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CANopen Network Interface
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1606218 02 08/2006
Tap Length A tap creates a signal reflection and thus its length must be limited to the following
parameters:
Lmax is the maximum length of a tap.
ΣLImax is the maximum value of the sum of all taps on the same tap junction box.
Min interval is the minimum distance necessary between two taps.
ΣLGmaxis the maximum value of the sum of all taps on the segment.
The values to use are given in the following table:
Speed Lmax ΣLImax Min. interval
0.6xΣL local
ΣLGmax
1 Mbits/s 0.3 m (0.98 ft) 0.6 m (1.96 ft) 1.5 m (4.9 ft)
800 Kbits/s 3 m (9.8 ft) 6 m (19.6 ft) 3.6 m (11.8 ft)(*) 15 m (49 ft)
500 Kbits/s 5 m (16.4 ft) 10 m (32.80 ft) 6 m (19.6 ft)(*) 30 m (98.4 ft)
250 Kbits/s 5 m (16.4 ft) 10 m (32.80 ft) 6 m (19.6 ft)(*) 60 m (196.8 ft)
125 Kbits/s 5 m (16.4 ft) 10 m (32.80 ft) 6 m (19.6 ft)(*) 120 m (393.6 ft)
50 Kbits/s 60 m (196.8 ft) 120 m (393.6 ft) 72 m (236 ft)(*) 300 m (984 ft)
20 Kbits/s 150 m (492 ft) 300 m (984 ft) 180 m (590.5 ft)(*) 750 m (2 460.6 ft)
10 Kbits/s 300 m (984 ft) 600 m (1 968.4 ft) 360 m (1 181 ft)(*) 1 500 m (4 921 ft)
Legend:
(*) The minimum cable length between two consecutive tap junction boxes must be greater than 60% of the largest
of the two sums of the lengths of taps on each of the two boxes.