Network Components; Communication Port; Pin Assignment For The S7-200 Cpu Communication Port; S7-200 Communication Port Pin Assignments - Siemens SIMATIC S7-200 System Manual

Setting Up Communications Hardware and Network Communications
7.6

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 7-23 shows the connector that
provides the physical connection for the communication port, and Table 7-5
describes the communication port pin assignments. See Appendix A for
information about the EM 277 PROFIBUS-DP module.
Figure 7-23
Table 7-5

S7-200 Communication Port Pin Assignments

Pin Number
1
2
3
4
5
6
7
8
9
Connector shell
7-32
Pin 5
Pin 9

Pin Assignment for the S7-200 CPU Communication Port

PROFIBUS Designation
Shield
24 V Return
RS-485 Signal B
Request-to-Send
5 V Return
+5 V
+24 V
RS-485 Signal A
Not applicable
Shield
Pin 1
Pin 6
Port 0/Port 1
Chassis ground
Logic common
RS-485 Signal B
RTS (TTL)
Logic common
+5 V, 100 Ω series resistor
+24 V
RS-485 Signal A
10-bit protocol select (input)
Chassis ground
S7-200 Programmable Controller System Manual
A5E00066097-02