This paper introduces an RS-422 network system used in the main drive of BOPP film production line. The network uses Mitsubishi FXzPLC and FX2N-485BD communication board as the master station, and Eurotherm 590 series full digital DC speed regulator as the slave station. This paper analyzes the characteristics of the serial communication interface of FX2N-485BD and 590 speed regulator, analyzes the communication protocol of 590 speed regulator, and designs FX2PLC communication software. This technology has been successfully applied to actual engineering projects. Practice shows that this method is simple and feasible, with high reliability and good promotion and application value.
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