Siemens SIMATIC PANEL PC 877 - Manual (Page 214)

Detailed descriptions
17.1 Motherboard
SIMATIC Panel PC 877
17-22
Operating instructions, Release 07/2006, A5E00877780-01
Pinout of the CPU fan power supply, X41
Pin No. Abbreviation Meaning Input/Output
1 GND Ground -
2 +12 V Switched power supply Output
3 CPU FAN_CLK Clock signal Input
Pinout of the main fan power supply, X42
Pin No. Abbreviation Meaning Input/Output
1 GND Ground -
2 +12 V Switched power supply Output
3 PG1 FAN_CLK Clock signal Input
Additional power supply connector (12V) for devices with 19'' front, X45.
Pin No. Abbreviation Meaning Input/Output
1 GND Ground -
2 GND Ground -
3 +12 V 12 V power supply Input
4 -12 V 12 V power supply Input
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 Meaning Input/Output
1 + Plus pole Input
2 - Minus pole -
Connection for On / Off switch connector, X53
Pin No. Abbreviation Meaning Input/Output
1 Power On On signal Input
2 GND Ground -