X27 (Rs 422/485) Interface Of The Cp 340-Rs 422/485 - Siemens SIMATIC CP 340 User Manual

Connecting Cables
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
B.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
Pin assignment
The table below shows the pin assignment for the 15-pin sub D socket in the front panel of
the CP 340-RS 422/485.
Table B- 3 Pin assignment for the 15-pin sub D socket of the integrated interface of the CP 340-RS 422/485
Socket to
CP 340–RS 422/485*
* View from the front
Connecting cables
If you make your own connecting cables you must remember that unconnected inputs at the
communication partner may have to be connected to open-circuit potential.
Please note that you must only use shielded connector casings. A large surface area of both
sides of the cable shield must be in contact with the connector casing. You are advised to
use Siemens V42 254 shielded connector casings.
CAUTION
Never connect the cable shield with the GND, as this could destroy the interface modules.
GND must always be connected on both sides (pin 8), otherwise the interface modules
could again be destroyed.
180
Pin Designation Input/Output
1 - -
2 T (A) - Output
3 - -
4 R (A)/T (A) - Input
Input/output
5 - -
6 - -
7 - -
8 GND -
9 T (B) + Output
10 - -
11 R (B)/T (B) + Input
Input/output
12 - -
13 - -
14 - -
15 - -
Meaning
-
Transmitted data (four-wire mode)
-
Received data (four-wire mode)
Received/transmitted data (two-wire mode)
-
-
-
Functional ground (isolated)
Transmitted data (four-wire mode)
-
Received data (four-wire mode)
Received/transmitted data (two-wire mode)
-
-
-
-
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03