2.2 Additional equipment
Solenoid valve
If the operating voltage for the solenoid valve (12) fails, the supply pressure for the i/p module is
vented to the atmosphere. The positioner can no longer operate and the control valve moves to
the fail-safe position determined by the actuator, regardless of the reference variable.
NOTICE
In manual mode (MAN), the manual set point is also reset to 0 %. A different manual set
point must be entered again (Code 1).
Inductive limit switch
The rotary shaft of the positioner carries an adjustable tag which actuates the installed proximity
switch.
External position sensor
In this version, only the sensor is mounted to the control valve. The positioner is located sepa-
rately from the valve. The connection of x and y signals to the valve is established by cable and
piping for air (only without inductive limit switch).
Binary inputs
Binary input BE1 (14):
The positioner has a standard binary input for DC voltage signals, which allows process infor-
mation to be exchanged over the F
OUNDATION
™
fieldbus network.
Binary input BE2 (15):
This binary input is optional. It is an active input which connects a floating contact which is pow-
ered by the positioner. The switching state of the binary input can be indicated over the
F
OUNDATION
™
fieldbus network.
Note: The binary inputs are configured in the DI Function Blocks.
KH 8384-5 EN 9
Principle of operation
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