CAN BUS network
105
Examples of different network versions
Key to symbols:
… device with its own power supply (UVR1611K, UVR1611S, UVR1611E, UVR16x2)
… device is supplied by the BUS (CAN I/O, CAN-MT, …)
… CAN BUS converter (CAN-BC/C)
… terminated (end devices)
… open termination
… CAN BUS surge arrester
. .. gas discharge arrester for indirect earthing
"Small" network (within one building):
Maximum cable length: 1000 m with corresponding cross-section
The screen must be continued at each network node and be connected to the device earth (GND).
The screen earthing or GND must only be implemented
indirectly
via a gas discharge arrester.
Ensure that no unintentional
direct
connection of earth or screen and the earth potential is created
(e.g. via sensors and the earthed pipework).
Network (across several buildings) without CAN-BC:
Maximum cable length: 1000 m with corresponding cross-section
The screen must be continued at every network node and be earthed at a
single
point. We recom-
mend earthing the screen
indirectly
in the other buildings using a gas discharge arrester. The screen
is
not
connected with the earth (GND) of the devices.
te
rm
o
p
en
Indirect earthing (optional)
Screen
Screen
Screen
indirect earthing
optional
optional
indirect earthing
optional
