MODBUS通讯触发是否需要延时?
系统配置:1214PLC,6ES7 214-1AG40-0XB0 (V4.2)
CM1241,6ES7 241-1CH32-0XB0 (V2.2)
程序:TIA V14
网络结构: 现场客户采用星形连接,硬件30个RFID,程序多配置了两个
读取从站触发信号延时小于50ms就会出现间歇性报错,端口重试500ms和1s设置一样,不加定时器也报错。
调试测试如下图:
![](/club/bbs/upload/image/20200709/6372991287083422442858320.jpg)
![](/club/bbs/upload/image/20200709/6372991287595922506725937.jpg)
![](/club/bbs/upload/image/20200709/6372991288706860198033103.jpg)
![](/club/bbs/upload/image/20200709/6372991289278739461084622.jpg)
![](/club/bbs/upload/image/20200709/6372991289966259447150937.jpg)
![](/club/bbs/upload/image/20200709/6372991293416234604210993.jpg)
![](/club/bbs/upload/image/20200709/6372991294450827383918042.jpg)
![](/club/bbs/upload/image/20200709/6372991295502665132339479.jpg)
![](/club/bbs/upload/image/20200709/6372991296213197031633506.jpg)
![](/club/bbs/upload/image/20200709/6372991296789675004372760.jpg)
![](/club/bbs/upload/image/20200709/6372991297405324024824868.jpg)
困惑:
1.在有些场合也有星形接法,此现象是接线原因导致的,还是RFID的响应太慢,为什么一定要加定时器?
2.MODBUS RTU在软件中的两个版本有啥不一样,老的根本通不上,新的可以,是不是协议版本不一样,是否有标准文档?