CANopen, a kind of communication protocols,
is based on the intelligent field bus (CAN bus). It was developed
as a standardized embedded network with highly flexible configuration
capabilities. It provides standardized communication objects
for real-time data (Process Data Objects, PDO), configuration
data (Service Data Objects, SDO), network management data (NMT
message, and Error Control), and special functions (Time Stamp,
Sync message, and Emergency message). By now, CANopen is used
in many various application fields, such as medical equipment,
off-road vehicles, maritime electronics, public transportation,
building automation and etc.
I-8421 main control unit is specially designed for the slave
device of CANopen protocol. It follows the CANopen Spec DS-301
V4.01 and DSP-401 V2.1, and supplies many features for users,
such as dynamic PDO, EMCY object, error output value, SYNC cyclic
and acyclic, … and etc. In order to expand I/O channel more
flexible, an I-8421 supports up to 4 slots for I/O expansion
and suits with a lot of ICPDAS DI/AI/DO/AO
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