78
System malfunctions
continued
Causes
Note
Prior to systematic malfunction analysis please check the following:
Wiring:
Does the wiring correspond to the wiring diagram?
Is the bus line polarity correct throughout?
Is the bus line for each of the end devices complete with a resistance of 120 Ω?
Node ID:
Are the node IDs set correctly?
Node IDs must not be doubly assigned.
Baud rate:
Does the cable length correspond to the set baud rate?
(If the baud rate is incorrectly set, the URB 2 emits an acoustic signal.)
Is the baud rate the same for all equipment?
System malfunctions occur if CAN bus components have been incorrectly assembled or configured, if
the device overheats, if there is interference in the supply network or if the electronic components are
faulty.
Other systems malfunctions include:
n
Communication errors in the CAN bus system
n
Overloading of the 24V power supply unit in the
control equipment
Important
Further information about possible system malfunctions can be found in the user’s manual
for the connected equipment.
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