VOFA-L26-T32C-M-G14-1C1-...
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Festo – VOFA-L26-T32C-M-G14-1C1-... – 1409NH English
5.2
Electrical interlinking module
Note
Electrical control of the solenoid valves must satisfy the requirements of the category to
be achieved: It can be realized using a common secure electrical output or two inde-
pendent secure channels.
In the electrical connection example (Fig. 3), the safety function is triggered by a two-pin emergency
stop button (S1, with locking function) on a safety switching device. The safety switching device discon-
nects 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 switching device and the two sensor signals of the
control block. As a result, testing of the solenoid valves is possible both for operation and for safety.
1
2
3
1
Safety switching device
2
Control block
3
Programmable logic controller (PLC)
Fig. 3
Example of a two-channel electrical interlinking of the control block with diagnostic test
equipment
This circuit is an example and can be replaced by other circuits, as long as both solenoid valves are
controlled according to the requirements of the category to be achieved and the signals of both proxim-
ity sensors (E1, E2) are evaluated.
