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1-6
User Manual CM-CAN1
1 General introduction
1.5.4 Transmission
speeds
The CAN bus can be operated at the following Baud rates:
When selecting the transfer rate it should, however, be ensured that the
line length does not exceed the permissible line length for the transfer
rate in question.
The following factors influence calculation of the permissible line length:
• Propagation time of the signal on the line
• Signal propagation time of the optocouplers
• Signal propagation time of the gates
The values specified for the line length already include the signal propa-
gation times in the drive unit. For the control, a signal propagation time
from the bus connector to the control's CAN controller of max. 80 ns is
assumed. If these control values are exceeded, the transfer rate must be
reduced by at least one increment!
Transmission speed Maximum line length over the entire network
500 KBaud 100 m Factory setting
250 KBaud 200 m
125 KBaud 450 m
75 KBaud 770 m
50 KBaud 1000 m
25 KBaud 1000 m
Table 1.2 Transmission speeds