Siemens SIMATIC PC 670 Equipment Manual page 160

Hardware Information
Allocation of IDE intefaces
The primary IDE port is designed for alternatively installing 2.5" and 3.5" hard
disks. 3.5" drives are connected by means of a 40-pin 2.54 mm pitch connector
and 2.5" drives by means of a 44-pin 2 mm pitch connector. The two connectors
are connected in parallel. The secondary IDE port is intended for the optional
connection of a CD ROM and / or an LS 240 drive. It can be adapted using a
44-pin 2 mm pitch connector. The maximum connection length of the data cables
must not be longer than 40 cm.
7-28
Panel PC 670 Computing Unit, Equipment Manual
Release 04/02