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Industrial Networks

Course 4
From Fieldbus to Industrial Networks
 
How to allow multiple devices to effectively communicate
 
Fieldbuses are industrial communication systems that, using either cables, optical fibres or radio waves for signal transmission, connect field devices to a central control system.
 
Fieldbus technology was developed in the 80s to replace traditional cabling systems and the analog transmission of signals with digital technologies. Moreover, fieldbuses create the basic framework for designing distributed control systems.
 
Due to different industrial requirements and to many proprietary solutions offered by the main suppliers, several fieldbus systems are now available on the market. The fundamentl technologies are described by IEC 61158 e IEC 61784 standards.
 
The lesson shows an overview on most popular fieldbus protocols, from simple serial lines to the Ethernet and the wireless systems, explaining selection criteria and the capabilities of the different communication solutions.
 
Targets
 
 To design, deploy and optimize an industrial communication system based on fieldbuses or Ethernet
 To recognize the features, the benefits and the limitations of every fieldbus technology
 To know the most advanced communication technologies, like those based on wireless and on the Ethernet
 To effectively select a fieldbus
 To know the standards that rule industrial communications
 To obtain an overview on available offer
Suggested duration: 1 or 2 days depending on the depth to be reached.
 
 
 
Agenda
 
1. Serial communication 
1.1 Syncrhonous and asynchronous systems 
1.2 Communication codes 
1.3 Ascii code 
1.4 Start/stop protocols 
1.5 RS232/422/485 interfaces 
1.6 Handshaking 
1.7 Peer-to-peer and client-server techniques
 
2. Main fieldbuses 
2.1 From point-to-point communication to multipoint communication 
2.2 As-interface: a sensor bus 
2.3 Interbus S: an historical bus 
2.4 Modbus: the ‘de facto’ standard 
2.5 CANopen: the bus coming from automotive 
2.6 Profibus: the most popular bus 
2.7 Devicenet: for high-performance applications 
2.8 Foundation Fieldbus: the bus for process industry 
2.9 Other protocols: p-net, Sercos, etc.
 
3. Wireless technologies 
3.1 Benefits and limitations compared to wired solutions 
3.2 ZigBee: a fast growing protocol 
3.3 Wireless Hart: for process industry 
3.4 Bluetooth: for short distances 
3.5 Other protocols: WiFi, Wlan, etc.
 
4. Fieldbuses and safety 
4.1 Safety in communications 
4.2 ProfiSafe: combining Profibus with satefy 
4.3 SafetyBus: a very popular protocol 
4.4 Other solutions for safety
 
5.Industrial Ethernet
5.1 The benefits of Ethernet, from offices to industrial plants 
5.2 Ethernet and the ISO/OSI model 
5.3 The CSMA/CD arbitration 
5.4 Ethernet/IP: a very popular protocol 
5.5 Powerlink: an open protocol 
5.6 EtherCAT: high performance protocol
 
6. Application examples
 
7. Conclusions 
7.1 Multiple architectures 
7.2 Routers, bridges and gateways 
7.3 FDT soltuion: a common platform 
7.4 Communication through the Internet 
7.5 How to select the fieldbus most suited to a specific application