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222
B7AC Interface Units
Section 5-5
Internal Circuits
3
4
2
3
2
4
1
2
3
1
4
5
DRAIN
V
−
V+
CAN L
CAN H
CN1
1
P
A
B
C
B7AC SIG-IN
3
2
4
1
B7AC SIG-IN
3
2
4
1
B7AC SIG-IN
Communications
connector
Physical
layer
Photo-
coupler
Photo-
coupler
DC-DC
converter
(Not iso-
lated)
DC-DC
converter
(Isolated)
In
te
rnal circuit
ry
P
hot
o-
c
oupler
P
hot
o-
c
oupler
P
hot
o-
c
oupler
Input A power 24 V
24 V (for internal circuits)
0 V (for internal circuits)
External
power supply
connector
Port A
connector
Port B
connector
Port C
connector
B7AC trans. delay switch
Input A power supply 0 V
Input B power 24 V
B7AC trans. delay switch
Input B power supply 0 V
Input C power 24 V
B7AC trans. delay switch
Input C power supply 0 V
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