3 check use of repeater, Check use of repeater, Repeater – Lenze CANopen control technology User Manual
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Control technology | CANopen communication manual
Technical data
Bus cable length
24
L
DMS 4.2 EN 07/2011 TD17
5.4.3
Check use of repeater
Compare the values from the tables
.
If the total segment cable length is shorter than the total cable length to be
implemented, either repeaters must be used or the cable cross-section must be
increased.
If, due to the use of repeaters, the max. possible total cable length is reduced to a value
smaller than the total cable length to be implemented, either the cable cross-section
must be increased and the number of repeaters must be reduced or the baud rate must
be reduced.
The use of another repeater is recommended as ...
– Service interface
Advantage: Trouble-free coupling during bus operation is possible.
– Calibration interface
Advantage: The calibration/programming unit remains electrically isolated.
Example
Given
Total cable length to be
implemented
450 m
Number of nodes
32
Cable cross-section
0.50 mm
2
(AWG 21)
Baud rate
125 kbit/s
Used repeater
Lenze repeater EMF2176IB
Reduction of the max. total cable
length per repeater (EMF2176IB)
30 m
Results
Max. possible total cable length
600 m
(cp. table
)
Max. segment cable length
360 m
(cp. table
)
Comparison
The max. segment cable length is shorter than the total cable length to be
implemented.
Conclusion
After the determined max. segment cable length of 360 m at the latest, a
repeater must be used.
Results with 1 repeater
Max. possible total cable length
570 m
(Reduction of the
by 30 m)
Total segment cable length
720 m
Comparison
Both the possible total cable length and the segment cable length are longer
than the total cable length to be implemented.
Conclusion
One repeater suffices to implement the total cable length of 450 m.