Electrical connection Liquiline CM442/CM444/CM448
32 Endress+Hauser
6.4 Connecting additional inputs, outputs or relays
Module not covered
No shock protection. Danger of electric shock!
‣ If you are modifying or extending your hardware, always fill the slots from left to right. Do
not leave any gaps.
‣ If not all the slots are occupied, always insert a dummy or end cover into the slot to the right
of the last module (→ å 2, item 4). This ensures the unit is shock-protected.
‣ Always ensure shock protection is guaranteed particularly in the case of relay modules (2R,
4R, AOR).
2. Connection via M12 plug-in connection
a0018019
Fig. 45: M12 plug-in
connection (e.g. on
sensor module)
1 Sensor cable with M12
connector
a0018021
Fig. 46: M12 assignment
Top: socket
Bottom: connector
(top view in each
case)
1 PK (24 V)
2 GY (ground 24 V)
3BN (3 V)
4WH (ground 3 V)
5 GN (Memosens)
6 YE (Memosens)
7, NC Not connected
Device versions with a premounted M12
socket are ready-wired upon delivery.
Install an M12 socket, which is available as an
accessory, in a suitable cable gland opening in
the base of the housing, and connect the cables
to the Memosens terminals of the sensor or
base module as per the wiring diagram
(→ å 45).
Connecting the sensor
‣ Connect the plug of the sensor cable (item
1) directly to the M12 socket.
Please note the following for these device
versions:
• The internal device wiring is always the
same regardless of what kind of sensor you
connect to the M12 socket (plug&play).
• The signal and power supply cables are
assigned in the sensor plug-in head in such
a way that the PK and GY power supply
cables are either used (e.g. optical sensors)
or not (e.g. pH or ORP sensors).
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