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Detailed descriptions
17.1 Motherboard
Pinout of the CPU fan power supply, X41
Pin No.
Abbreviation
1
GND
2
+12 V
3
CPU FAN_CLK
Pinout of the main fan power supply, X42
Pin No.
Abbreviation
1
GND
2
+12 V
3
PG1 FAN_CLK
Additional power supply connector (12V) for devices with 19'' front, X45.
Pin No.
Abbreviation
1
GND
2
GND
3
+12 V
4
-12 V
Connector for back-up battery, X49
A battery for buffering the CMOS RAM is connected to this connector. This is a 3.6 V Lithium
battery with a capacity of 750 mAh.
Pin No.
Abbreviation
1
+
2
-
Connection for On / Off switch connector, X53
Pin No.
Abbreviation
1
Power On
2
GND
17-22
Meaning
Ground
Switched power supply
Clock signal
Meaning
Ground
Switched power supply
Clock signal
Meaning
Ground
Ground
12 V power supply
12 V power supply
Meaning
Plus pole
Minus pole
Meaning
On signal
Ground
Operating instructions, Release 07/2006, A5E00877780-01
Input/Output
-
Output
Input
Input/Output
-
Output
Input
Input/Output
-
-
Input
Input
Input/Output
Input
-
Input/Output
Input
-
SIMATIC Panel PC 877
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