#devicenet

Controller Area Network (CAN Bus) Tutorial - Higher Layer Protocols

Even though highly influential in automobiles and small applications, the CAN Bus technology alone is not suitable for machine automation since its communication between devices is limited to only 8 bytes.

Consequently, higher layer protocols such as CANopen for machine control, DeviceNet for factory automation, and SAE J1939 for offroad vehicles (specifically diesel engines) were designed to provide a full networking technology supporting messages of unlimited length and allowing a master/slave configuration.

It is mainly defined as international standard development and trading organization where members are included to lead automation providers worldwide. The task is seen by ODVA (Open DeviceNet Vendors Association) as a promotion for open and compatible information and communication technologies in an automation technology world.

The standards are included in the media-independent network…

What is #DeviceNet?

As we know there are three open network standards- DeviceNet, ControlNet and EtherNet/IP. A common application layer is mainly used by all of them, known as “Common Industrial Protocol”.

The DeviceNet application is one of the main fields in factory automation with I/O modules, valves, encoders, simple drives and controls i.e. PLC. In the CIP (Common Industrial Protocol) network family,…

What is #EtherNet/IP?

The protocol was originally developed by Rockwell Automation and managed now by the Open Device Net Vendors Association (ODVA). It is a well-established Industrial Ethernet communication system with good Real-Time capabilities. The presence strongly can be found in America and Asia. It has been mainly selected by General Motors as a communication system which is a plant-wide for all GM factories…

Quick Reference: Controller Area Network - CAN Bus - Versus Industrial Ethernet

At first glance, a comparison of the two networking technologies, Controller Area Network (CAN Bus) and Industrial Ethernet may appear as a battle between David and Goliath. On one side, you have the clear underdog, CAN Bus with its 1 Mbit/sec baud rate, its limited network length, and a maximum data length of 8 bytes per message. Compare that to the various Industrial Ethernet solutions (such as Ethernet I/P, EtherCAT, ProfiNet, Ethernet Powerlink, Modbus-TCP, and Sercos III) with its 100 Mbit/sec (and even up to 1000 Mbit/sec) transmission rate, unlimited data packages, and a (virtually) unlimited physical network length.

What is the main feature of #CAN protocol?

The high ability to detect transmission errors is one of the main features of CAN protocol, resulted in coping with very high standards for control devices networking within vehicles. The detection of error is considered to be its high capability which can be achieved by combining several measures.

The bus level can be monitored by using one of the effective measures which can be done by the…