No.7（2012）22.Simulation of Motionnet communication quality and real circuit development

Ken Sato, Hiroyasu Sano, Toru Nonaka, Takashi Terasaki

  Motionnet is a serial communication system for FA developed by Nippon Pulse Motor Co. Ltd. It can connect with up to 64 units with variable cable connection length, speed of communication and flexibility. However, due to its flexibility, confirming the communication waveform distortion before system construction is difficult. Yet there is no guideline for communication quality when developing its base units. To resolve these two problems, we made simulation models of units and cables. The cable-model is variable length. Then sample boards were developed in accordance with the new guide lines. The comparison of simulation and real waveform shows strong similarity. There is a relation between total cable length and communication quality; however there were exceptions for some cable length combinations. The new sample boards decreased emissions by about 20dB.

Keywords
Motionnet, RS-485,Cable, Simulation

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