "0".
If both inputs have a "1" signal state, the flip-flop is set (set
dominant).
The signal state of the flag is scanned and transferred to
output Q 1.0.
STL
F 1.7
R
SQ
LADCSF
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I 0.0
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I 0.1
I 0.1
I 0.0
F 1.7
R
S
Q Q 1.0
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Q 1.0
A I 0.1
R F 1.7
A I 0.0
S F 1.7
A F 1.7
= Q 1.0
EWA 4NEB 812 6210-02
8-9

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