I/O Terminal /
MOUNTING AND WIRING
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3.4.4 Electrical Isolation
The Bus Coupler / Bus Terminal Controller operate by means of three independent potential
groups. The supply voltage feeds the Standard-Bus electronics and the Standard-Bus itself. The
supply voltage is also used to generate the operating voltage for the fieldbus interface.
Remark: All the Bus Terminals are electrically isolated from the Standard-Bus. The Standard-Bus
is thus electrically isolated from everything else.
3.5 PROFIBUS
Connection
This section provides information about the PROFIBUS connection for the PROFIBUS
Coupler.
3.5.1 M12 Circular Connector
The M12 socket is inverse coded, and has five pins. Pin 1 is 5 VDC 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