Technical data

Hardware Information
6-34
SIMATIC Panel PC 670 Computing Unit Equipment Manual
Edition 12/01
Connections for CPU fans (X28)
The CPU fan and the device fan are connected using these two ports.
Pin No. Signal
1 12V temperature-controlled
2 0 V fan, switched
Connection for backup battery (X42)
The battery for backing up the CMOS RAM is connected to this port. The battery
used is a 3.6 V lithium battery with a capacity of 750 mAh.
Pin No. Signal Meaning
1 + Positive
2 – Negative