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1746-OAP12
1746-OAP12
1746-OAP12
控制站软件组态:
控制站的组态用OMRON的系统软件SSS作为技术平台,用梯形图作为编程工具,其组态内容主要有:
2.4.1.PLC内部地址的分配:
I/O 地址的分配:PLC的I/O地址是PLC与现场检测设备、执行机构进行数据通信的唯一的一一对应的寄存器地址,I/O地址的分配是对PLC进行进一步组态的基础;对OMRON-C200而言,I/O地址与所连接的I/O模块有关;连接到数字模块上的现场设备,其I/O地址取决于I/O模块的安装位置和在该模块上的点号,连接到模拟模块、PID模块上的现场设备,其I/O地址取决于I/O模块的单元号(不同的模块应通过模块的硬开关设置不同的单元号)和在该模块上的点号;比如在本系统配置中,现场的雷达液位变送器LT-101输出的4~20mA 的模拟信号连接在单元号为3的模拟输入模块AD003的第二点上,则它在PLC中的配置的地址便是IR:132;而阀门HV120的关闭状态信号(closed)连接到安装在的扩展机架第二槽的数字输入模块ID212的第十点上,则它在PLC中的配置的地址便是IR:01210;本系统中,共定义 I/O地址142点。
操作站与控制站数据交换地址的分配:操作站与控制站的数据通信是通过读写PLC的内部寄存器来完成的,为了实现操作站与控制站的实时通讯,还必须为PLC配置足够的内部寄存器地址来存贮这些数据;比如,定义DM0232作为操作站与控制站交换LT-101的数据的内部寄存器,则PLC把采集到LT-101的液位信号经过预处理后存贮在DMO232,而操作站则到PLC的DM0232读取LT-101的数据来建立自己的数据库;本系统中,共定义此类地址184点。
中间地址的分配:PLC在运行过程中,还需要大量的中间寄存器来存放那些运算过程中的临时数据,为提高应用程序的可读性,也必须对这些寄存器进行必要的定义和注释。
2.4.2.为控制策略编写梯形图
自动调节:本系统中选用3个PID03模块组成6个调节回路来完成生产过程的自动控制,为了方便操作人员在操作站对控制过程的管理,PID03的SW2应设置为ON,并编写相应梯形图以实现PLC与PID03的数据交换,比如:调节回炉PIC111由单元号为5的PID03的第二回路完成,当执行图2所示一段程序后,PLC中地址DM0060中的数据就被定义为调节回路PIC111的给定值。(完整梯形图略)
三取二表决:为保证安全生产,常压罐的压力必须控制在规定的范围内,每升高(降低)到一定范围时,就必须启动(停止)相应的设备;为此,在现场用三块压力表来测量其压力,PLC中对三个压力进行比较,只有三块中的二块同时具备条件时,连锁才动作;在编写梯形图时,采用比较指令、再加上与、或、非等逻辑指令就可实现此控制策略。(梯形图略)
连锁保护:梯形图与电气连锁逻辑图非常相似,I/O地址确定以后,为连锁保护编写梯形图既操作简单又可读性强。为保护设备和生产安全,本系统共编写连锁回路21个。(梯形图略)
2.4.3.I/O模块的设置与校正:
梯形图编写完成以后,还必须对I/O模块进行必要的设置和校正,PLC才能正常工作;模拟模块应设置与现场设备相对应的输入信号种类和对输入信号的预处理方法,还应对零点和量程进行校正;PID模块除了对输入信号种类、输入信号的预处理方法进行设置外,还要对PID模块存储区的内容及其修改方式、调节回路设定值的修改方式、PID的控制作用及其控制方式等内容进行设置。
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