Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 847B
Operating Instructions, 06/2008, A5E02203168-01
131
PS/2 keyboard interface, X21 1 to 6
PS/2
Pin no. Short name
Meaning
Input / output
1
DAT
Data channel, keyboard Input/output
2
–
Not used
–
3
GND
Ground
–
4
P5VFK
+ 5 V (fused)
Output
5
CLK
Clock channel,
keyboard
Input/output
6
–
Not used
–
USB 2.0 interfaces, X40A, B; X41A, B
USB 2.0 interface
Pinno. Short name
Meaning
Input / output
1
VCC
+ 5 V (fused)
Output
2
– Data
Data channel
Input / output
3
+ Data
Data channel
Input / output
4
GND
Ground
–
The connectors are of type A.
The ports are rated as high-current USB 2.0 (500 mA).