3.2 Connecting PROFIBUS stations via plug connections

Plug connection is the most frequent type of connection for PROFIBUS stations. Most of the devices using RS-485 transmission technology and copper cables are equipped with a 9-pin Sub-D plug connection. In addition, M-12 plug connections are used for RS-485 transmission technology as well as for PROFIBUS-MBP (PA) transmission. However, the two connector variants differ slightly from each other.
Station connection using connectors is very simple. After assembling the PROFIBUS cable, the plug connection only needs to be pushed into the station socket. The shield connection of the PROFIBUS cable with the PROFIBUS station is also carried out via the plug connection.

The following instructions apply to all types of plug connections for copper cables. The connectors shown in the following diagrams are examples only.

1. Due to their construction, twisting the connectors is generally not possible. To prevent damage, check how the plug and socket fit together before making the connection. This is particularly important for M-12 plug connections.
   
   
   
   
2. Touch connectors only at the housing.
   
   
   
   
3. Do not apply excessive force when connecting the plug connection.
   
   
   
   
4. In case of tightness, check the plug pins. In the case of bent pins, replace the connector.
   
   
   
   
5. Tighten the connector fastening screws after making the connection. They are a part of the strain relief system. In addition, they will avoid the connector becoming loose.