Siemens SIMATIC 6ES7 972-0CB20-0XA0 Manual page 18

Hardware Design of the PC Adapter USB
NC
1
2
3
4
5
6
NC
7
8
9 NC
9-pin subminiature D
Fig. 2:
P5 1
USB
D- 2
D+ 3
M5 4
M
Shield
PC potential area
Fig. 3: Block diagram
The MPI/DP and USB interfaces of the PC Adapter USB are electrically isolated
within a safety extra low-voltage circuit (SELV). It can therefore be operated
directly on ungrounded S7/M7/C7 systems.
4-4
13.05.2003 13.05.2003 3.05.2003
13.05.2003
Shield
M24V
LTG_B
RTSAS
M5V
P24V
LTG_A
Shield
9-pin subminiature D
MPI cable (0.3 m)
Electronics
1
NC
2
3
4
5
6
NC
7
8
9
NC
5V
1M
+3,15V
+1,95V
M
AS potential area
9 RTSPG
8 LTG_A
3 LTG_B
4 RTSAS
NC 6 P5V
5 M5V
NC 1
7 P24V
2 M24V
PC Adapter USB
A5E00166353-02