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PLC软件设计 （1）PLC与PC的通信及条码识别 PLC与PC之间的通信采用RS-485/RS-232方式，信号的转换由RS-232/RS-485转换器完成。以下简要介绍S7-200系列与自由口功能有关的寄存器SMB2，SMB3，SMB30，它们主要用于自由口通讯方式的确定及运行管理。 控制字寄存器SMB30用于存储通讯方式控制字，由用户写入，属于可读写的特殊标志位寄存器。其格式如下： mm：（通信协议）00 PPI协议（从机） 01 自由口协议 10 PPI协议（主机） 11 保留（缺省为PPI从机） bbb：（波特率） 000~111依次对应38400 bps ~ 300 bps波特率 pp：（校验方式） 00 无校验 01 偶校验 10 无校验 11 奇校验 通讯接收字符缓冲器SMB2用于存放在自由口通讯方式下接收到的当前字符，它是一个暂存寄存器，一般应在下一步取走其中的内容。 通讯校验结果寄存器SMB3，在作自由口通讯时，PLC的通讯接口按由SMB30规定的奇偶校验方式对所接收到的信号作校验。若检测到错误，PLC自动将SMB3.0置1，根据此标志位，可决定当前信息的取舍，同时还可在出错的情况下，将此错误位发送给对方，以便要求它重发。 在S7 226 PLC中，集成了两个RS485数据通讯端口，可使用专用的位通讯协议作波特率高达38.4kbit/s 的高速通讯，并可按步调整。 以下为PLC接收部分程序片段： LD SM0.1 //第一个扫描周期接通 MOVB 9, SMB30 //初始化port0口 ATCH INT_0, 8 //指定port0口接收事件由中断0处理 MOVD &VB101, VD96 //指针VD96指向VB101开始的V寄存器区 MOVD &VB0, VD36 //VD36也指向VB101开始的V寄存器区 MOVB 0, VB41 //接收字符个数清0 下面为中断0片段（接收并存储）： LD SM0.0 //一直接通 MOVB SMB2, *VD36 //只要接收到字符就存入指针VD36所指向的区域， //即VB101开始的V寄存器区 INCD VD36 //指针下移，为接收并存储下一字符作准备 INCB VB41 //字符计数个数加一 当PLC需要向PC传送数据时，可以通过以下代码实现： PLC发送部分程序片段： LD SM0.1 //第一个扫描周期接通 MOVB 9, SMB130 //初始化port1口 MOVB 14, VB100 //将14存入VB100中 XMT VB100,1 //指定port1口发送自VB101开始的V寄存器区， //发送字符个数由VB100的内容决定 以下为PLC接收条码并判断部分： LDB= SMB2, 10 //收到换行符，条码结束 LPS MOVD &VB0, VD36 AB<> VB41, 14 //总共收到条码字符数不等于14，出错， S M0.1, 1 //置位M0.1 LRD AB=VB41, 14 //总共收到条码字符数等于14，正确， R M0.1, 1 //复位M0.1 LPP MOVB 0, VB41 //接收字符个数清0，为下一次接收作准备
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