Siemens SIMATIC Panel PC 870 Equipment Manual page 114

Hardware Information
Pin assignment of the ATX power supply connector, X50
Pin Short
No. Name
1
3.3 V
2
3 GND
4 5 V
5 GND
6 5 V
7 GND
8 PowerGood
9 AUX-5V
10 12 V
11 3.3 V
12 –12 V
13 GND
14 PSOFF
15
16
GND
17
18 –5 V
19
5 V
20
7-20
Meaning
3.3 V power supply
Ground
5 V power supply
Ground
5 V power supply
Ground
5 V auxiliary voltage
12 V power supply
3.3 V power supply
-12 V power supply
Ground
Ground
-5 V power supply
5 V power supply
SIMATIC Panel PC 870 Computing Unit, Equipment Manual
Release 11/02
Input / Output
Input
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Input
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Input
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Input
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Output
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Input