Communication Network Components - Siemens Simatic S7-200 System Manual

Network Communications and the S7-200 CPU
9.2

Communication Network Components

The communication port on each S7-200 enables you to connect it to a network bus. The
information below describes this port, the connectors for the network bus, the network cable,
and repeaters used to extend the network.
Communication Port
The communication ports on the S7-200 CPUs are RS-485 compatible on a nine-pin
subminiature D connector in accordance with the PROFIBUS standard as defined in the
European Standard EN 50170. Figure 9-2 shows the connector that provides the physical
connection for the communication port, and Table 9-3 describes the signals.
Figure 9-2
Table 9-3
Socket
1
2
3
4
5
6
7
8
9
Connector
shell
1
V =3.5 V, 1.6 mA, V
OH
2
Signals A, B, and Request-to-Send on DP port are isolated from CPU logic and referenced to this isolated 5 V
return.
9-6
Socket 5
Socket 9
Pin Assignment for the S7-200 CPU Communication Port
S7-200 Communication Port Pin Assignments
PROFIBUS Port 0 and Port 1
Designation
Shield Logic common
24 V Return Logic common
RS-485 Signal B RS-485 Signal B
Request-to-Send No connection
5 V Return Logic common
+5 V, 100 Ω series limit
+5 V
+24 V +24 V
RS-485 Signal A RS-485 Signal A
Not applicable No connection
Logic common (CPU 212/214)
Shield
Chassis ground (CPU 215/216)
=0.6 V, 1.6 mA, Signal = V
OL
Socket 1
Socket 6
DP Port
Logic common
Logic common
RS-485 Signal B
Request-to-send
Isolated +5 V Return
Isolated +5 V, 90 mA
+24 V
RS-485 Signal A
No connection
Chassis ground
when the CPU is sending.
OH
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02
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