SIGMATEK 20-004-313, Operating Manual

Page: 27 / 56

S-DIAS CPU MODULE CP 313
29.05.2020 Page 25
7 CAN Bus Setup
This section explains how to correctly configure the CAN bus. The following parameters
must first be set: Station number and transmission speed.
7.1 CAN Bus Station Number
Each CAN bus station is assigned its own station number. With this station number, data
can be exchanged with other stations connected to the bus. In a CAN bus system however,
each station number can only be assigned once!
7.2 Number of CAN Bus Participants
The maximum number of participants on the CAN bus depends on the cable length,
termination resistance, data transfer rate and the drivers used in the participants.
With a termination resistance of 120

, at least 110 participants are possible.
7.3 CAN Bus Data Transfer Rate
Various data transfer rates (baud rates) can be set on the CAN bus. The longer the bus line
is, the lower the data transfer rate that must be selected.
Value Baud rate maximum length
00 615 kbits/s 60 m
01 500 Kbits/s 80 m
02 250 Kbits/s 160 m
03 125 kbits/s 320 m
04 100 Kbits/s 400 m
05 50 Kbits/s, 800 m
06 20 Kbits/s, 1200 m
07 1 Mbit/s 30 m
These values are valid for the following cable: 120

, Twisted Pair.
Note: For the CAN bus protocol: 1 kbits/s = 1 kBaud