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littelfuse.com
CAN Bus (DeviceNet)
IE and PoE are far from the only communication buses
relied upon for factory automation system coordination.
The CAN Bus standard allows microcontrollers and
devices to communicate with each other in applications
without a host computer. Although not nearly as fast
as Ethernet, CAN Bus is highly robust and capable of
communicating data reliably over substantially longer
distances than Ethernet. That makes it a good choice
for applications that require communicating instructions
Figure 4: The SM24CANB Series TVS Diode Array is designed to
protect CAN Bus and DeviceNet lines from damage due to ESD, EFT,
and surge transients. It's well suited for longer cable runs or cables
that must be located close to power cables. (Source: Littelfuse)
or returning data from separate pieces of equipment
located some distance from each other. Figure 4 shows
a typical CAN Bus application example. The DeviceNet
network is based on CAN bus technology.
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Power can be carried on the
same conductors as the data or
on dedicated conductors in the
same cable.
