DSDI 451 DSDI 452
DSDI 451 DSDI 452
[关键词] 现场总线;以太网通信;DCS;电气控制系统 ;PLC; 机电控制系统;监测控制系统
关键词:PLC可编程控制系统,分散控制系统(DCS)安全仪表系统(SIS),ESD系统,振动监测系统,汽轮机控制 压缩机组控制系统(CCS)等各类工控系统部件
+1 7 7 8 6 0 3 2 5 1 6 微号 扣扣+2 1 7 7 4 9 6 9 4 6
·控制要求
在自由口通信模式下,实现一台本地PLC(CPU224)与一台远程PLC(CPU224)之间的数据通信。本地PLC接收远程PLC 20个字节数据,接收完成后,信息再发回对方。
·硬件要求
本例的硬件要求为:两台CPU224;网络连接器两个,其中一个带编程口;网络线两根(其中一根PPI电缆)。
·参数设置
CPU224通信口设置为自由口通信模式。
通信协议为:波特率为9.6 kb/s,无奇偶校验,每字符8位。
接收和发送用一个数据缓冲区,首地址为VB100。
·程序
主程序如图10-19所示。实现的功能是初始化通信口为自由口模式,建立数据缓冲区,建立中断联系,并允许全局中断。中断程序INT0如图10-20所示,当接收完成后,启动发送命令,将信息发回对方。中断程序INT1,当发回对方的信息结束时,显示任务完成,通信结束
获取通信口地址指令GET ADDR(Get Port Address)用来读取PORT指定的CPU口的站地址,并将数值放入ADDR指定的地址中。
使ENO=0的错误条件:SM4.3(运行时间),0006(间接地址)。
设置通信口地址指令SET ADDR(Set Port Address)用来将通信口站地址(PORT)设置为ADDR指定的数值。新地址不能{yj}保存,断电后又上电,通信口地址仍将恢复为上次的地址值(用系统块下载的地址)。
使ENO=0的错误条件:SM4.3(运行时间),0006(间接寻址)。
上述4条指令中的TBL、PORT和ADDR均为字节型,PORT为常数。
关键词:PLC可编程控制系统,分散控制系统(DCS)安全仪表系统(SIS),ESD系统,振动监测系统,汽轮机控制 压缩机组控制系统(CCS)等各类工控系统部件
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