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.
Branches are not allowed in a CAN network. Stubs should be avoided or kept
as short as possible (< 0.3 m).
When connecting the cable take care to use one dedicated twisted pair for
the CAN signals (CAN_L and CAN_H) and another free wire for CAN_GND.
CAN_GND must be connected as reference, to avoid common mode problems
causing telegram errors.
Keep the CAN bus wiring away from electrical disturbance and close to earth
potential to minimize interference.
Installation hint
System assembly, construction and connection
AC500 (Standard) > Connection and wiring
2022/01/31
3ADR010278, 3, en_US
996
