Lenze CANopen EMF2178IB Instructions De Montage page 63

Checking the use of repeaters
Compare the values derived from Tab. 1 Total cable length (^ 61) and Tab. 2 Segment cable
length (^ 62).
ƒ 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.
ƒ 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.
ƒ 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
Number of nodes
Cable cross−section
Baud rate
Repeater used
Reduction of the max. total cable
length per repeater (EMF2176IB)
Results
Max. total cable length
Max. segment cable length
Comparison
Conclusion
EDKMF2178IB DE/EN/FR 6.1
Electrical installation
Wiring of system bus (CAN)
450 m
32
2
0.50 mm (AWG 20)
125 kbps
Lenze repeater EMF2176IB
30 m
630 m
(see Tab. 1 Total cable length (^ 61))
360 m
(see Tab. 2 Segment cable length (^ 62))
The max. segment cable length is smaller than the total
cable length to be implemented.
A repeater must be installed at the determined max.
segment cable length of 360 m.
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