Block Diagram Of The Rs 485 Repeater; Pin Assignment Of The 9-Pin Sub-D Adapter (Pg/Op Interface) - Siemens SIMATIC S5 Manual
Distributed i/o system
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Pin assignment of
The pin assignment of the 9-pin sub-D adapter is as follows:
the sub-D adapter
(PG/OP interface)
Table 6-5 Pin assignment of the 9-pin sub-D adapter (PG/OP interface)
Block diagram
Fig. 6-1 is a block diagram of the RS 485 repeater:
Segment 1
Figure 6-1
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
RS 485 repeaters: installing, connecting and operating
View
Pin No.
Signal
1
–
2
M24V
5
5
3
RxD/TxD-P
9
9
4
4
4
RTS
8
8
3
5
M5V2
7
7
6
P5V2
2
6
6
7
P24V
1
1
8
RxD/TxD-N
9
–
Bus segment 1 and bus segment 2 are galvanically isolated.
Bus segment 2 and the PG/OP interface are galvanically isolated.
Signals are amplified
– between bus segment 1 and bus segment 2
– between PG/OP interface and bus segment 2
A1
Logic
B1
A1
B1
PG/OP
5V
i.face
24V
L+ (24 V)
M
A1
B1
5 V
M5 V
Block diagram of the RS 485 repeater
Designation
–
Ground 24 V
Data line B
Request to send
Data reference potential (from station)
Supply plus (from station)
24 V
Data line A
–
Segment 2
A2
B2
A2
B2
1M
1M
5V
24V
L+ (24 V)
M
PE
M 5.2
6
6-5
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