Schneider Electric IP67 Example, Min interval 0.6 * 7 m 23 ft Min interval 4.2 m 13.8 ft

		CANopen Network Interface
Example	The following illustration shows the calculation of the length of a cable located
	between two tap junction boxes.
	1

2

3

4

1m (3 ft)

1 m	3 m
(3 ft)	(10 ft)

ΣL=5 m (16 ft)

1m (3 ft)

3 m	3 m
(10 ft)	(10 ft)

ΣL=7 m (23 ft)

Min interval > 0.6 * 7 m (23 ft)

Min interval > 4.2 m (13.8 ft)

The table below describes the components of a CANopen network:

Number	Description
1	Connected CANopen devices
2	Drop cables (tap junction box / device)
3	Tap junction boxes
4	Connection cables (tap junction box / tap junction box)

In this example, we have two tap junction boxes and 6 devices. We start by calculating the sum of the lengths of cables for each tap junction box, and we obtain

5m (16 ft) and 7 m (23 ft). We keep the longest length, i.e. 7 m (23 ft). The minimum length of the cable between the two tap junction boxes is equal to 60% of 7 m, i.e. 4.2 m (13.8 ft).

	Number of	In addition to the length limitations over the whole of the CANopen bus, the following
	Connected	limitations apply:
	Devices	Whatever the case, no more than 64 devices may be connected on the same
		segment.
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1606218 02 08/2006			41