IntermediateTopic 51 of 102Manufacturing, Robotics & Systems
Industrial networks
Profibus, EtherCAT and Modbus connect devices.
In depth
Industrial networks connect PLCs, drives, sensors and HMIs: fieldbus (Profibus, Modbus RTU, CANopen, DeviceNet) and industrial Ethernet (PROFINET, EtherNet/IP, EtherCAT, Modbus TCP). Features: determinism, topology, cabling, diagnostics. OPC UA provides vendor-neutral information modelling.
Key points
- Cycle time
- Redundancy rings
- Security segmentation
ExampleEtherCAT synchronises dozens of servo drives within microseconds.
What is Industrial networks?
Profibus, EtherCAT and Modbus connect devices.
Why is it important to understand industrial networks?
Industrial networks connect controllers, drives and sensors reliably, so information can be shared and acted on in real time.
What is the difference between Modbus and EtherCAT?
Modbus is simple and widely supported but slow, while EtherCAT is a high-speed real-time Ethernet protocol for motion control.
Why does industrial networking need determinism?
Control loops must receive data within a fixed time, so networks are designed to avoid unpredictable delays.
How is Industrial networks used in practice?
Typical applications include connecting a robot controller to a set of drives over EtherCAT, using Modbus to read energy meters across a plant and linking a PLC to a remote I/O module on Profibus.
What should I learn before Industrial networks?
Study "Sensors in automation" first (topic 50 of 102 in Manufacturing, Robotics & Systems). It covers the groundwork this topic builds on.
What are the key points of Industrial networks?
Cycle time. Redundancy rings. Security segmentation.
Can you give an example of Industrial networks?
EtherCAT synchronises dozens of servo drives within microseconds.
What comes after Industrial networks?
The next topic is "Introduction to robotics", which builds directly on this one.
How difficult is Industrial networks?
It is classed as Intermediate in Manufacturing, Robotics & Systems (topic 51 of 102). It is an intermediate topic. Work through the beginner topics in Manufacturing, Robotics & Systems first.