Connecting
6.5 Power supply
SCALANCE X-300
136 Operating Instructions, 05/2016, A5E01113043-20
Connecting a redundant power supply to 1 power supply unit
Use the terminal block "X1" to connect the power supply.
Image 6-1 Assignment of the LED display to the pins for redundant power supply with devices with
one power supply unit
Image 6-2 Assignment of the LED display to the pins for redundant power supply with devices with
two power supply units
● If the power supply fails at pins L1/M1, this is indicated by LED L1.
● If the power supply fails at pins L2/M2, this is indicated by LED L2.
Connecting a redundant power supply to 2 power supply units
To connect the power supplies, use pins L1/M1 of the left terminal block "X1" and pins L1/M1
of the right terminal block "X2". Only "L1" is monitored on each terminal block.
Since both power supply units have connectors for redundant power supply, you can
connect 2 power supplies to each of the two power supply units. This should, however, only
be necessary in extremely rare situations.
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