Connecting
6.5 Power supply
SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
133
Connecting 24 V safety extra-low voltage (SELV)
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The power supply is connected using a 4-pin plug-in terminal block.
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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.
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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
6.5.1.2
24 VDC - product group X-300
Table 6- 2
24 to 48 VDC safety extra-low voltage overview
Device
Device version
(power supply)
24 V safety extra-low voltage
(SELV)
can be connected redundantly
X304-2FE
1 x 24 VDC
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X306-1LD FE
1 x 24 VDC
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X307-3
1 x 24 VDC
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X307-3LD
1 x 24 VDC
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X308-2
1 x 24 VDC
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X308-2LD
1 x 24 VDC
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X308-2LH
1 x 24 VDC
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X308-2LH+
1 x 24 VDC
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X310
1 x 24 VDC
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X310FE
1 x 24 VDC
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