Electrical Interlinking Module - Festo VOFA-L26-T52-M Series Operating Instructions Manual

VOFA−...

Electrical interlinking module

Note
Electrical control of the solenoid valves must be made over two independent
channels to achieve the desired category.
Electrical connection example
In Fig. 6, the safety function is triggered through a two−pin emergency stop
pushbutton (S1). The safety switch device disconnects the power supply of both
solenoid valves (V1, V2) and reports the release to the PLC.
The PLC records the feedback signal of the safety switch device and the two sensor
signals of the control block. As a result, diagnosis of the solenoid valve is possible
both for operation and for safety.
The circuit shown is an example and can be replaced by other circuits as long as
both solenoid valves are switched off via electrically independent channels when
requesting the safety function and the signals of both proximity sensors (E1, E2)
are evaluated.
Festo VOFA−... 1004NH English
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