無協(xié)議通信在空調(diào)系統(tǒng)監(jiān)控中的應(yīng)用

無協(xié)議通信在空調(diào)系統(tǒng)監(jiān)控中的應(yīng)用
Application of Non一protocolC ommunicationin S upervision of Air-conditioning System

摘要:MODBUS是用于控制設(shè)備的一種通用串行通信協(xié)議。簡要介紹MODBUS協(xié)議以及PL(:與變頻器之間進(jìn)行無協(xié)議通信的方法;討論循環(huán)冗余校驗(yàn)碼(CRC16)的生成方法，并設(shè)計(jì)PLC計(jì)算CRC16的子程序。給出了一臺歐姆龍小型PLC，使用RS-422A總線，通過無協(xié)議通信的方式集中監(jiān)控空調(diào)系統(tǒng)多臺分散變頻器的工程實(shí)例。實(shí)際應(yīng)用表明，該方法簡單易行、可靠性高、控制效果良好、經(jīng)濟(jì)實(shí)用。
關(guān)鍵詞:無協(xié)議通信 變頻器 空調(diào)系統(tǒng) 監(jiān)控 MODBUS協(xié)議
Abstract: MODBUS is a universal serial communication protocol used in controlling devices. The MODBUS protocol and the method of nonprotocol communication between PLC and inverter are introduced. The creation method of cyclic redundancy check code(CRC16)was discussed and the calculation subroutine of CRC16 by PLC was designed. An example of application that several distributed inverters in air-conditioningsystem monitored by one OMRON pocket PLC through non-protocol communication via RS-422A bus was given. The practice indicates that this method is convenient, reliable and economical.
Keywords:N on-protocolco mmunication Inverter Air-conditionings ystem Supervision MODBUS protol