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DC Port of the Power Supply Units
The power supply unit has a connector (X2) through which all the signals on the
DC side are connected with the motherboard.
Pin
Row A
No.
1
PwrGood
2
TTY_VCC
3
TTY_GND
4
NAU_N
5
GND
6
P12V
7
V_DC
8
N12V
9
GND
10
GND
11
P3V3
12
P3V3
13
GND
14
GND
15
GND
16
GND
17
P5V
18
P5V
19
P5V
20
P5V
SIMATIC Box PC 620 Manual
C79000-G7076-C639-04
Meaning
Power Good Signal
Potential–free VCC (15V ±
3V) for TTY port
TTY_GND
Power failure early warning
alarm
GND
+12V
for processor module
-12V
GND
GND
+3.3V
+3.3V
GND
GND
GND
GND
+5V
+5V
+5V
+5V
Hardware Information
Pin
Row B
No.
1
PwrGood
Potential–free VCC (15V ±
2
TTY_VCC
3
TTY_GND
4
NAU_N
Power failure early warning
5
GND
6
P12V
7
V_DC
8
N12V
9
GND
10
GND
11
P3V3
12
P3V3
13
GND
14
GND
15
GND
16
GND
17
P5V
18
P5V
19
P5V
20
P5V
Meaning
Power Good Signal
3V) for TTY port
TTY_GND
alarm
GND
+12V
for processor module
-12V
GND
GND
+3.3V
+3.3V
GND
GND
GND
GND
+5V
+5V
+5V
+5V
8-33

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