1771-OMD
1771-OMD
PLC是一種可編程控制器在多個(gè)行業(yè)中都有一定的應(yīng)用,西門(mén)子PLC是PLC中zui常用的一種。PLC可編程控制器的串口通訊有3種方法,RS485A、PPI通信、MPI,用戶(hù)在使用西門(mén)子變頻器的時(shí)候知道這三種通訊方法的具體意思是什么嗎?下面小編就來(lái)具體介紹一下西門(mén)子PLC串口通訊的3種方法吧。
1、RS485 串口通信
第三方設(shè)備大部分支持,西門(mén)子S7 PLC 可以通過(guò)選擇自由口通信模式控制串口通信。zui簡(jiǎn)單的情況只用發(fā)送指令 (XMT)向打印機(jī)或者變頻器等第三方設(shè)備發(fā)送信息。不管任何情況,都必須通過(guò) S7 PLC編寫(xiě)程序?qū)崿F(xiàn)。當(dāng)選擇了自由口模式,用戶(hù)可以通過(guò)發(fā)送指令(XMT)、接收指(RCV)、發(fā)送中斷、接收中斷來(lái)控制通信口的操作。
2、PPI 通信
PPI 協(xié)議是S7-200CPU zui基本的通信方式,通過(guò)原來(lái)自身的端口 (PORT0 或PORT1)就可以實(shí)現(xiàn)通信,是 S7-200 CPU 默認(rèn)的通信方式。PPI是一種主-從協(xié)議通信,主-從站在一個(gè)令牌環(huán)網(wǎng)中。在CPU內(nèi)用戶(hù)網(wǎng)絡(luò)讀寫(xiě)指令即可,也就是說(shuō)網(wǎng)絡(luò)讀寫(xiě)指令是運(yùn)行在PPI協(xié)議上的。因此 PPI 只在主站側(cè)編寫(xiě)程序就可以了,從站的網(wǎng)絡(luò)讀寫(xiě)指令沒(méi)有什么意義。
3、MPI 通信
MPI通信是一種比簡(jiǎn)單的通信方式,MPI網(wǎng)絡(luò)通信的速率是19.2Kbit/s~12Mbit/s,MPI網(wǎng)絡(luò)zui多支持連接32個(gè)節(jié)點(diǎn),zui大通信距離為50M。通信距離遠(yuǎn),還可以通過(guò)中繼器擴(kuò)展通信距離,但中繼器也占用節(jié)點(diǎn)。MPI網(wǎng)絡(luò)節(jié)點(diǎn)通常可以?huà)霺7-200、人機(jī)介面、編程設(shè)備等。
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