Wiring
EPPC-405-HR
Manual Rev. 1.1
21
Wire Length
Optical couplers are delaying the CAN signals. By using fast optical couplers and testing each
board at 1 Mbit/s, however, esd CAN guarantee a reachable length of 37 m at 1 Mbit/s for most
esd CAN modules within a closed net without impedance disturbances like e.g. longer dead-end
feeders. (Exception: CAN-CBM-DIO8, -AI4 and AO4 (these modules work only up to 10 m with
1 Mbit/s))
Bit rate
[Kbit/s]
Typical values of reachable
wire length
with esd
interface
l
max
[m]
CiA recommendations
(07/95) for reachable wire
lengths l
min
[m]
1000
800
666.6
500
333.3
250
166
125
100
66.6
50
33.3
20
12.5
10
37
59
80
130
180
270
420
570
710
1000
1400
2000
3600
5400
7300
25
50
-
100
-
250
-
500
650
-
1000
-
2500
-
5000
Table:
Reachable wire lengths depending on the bit rate when using esd-CAN interfaces
