Communication manual 8400 motec CANopen
Installation
Electrical installation
28 L EDS84DMOTCAN EN 3.0 - 11/2011
Consider the use of repeaters
Conclusion:
A cable length of 450 m is not possible without installing a repeater.
After 360 m (step 2), a repeater must be installed.
Result:
The Lenze repeater, type 2176 (cable reduction: 30 m), is used
Calculation of the max. cable length:
– First segment: 360 m
– Second segment: 360 m (according to the table Segment cable length
[5-2] ( 27))
minus 30 m (cable reduction when a repeater is used)
Max. possible cable length with one repeater: 690 m
– Now the required cable length is possible.
Note!
The use of an additional repeater is recommended as:
• Service interface
– Advantage: Trouble-free connecting during ongoing bus operation is
possible.
• Calibration interface
– Advantage: Calibration/programming units remain electrically isolated.
Given
• Baud rate: 125 kbps
• Cable cross-section: 0.5 mm
2
• Number of nodes: 28
• Cable length: 450 m
Steps Cable length See
1 Total cable length at 125 kbps: 600 m Table Total cable length
[5-1] ( 26)
2 Segment cable length for 28 nodes and a
cable cross-section of 0.5 mm
2
:
360 m Table Segment cable length
[5-2]
( 27)
3 Comparison: The value determined in
step 2 is smaller than the required cable
length of 450 m.
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