Festo MTR-DCI-...IO Series, Description, Page: 54 / 182

3. Installation
3-12
Festo P.BE-MTR-DCI-IO-EN en 1209d
3.5 Input for external reference switch
If you are not using a reference switch:
•
Seal the connection with the protective cap supplied
(ISK-M8).
Connecting the reference switch:
•
Use the correct switch type “normally-open contact” in
the PNP variant for the reference switch.
•
When connecting the reference switch use a sensor with a
screw-type lock (external thread M8x1) at the end of the
cable or use the connecting cable KM8-M8 with a screw-
type lock as an adapter.
Use e.g. the following proximity switches from Festo:
– magnetic proximity switch SMT-8F
– inductive proximity switch SIEN-...-M8B
•
When selecting the sensor, note that the accuracy of the
switchover point of the sensor determines the accuracy of
the reference point.
M8x1 socket Description
1 3 4
1 DC +24 V DC +24 V voltage output
(only for reference switch)
4 REF Contact reference switch
3 GND Ground
Tab. 3/7: Connection “Ref ” (reference switch) on the
MTR-DCI
The power supply for the reference switch (DC 24 V / Ground)
is provided via pin 1/3.