Length of seg-
ment [m]
Bus cable (shielded, twisted pair) Max. baud rate
[kbit/s]
Conductor
cross section
[mm²]
Line resistance
[W/km]
Wave impe-
dance [W]
0...40 0.25...0.34 /
AWG23, AWG22
70 120 1000 at 40 m
40...300 0.34...0.60 /
AWG22, AWG20
< 60 120 < 500 at 100 m
300...600 0.50...0.60 /
AWG20
< 40 120 < 100 at 500 m
600...1000 0.75...0.80 /
AWG18
< 26 120 < 50 at 1000 m
NOTICE!
Risk of telegram and data errors!
The use of wrong cable type and quality could lead to limitations in cable length,
causing telegram and data errors.
NOTICE!
Risk of damaging the terminating resistor!
A bus-line short-circuit to the 24 VDC power supply can cause damage by
exceeding the power rating of the terminating resistor.
NOTICE!
Risk of telegram and data errors!
Miss- or unterminated data lines can cause reflections on the bus, leading to
telegram and data errors. For maximum cable length and transmission rate, the
bus must always be terminated on both ends with the characteristic impedance
of the cable type.
NOTICE!
Verification of termination (Make sure the power supply on all CAN nodes
is turned off)!
To verify the termination, the DC resistance between CAN_H and CAN_L can
be measured. The value should be between 50 W and 70 W.
Check for correct resistor values, short circuits and correct number of termi-
nating resistors, if the measurement is showing deviations.
Ensure that the termination and FE connection will not be removed when
removing CAN modules from the bus.
Installation Hint
System Assembly, Construction and Connection
AC500 (Standard) > Connection and Wiring
2019/04/17 3ADR010121, 13, en_US 1287
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