Siemens Simatic 620 Owner's Manual page 162

Hardware Information
PS Connection for Hard Disk
The power supply of the 3.5" hard disk is effected via this connection.
Pin No.
1
2
3
4
Connection for CPU Fan
The CPU fan is connected via this connection.
Pin No.
1
2
3
Connection for Device Fan
The device fan is connected via this connection.
Pin No.
1
2
Connection for Backup Battery
The battery for the standby supply to the CMOS RAM is connected to this
connection. A 3.6 V lithium battery with a capacity of 750 mAh is used.
Pin No.
1
2
7-30
Designation Description
P12V +12 V
GND Ground
GND Ground
P5V + 5V
Designation Description
GND Ground
+12V Switched power supply
CPU FAN_CLK Speed signal
Designation Description
+12V Switched power supply
GND Ground
Designation Description
+ Positive pole
– Negative pole
Input / Output
Output
–
–
Output
Input / Output
–
Output
Input
Input / Output
Output
–
Input / Output
Input
–
SIMATIC Box PC 620 Manual
A5E00131465-01