1771-OMD
1771-OMD
1771-OMD
PLC是一種可編程控制器在多個行業(yè)中都有一定的應(yīng)用，西門子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，用戶在使用西門子變頻器的時候知道這三種通訊方法的具體意思是什么嗎?下面小編就來具體介紹一下西門子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，西門子S7 PLC 可以通過選擇自由口通信模式控制串口通信。zui簡單的情況只用發(fā)送指令 (XMT)向打印機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 S7 PLC編寫程序?qū)崿F(xiàn)。當選擇了自由口模式，用戶可以通過發(fā)送指令(XMT)、接收指(RCV)、發(fā)送中斷、接收中斷來控制通信口的操作。
2、PPI 通信
PPI 協(xié)議是S7-200CPU zui基本的通信方式，通過原來自身的端口 (PORT0 或PORT1)就可以實現(xiàn)通信，是 S7-200 CPU 默認的通信方式。PPI是一種主-從協(xié)議通信，主-從站在一個令牌環(huán)網(wǎng)中。在CPU內(nèi)用戶網(wǎng)絡(luò)讀寫指令即可，也就是說網(wǎng)絡(luò)讀寫指令是運行在PPI協(xié)議上的。因此 PPI 只在主站側(cè)編寫程序就可以了，從站的網(wǎng)絡(luò)讀寫指令沒有什么意義。
3、MPI 通信
MPI通信是一種比簡單的通信方式，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個節(jié)點，zui大通信距離為50M。通信距離遠，還可以通過中繼器擴展通信距離，但中繼器也占用節(jié)點。MPI網(wǎng)絡(luò)節(jié)點通常可以掛S7-200、人機介面、編程設(shè)備等。
＆公司全稱：廈門泰尼電氣有限公司
＆業(yè)務(wù)：黃東梅《女士》
＆洽談：/
＆ ：2917675397
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＆公司地址：廈門市海滄區(qū)海滄街道濱湖一里7號
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