Siemens SCALANCE X-300 Series Operating Instructions Manual page 134

Connecting
6.6 Power supply
F1
Figure 6-6
● 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 "PS1" and pins L2/M2
of the right terminal block "PS2".
F1
Figure 6-7
● 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.
It would also be possible to use the L1/M1 pins of the right terminal block. In this case, however,
identification of the terminal block involved from the LED display is not immediately obvious.
134
L1 L2 L1 L2
F2 L1 M1 L1 M1 M2 M2 L2 L2
PS1
Assignment of the LED display to the pins for redundant power supply with devices with two
power supply units
L1 L2 L1 L2
F2 L1 M1 L1 M1 M2 M2 L2 L2
PS1
Assignment of the LED display to the pins for redundant power supply with devices with two
power supply units.
F1 F2 L1 M1 L1 M1 M2 M2
PS2
F1 F2 L1 M1 L1 M1 M2 M2
PS2
Operating Instructions, 11/2019, A5E01113043-24
L2 L2
L2 L2
SCALANCE X-300