Siemens SIMATIC IPC647D Operating Instructions Manual page 17

The figure below shows the SAS data cable.
①
②
The installed RAID controller for the "Adaptec RAID ASR8405" module is displayed as
follows in the BIOS:
SIMATIC IPC647D/847D Hardware RAID Configuration
Compact Operating Instructions, 08/2014, A5E34655907-AA
Connection for the Hardware RAID adapter card
Hard disk connections 0-3 (for the removable rack
Commissioning the device
3.3 SAS Hardware RAID system
17