Simulation of a CAN-based Tractor-Implement Field Bus According to DIN 9684

✍ Scribed by J.W. Hofstee; D. Goense

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 319 KB
• Volume: 68
• Category: Article
• ISSN: 0021-8634
• DOI: 10.1006/jaer.1997.0184

✦ Synopsis

Modern tractors and implements will be equipped increasingly with electronic components together with a field bus for the exchange of information between different tractor and/or implement controllers, task controllers, and a virtual terminal used for communication with the operator. In Germany, a DIN standard (DIN 9684) for such a field bus based on CAN (controller area network) has been developed.

The performance of such a system for process control depends on the load of the bus in relation to how messages are transmitted. A simulation program for a field bus based on the DIN 9684 standard has been developed. This program is used to analyse the influence of the message type used for transfer of setpoints, the procedure by which large amounts of data are transferred and the quantity of data on the time required before a setpoint message arrives at its destination.

The simulation shows that when the setpoint messages are transmitted as ''basic data-process data'' messages, the waiting times will be a few milliseconds. When the setpoint messages are transmitted using ''targeted'' messages, the waiting times can increase to some seconds when, at the same time, large amounts of data are transferred. Therefore, it is important that the message type is properly chosen.