Siemens SIMATIC ET 200AL System Manual page 43

Connecting M8 connectors
To connect M8 connectors, proceed as follows:
1. Insert the connector in the appropriate round socket on the module.
2. Tighten the connector using the knurled screw with a torque of 0.4 Nm.
The figure below shows the connection of the M8 connectors, using the example of the
DIQ 4+DQ 4x24VDC/0.5A 8xM8 digital input/
digital output module.
Figure 5-8
Distributed I/O system
System Manual, 02/2018, A5E31861578-AF
Make sure that there is proper locking between the connector and socket.
Connecting M8 connectors
Connecting
5.6 Wiring
41