IFM Electronic CR0451 - Bus Cable Length

75
ifm System Manual ecomatmobile BasicDisplay (CR0451) V01
CAN in the PDM360 Physical connection of CAN
9.2.3 Bus cable length
1180
The length of the bus cable depends on:
 type of the bus cable (cable, connector),
 cable resistance,
 required transmission rate (baud rate),
 length of the spurs.
To simplify matters, the following dependence between bus length and baud rate can be assumed:
10050 1000 10000
5
10
20
50
100
200
500
1000
Bus-Länge
Bus length
[m]
Baudrate
Baud rate
[kBit/s]
Figure: bus cable length
Baud rate [kBit/s] Bus length [m] Bit length nominal [µs]
1 000 30 1
800 50 1.25
500 100 2
250 250 4
125 500 8
62.5 1 000 20
20 2 500 50
10 5 000 100
Table: Dependencies bus length / baud rate / bit time