Beckhoff BK3120 User Manual

Mounting and wiring
BK3xx0 29Version: 4.3.0
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
DC,
pin 3 transfers GND for the active
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
DC,
pin 5 transfers GND for the active termination resistor. These must never be misused
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 M12 D-Sub
B red Pin 4 Pin 3
A green Pin 2 Pin 8

Beckhoff BK3120 Specifications

General

Brand	Beckhoff
Model	BK3120
Category	Adapter
Language	English