Connecting
6.4 Power supply
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12
129
Connecting 24 V safety extra-low voltage (SELV)
● The power supply is connected using a 4-pin plug-in terminal block.
● The power supply can be connected redundantly. Both inputs are isolated. There is no
distribution of load. When a redundant power supply is used, the power supply unit with
the higher output voltage supplies the IE Switch X-300 alone.
● The power supply is connected over a high resistance with the enclosure to allow an
ungrounded set up. The two power inputs are non-floating.
Terminal block assignment (4-pin)
Table 6- 1 Pinout of the 24 V safety extra-low voltage (SELV)
Pin number Assignment Labeling (example)
Pin 1 L1+ 24 V DC
Pin 2 M1
Pin 3 M2
Pin 4 L2+ 24 V DC
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