ABB AX670 3BSE000566R1 Data transferred by source

Description

The CAN protocol was originally developed for the European automotive industry, so as to replace expensive cabling by an affordable
network cable. Today, it is also used in the field of automation for
transmitting process data between control systems, decentralized
I/O modules, drives, valves, etc. CAN features a high level of transmission security, since large portions of the
monitoring mechanisms have been implemented directly in the CAN chip. DeviceNet and CANopen utilize the
physical structure and the data transport mechanisms of CAN (Controller Area Network). The difference lies in
the transmission protocols. DeviceNet and CANopen can be used correspondingly for the AC500 and AC31
controller series and for field-bus-neutral FBP devices (decentralized I/Os and intelligent switching devices).
Data transmission

Two types of message have been defined: I/O data
transfer and direct link. I/O data transfer is used for
time-critical process data, while the direct link can
be, for example, used for diagnostic messages.
Bus access for subscribers
The connection ID with the lower address has higher
priority on the bus. Data is transmitted by the source,
while the sinks (i.e. receivers of the data) have likewise been specified during the configuration phase.

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