Limit switch
For operation of the limit switches, switching
amplifiers have to be connected in the out
-
put circuit. Their function is to control the
limit values of the control circuit according
to EN 60947-5-6, thus ensuring operational
reliability of the positioner. If the positioner
is installed in hazardous areas, the relevant
regulations must be observed.
Binary input 1
An active contact can be operated at binary
input 1. The positioner can report the
switching state over the bus protocol.
Binary input 2
A passive, floating contact can be operated
at binary input 2.
The positioner can report the switching state
over the bus protocol.
Solenoid valve (forced venting function)
For positioners fitted with the optional sole-
noid valve for the forced venting function, a
voltage of 24 V DC must be connected to
the relevant terminals +81 and –82.
NOTICE
If there is no voltage connected for the sole
-
noid valve at terminals +81 and –82 or
when the voltage signal is interrupted, the
positioner vents the actuator and does not
respond to the reference variable.
Observe the switching thresholds specified
in the technical data.
5.2.1 Establishing communication
The communication structure between the
controller, logic solvers (PLC) or automation
system, or between a PC or work station
and the positioner(s) is implemented to con
-
form with IEC 61158-2.
48 EB 8384-5 EN
Connections
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