Siemens SIMATIC PC Adapter USB - Page 18

Hardware Design of the PC Adapter USB
PC Adapter USB
4-4 A5E01134250-01
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
NC
NC
NC
NC
NC
NC
M24V
LTG_B
RTSAS
M5V
P24V
LTG_A
Shield
Shield
9-pin subminiature D 9-pin subminiature D
Fig. 2: MPI cable (0.3 m)
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8
3
4
6
5
1
2
7
NC
NC
1M
M
+3,15V
+1,95V
5V
USB
MPI
POW ER
USB
Electronics
24V DC
1
2
3
4
M
U
S
BV1.1 12MBit
/
s
P5
D-
D+
M5
RTSPG
LTG_A
LTG_B
RTSAS
P5V
M5V
M24V
P24V
Shield
PC
p
otential area AS
p
otential 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.