EDS84DMOTCAN EN 3.0 - 11/2011 L 25
Communication manual 8400 motec CANopen
Installation
Electrical installation
A CAN network consisting of several segments contains repeaters (R) for connecting the
segments. The repeaters are provided with integrated bus terminations.
Consider the use of repeaters
( 28)
[5-3] CAN network with repeaters
If no repeater is to be used at the end of the segment, the bus must be terminated by a bus
terminating resistor at the last node (S). The bus termination is supplied by the node itself.
5.2.2 Bus termination
The system bus (CANopen) must be terminated through a bus terminating resistor at the
first and last physical node (120 Ω).
In the case of the communication unit, the bus terminating resistor can only be installed
externally at the M12 connector. This has the advantage that the presence of the resistor
can be identified on the closed device.
E94YCPM012b
M
Z
Z
S SS
Z
Z
Z
Z
1 23
R
S S
R
Note!
• The CANopen terminals (input and output) must be installed so that they are
closed. For this purpose either use a connecting cable, a closed terminating
resistor plug (M12 pins, 5-pole, A-coded), or a cap.
• The connecting cable and terminating resistor plug can be procured freely
from various cable manufacturers (e.g. Lapp or Turck).
• If you want to disconnect individual nodes, ensure that the bus terminations
at the cable ends remain active. Otherwise the bus may become instable.
• Observe that the bus terminator is no longer active when the terminating
resistor plug has been removed.
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