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M12 circular connector, Nine pole d-sub, Profibus cabeling – BECKHOFF BK3xx0 User Manual

Page 24: Profibus connection, M12 socket pin assignment, D-sub socket pin assignment

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Notes on the Documentation

22

Fieldbus Components

PROFIBUS Cabeling

PROFIBUS Connection

M12 circular connector

The M12 socket is inverse coded, and has five pins. Pin 1 is 5 V

DC

and 3 is GND for the active termination resistor.

These must never be misused for other functions, as this can lead to destruction of the device. Pin 2 and pin 4 are
the Profibus signals. These must never be swapped over, as this will prevent communication. Pin 5 is the shield, and
this is capacitatively coupled to the Fieldbus Box chassis.

M12 socket pin assignment

Nine pole D-Sub

Pin 6 is 5 V

DC

und Pin 5 is GND for the active termination resistor. These must never be misused for other functions,

as this can lead to destruction of the device. Pin 3 and pin 8 are the Profibus signals. These must never be swapped
over, as this will prevent communication. Shield is connected to the D-Sub housing that is coupled with low-
resistance to the mounting rail.

D-Sub socket pin assignment