小弟现在做一个导师给的项目，一台S7-200CPU226；10台单片机分站，用的华邦单片机和MAX1480B。主从模式。
在监视单片机自由口的数据时，经常出现PLC有一串数据发不出去或者数据不全、错误的问题，想求教下是什么原因？（目前只挂了2台分站）
哪位工程师有空的话求加下QQ1015696680，向您求教下。。下面是监测到的部分数据，拜谢各位
EE 01 FE 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00 ：PLC向1站要数据
01 FE 00 05 00 00 00 00 00 00 00 00 00 01 A5 3C 3C 14 14 ：1站返回的数据
20 00 00 00 00 ：PLC向2站发的。。。。
EE 03 FC 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00 ：PLC向3站要数据
EE 04 FB 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00
FE ：PLC要5站的那串。。。
EE 06 F9 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00
EE 07 F8 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00 ：PLC要完7站没有8站。
EE 09 F6 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00
EE 0A F5 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00
EE 01 FE 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00 ：这2对数是正确的
01 FE 00 05 00 00 00 00 00 00 00 00 00 01 A5 3C 3C 14 14
EE 02 FD 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00
02 FD 00 00 00 00 00 00 00 00 00 00 00 02 A1 3C 3C 14 14
40 00 00 ：PLC没有了向3站和4站要数据的串
EE 05 FA 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00
EE 06 F9 55 00 CC 3C 3C 00 00 14 14 00 00 55 08 05 00 00 00 00 00 00 00