Siemens SIMATIC ET 200AL System Manual page 55

Connecting M12 plugs
To connect M12 plugs, proceed as follows:
1. Insert the connector in the appropriate round socket on the module.
Make sure that there is proper locking between the connector and socket (nut and spring).
2. Tighten the connector using the knurled screw with a torque of 1 Nm.
The figure below shows the connection of the M12 plugs, using the example of the analog
input module AI 4xU/I/RTD 4xM12.
Figure 5-10
Pin assignment of the sockets
The pin assignment of the sockets can be found in the manuals for the interface modules
(https://support.industry.siemens.com/cs/ww/en/ps/14246/man) and I/O modules
(https://support.industry.siemens.com/cs/ww/en/ps/14247/man) in the section on pin
assignment and on the side surface of the module.
Distributed I/O system
System Manual, 08/2021, A5E31861578-AJ
Connecting M12 plugs
Connecting
5.7 Wiring
53