CANopen and industrial fieldbus: where the object model fits
A practical introduction to CAN frames, CANopen objects, PDOs, SDOs, network management, and the motion-control decisions behind a deployment.
CANopen
CAN-based device and motion-control protocol.
An application-layer protocol and device profile family built on CAN, with standardized object dictionaries, process data objects, service data objects, and network management. It is used for drives, I/O, encoders, and embedded automation.
See also: CAN bus · Motion control
Use the concept: Subnet calculator · Modbus RTU CRC & frame helper · Modbus register decoder & byte-order check
In depth
Modbus polling and timeout budget: calculate the slow path
Estimate serial transaction time, include silent intervals and device response, and prevent offline devices from consuming the entire polling cycle.
Single-pair Ethernet and APL: two wires to the field instrument
How Single-Pair Ethernet and Ethernet-APL bring power and 10 Mbit/s Ethernet to hazardous-area field devices — and what changes in process design.