Parameterization and Operation
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A ... D Sensor Usage
When selecting one of the options A ... D, the transducer block determines from the position
feedback contact signals the position of the valve as "open", "closed", "intermediate" at that
moment. Whether an actuated sensor or activated mechanical contact represents an open or a
closed valve, depends on the design of the position feedback and the electrical characteristics
of the final position feedback contacts. A general representation is thus not possible.
Each of the 4 options corresponds to 1 set of combinations of the 2 final position feedback
contacts signals and the valve positions "open", "intermediate", and "closed". The following
4 tables show the signal combinations of final position feedback contact A and final position
feedback contact B assigned to a valve position for the options A ... D.
Sensor Usage A
Sensor Usage B
Sensor Usage C
Sensor Usage D
Valve Position
Final Position
Feedback
Contact A
Final Position
Feedback
Contact B
Closed
0
1
Intermediate
0
0
Open
1
0
Uncertain
1
1
Valve Position
Final Position
Feedback
Contact A
Final Position
Feedback
Contact B
Closed
1
0
Intermediate
1
1
Open
0
1
Uncertain
0
0
Valve Position
Final Position
Feedback
Contact A
Final Position
Feedback
Contact B
Closed
1
0
Intermediate
0
0
Open
0
1
Uncertain
1
1
Valve Position
Final Position
Feedback
Contact A
Final Position
Feedback
Contact B
Closed
0
1
Intermediate
1
1
Open
1
0
Uncertain
0
0