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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

Siemens SIMATIC HMI IPC677C User Manual

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