Various kinds of communication buses also play a very important role in the process of digitalization of AC speed regulation. STD bus, industrial PC bus, field bus and CAN bus and other AC drive system automation applications played an important role.
The new universal inverter can provide a variety of compatible communication interface, supports a variety of different communication protocols, built-in RS485 interface, from the personal computer to the common inverter input run commands and set function code data, etc., through the option with the field bus : Profibus-DP, Interbus-S, DevICeNet, Modbus, Plus, CC-Link, LONWORKS, Ethernet, CAN, Open, T-LINK and other communications. Universal frequency inverters such as Siemens, VACON, Fuji, Hitachi, Mitsubishi, General Motors, Taian, Toyo and others all support several or all of these types of fieldbus with their respective options available.
The development of computer networks, so that the "End of the World if your hand", rely on computer networks for remote control of the drive is also a direction of development. Through the RS485 interface and some network protocols for remote control of the inverter, so that some are not suitable for human-site operation of the occasion, but also can be very easy to achieve control objectives.
Digital network functions are the highlights of the international inverter show in recent years, including AB's PF series of inverters, have provided network access solutions, such as the latest PowerFlex4 drive with built-in RS485 communication capabilities, can be used in a variety of Network connection, while PowerFlex4 drives can be programmed and controlled via a microcomputer equipped with DriveExplorerTM or DriveExecutiveTM software.
As an implementing agency, the inverter's network configuration is mainly based on three levels: device layer, control layer and information layer. Can be connected with the most basic RS232 / RS485 serial communication protocol, PROFIBUS and other fieldbus protocols and INTERNET LAN protocol.
In the increasingly popular network today, with the common point-to-point hard-wired connection, the inverter system connected by high-speed communication can minimize system maintenance time, improve production efficiency and reduce operating costs. Currently installed fieldbus modules ProfibusDP, Interbus, DeviceNet, CANOpen and ModbusPlus and so on. Users have greater freedom to choose PLC models and brands based on the manufacturing process and integrate very easily into existing networks. And through the fieldbus module, can not consider the inverter model, but in the same programming language and program structure with different power segments, different types of inverter structure, such as power, speed, torque, current, set Value and so on.
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