Profibus Cabling; Fig. 18 Pin Assignment M12 Socket (-B310); Fig. 19 Pin Assignment M12 Socket/Plug Connector (-B318); Fig. 20 Pin Assignment Of The Profibus D-Sub Socket - Beckhoff BK3 0 Series Documentation

3.4.5

PROFIBUS cabling

3.4.5.1 PROFIBUS Connection
M12 round connector
The M12 socket is inverse-coded and has five pins. Pin 1 transfers 5 V
termination resistor. These must never be misused for other functions, as this can lead to destruction of the
device.
Pins 2 and 4 transfer the PROFIBUS signals. These must never be swapped over, as this will prevent
communication. Pin 5 transfers the shield, which is capacitively connected to the base of the Fieldbus Box.
Pin assignment M12 socket (-B310)
Fig. 18: Pin assignment M12 socket (-B310)
Pin assignment M12 socket/plug connector (-B318)
Fig. 19: Pin assignment M12 socket/plug connector (-B318)
Nine-pin D-Sub
Pin 6 transfers 5 V pin 5 transfers GND for the active termination resistor. These must never be misused
DC,
for other functions, as this can lead to destruction of the device.
Pins 3 and 8 transfer the PROFIBUS signals. These must never be swapped over, as this will prevent
communication.
Pin assignment of the PROFIBUS D-sub socket
Fig. 20: Pin assignment of the PROFIBUS D-sub socket
PROFIBUS wire colors
PROFIBUS line
B red
A green
BK3xx0
M12
Pin 4
Pin 2
Version: 4.3.0
Mounting and wiring
pin 3 transfers GND for the active
DC,
D-Sub
Pin 3
Pin 8
29