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E94AYCCA communication manual (CANopen®)
Installation
Electrical installation
30
L
EDS94AYCCA EN 5.0 - 06/2012
5.2.3.3 Checking the use of repeaters
Compare the values derived from tables Total cable length
(

28)
and Segment cable length
(

29)
.

If the sum of the segment cable lengths is smaller than the total cable length to be
implemented, either repeaters must be used or the cable cross-section must be
increased.

If the use of repeaters reduces the max. possible total cable length so much that it is
smaller than the total cable length to be implemented, then the cable cross-section
must be increased or less repeaters must be used or the baud rate must be decreased.

The use of a further repeater is recommended as ...
– service interface
Advantage: trouble-free connection 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 20)
Baud rate 125 kbps
Repeater used Lenze repeater EMF2176IB
Reduction of the max. total cable
length per repeater (EMF2176IB)
30 m
Results
Max. possible total cable length 600 m
(see table Total cable length (

28) )
Max. segment cable length 360 m
(see table Segment cable length (

29) )
Comparison The max. segment cable length is smaller than the total cable length to be
implemented.
Conclusion A repeater must be installed at the determined max. segment cable length
of 360 m.
Results with 1 repeater
Max. possible total cable length 570 m
(Reduction of the Total cable length (

28) by 30 m)
Sum of the segment cable lengths 720 m
Comparison Both the possible total cable length and the segment cable lengths are larger
than the total cable length to be implemented.
Conclusion 1 repeater is sufficient to implement the total cable length of 450 m.