Siemens SINAMICS S120 System Manual page 217

Only use shielded cables to connect the sensors. Only use round cables to ensure that they
remain sealed. Connect the cables to the sensor using a round connector. Connect the cable
shields to the upper side of the module using the shield connection elements.
Note
Connector type
The connector used must establish a continuous shield connection between the cable shield
and the sensor of the shutoff valve. Even for connectors with metal housing, the shield
connection is not always continuous for all types.
• Ensure that there is a shield connection available.
• Observe the "Danger to life through electric shock due to unconnected cable shields"
note in Chapter "Fundamental safety instructions (Page 15)".
Coding
In order to prevent interchanging the mating connectors between axes 1 and 2 and between
the shutoff valve sensors, as well as the enable input, the terminals and the associated
connectors X281 / X282 are equipped with coding elements when they are supplied.
Hydraulic Drive
System Manual, 04/2015, 6SL3097-4BA00-0BP1
Hardware
6.2 Interfaces
217