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FCM 300:
FCM 300:
FCM 300:
FCM 300:
FCM 300:
The bus termination
See drawing on page 6
It is essential that the bus line be terminated properly.
A mismatch of impedance may result in reflections
on the line that will corrupt data transmission.
-
The PROFIBUS is provided with a suitable
termination which may be activated by the
switches of the RS485 switch block located
just to the left of the terminal block X100 (see
drawing below). The switches should be on to
terminate the bus.
8
FCM 300 PROFIBUS / VLT 2800 PROFIBUS
The switches should never be left in opposite
positions. They should either both be ON or
both be OFF!
-
Most masters and repeaters are equipped with
their own termination.
-
If an external termination circuit consisting of three
resistors is connected to the bus line a 5 V d.c.
power supply must be used, please note that this
must be galvanically isolated from the a.c. line.
MG.90.A2.02 – VLT is a registered Danfoss trademark
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