Connecting cables
B.2 20 mA TTY interface on the CP 341-20mA-TTY
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 229
Block diagram
The figure below shows the block diagram for a 20mA-TTY interface.
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Figure B-7 Block diagram for the 20mA-TTY interface
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.
In the following
On the following pages you will find examples of connecting cables for a point-to-point
connection between the CP 341-20mA-TTY and S7 modules or SIMATIC S5.
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