用梯形图语言编写通讯校验程序

Compile A Program of Communication-checkout With Echelon-chart Language

PLC与上位机通讯存在错误码问题,用梯形图语言计算CRC校验码,将数据和通讯校验码一并传送上位机,上位机计算校验码CRC后,判别接收数据正误,决定放弃或使用数据,解决了通讯存在的错误码问题。

Since there has been error-co de in communication of PLC and epigyny-computer, we have solved the error-cod e by carrying data and communication-checkout of CRC of echelon-chart language , and following let epigyny-computer calculate CRC, distinguishing correct or e rror of receiving data and deciding give up or use these data.