Detailed descriptions
16.1 Motherboard
SIMATIC HMI IPC677C
Operating Instructions, 04/2013, A5E02722710-04
205
Pin assignment of the equipment fan, X132
Pin no.
Short description
Meaning
Input / Output
1
GND
Ground
-
2
+12 V
Switched voltage supply
Output
3
CPU FAN_CLK
Clock signal
Input
Pin assignment of the supply for the power supply fan, X131
Pin no.
Short description
Meaning
Input / Output
1
GND
Ground
-
2
+12 V
Switched voltage supply
Output
3
PG1 FAN_CLK
Clock signal
Input
Connection for backup battery, X24, X240 (BATT)
A battery for buffering the CMOS RAM is connected to this connector. This is a 3 V Lithium
battery with a capacity of 750 mAh.
Pin no.
Short description
Meaning
Input / Output
1
+
Plus pole
Input
2
-
Minus pole
-
Tap of the backup battery, X2400 (OUT)
This connection is intended for expansion modules with on-board CMOS-RAM. The voltage
of the backup battery can be tapped here to backup the CMOS RAM data of the expansion
module.
Pin no.
Short description
Meaning
Input / Output
1
+
Plus pole
Output
2
-
Minus pole
-
Note
No battery should be connected to this connection.
Pin assignment of the supply for the serial ATA drives X26, X27, X28, X29, X30
Pin no.
Short description
Meaning
Input / Output
1
+12 V
Voltage supply
Output
2
GND
Ground
–
3
GND
Ground
–
4
+5 V
Voltage supply
Output
5
+3.3 V
Voltage supply
Output