Connecting
5.2 Ports
SCALANCE X-400
Operating Instructions, 06/2015, C79000-G8976-C186-12
101
5.2
Ports
5.2.1
Connectors of the power supply (X1) of the SCALANCE X-400
Polarity reversal protection X1, X2
The two 4-pin male connectors (X1, X2) for the power supply and the signaling contact have
no polarity reversal protection. If the connectors are accidentally swapped over, this does not
cause damage or destroy circuits. Normal functionality is, however, not available while the
connectors are swapped over.
Connectors of the power supply (X1)
The redundant power supply is connected over a 4-pin connector at the front terminal block
on the power module.
Figure 5-1
Pins of connector X1
Conn. 1
L1+
+ 24 V power supply 1
M1
Ground
M2
Ground
L2+
+ 24 V power supply 2
