3HNA025019-001 ABB Robot Spraying board process I / O board

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3HNA025019-001 ABB Robot Spraying board process I / O board
3HNA025019-001 ABB Robot Spraying board process I / O board
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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-busneutral FBP devices (decentralized I/Os and intelligent switching devices), via the
CANopen-FBP plug connector.
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 like wise
been specified during the configuration phase.
CANopen
The bus operates on the master/slave principle with one master and up to 127
slaves. A shielded twisted-pair cable is used, according to ISO 11898. Cable
lengths and transmission rates: from max. 40 m at
1 MBit/s to 1000 m at 20 kBit/s.
DeviceNet
The bus operates on the multi-master and/or the master/slave principle, with up
to 64 bus subscribers. Two types of shielded twisted-pair cables are used: trunk
cable for the main line and drop cable for the branch line.