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Electrical installation – Lenze EMF2180IB EthernetCAN User Manual

Page 49

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Electrical installation

Connection of system bus (CAN)

6

EDKMF2180 DE/EN/FR/ES/IT 3.0

49

H1_E_INST-SteckerFederkraftAnschluss FKCT

Bus cable length

It is absolutely necessary to comply with the permissible cable lengths.
1. Check the compliance with the total cable length in Tab. 1.
The total cable length is determined by the baud rate.

Baud rate [kbit/s]

Max. bus length [m]

20

3600

50

1400

125

550

250

250

500

110

1000

20

Tab. 1

Total cable length

2. Check the compliance with the segment cable length in Tab. 2.
The segment cable length is determined by the cable cross-section used and by the number
of nodes. Without repeaters the segment cable length corresponds to the total cable length.

Nodes

Cable cross-section

0.25 mm

2

0.5 mm

2

0.75 mm

2

1.0 mm

2

2

240 m

430 m

650 m

940 m

5

230 m

420 m

640 m

920 m

10

230 m

410 m

620 m

900 m

20

210 m

390 m

580 m

850 m

32

200 m

360 m

550 m

800 m

63

170 m

310 m

470 m

690 m

100

150 m

270 m

410 m

600 m

Tab. 2

Segment cable length

3. Compare both values.
If the value given in Tab. 2 is smaller than the required total cable length from Tab. 1,
repeaters must be used. Repeaters divide the total cable length into segments.