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以触摸屏、PLC和智能仪表三者相结合的控制方式为例,讨论混凝土搅拌站控制系统中的关键技术及相关的PLC程序设计,PLC是整个系统的控制核心,关键技术包括初始化过程、人机对话、模拟量处理、落差计算、生产打印等。对初始化过程中设置中断协议和自由通讯口协议、与触摸屏进行实时通讯,实现人机对话、完成模拟量的输入处理,实现量程转换、对流体或液体物料加料时,自动计算落差,以及打印表格、字符和数据等部分内容进行了程序设计。
Taking touch screen, PLC and intelligent instrument as an example, the key technologies in the control system of concrete mixing plant and related PLC programming are discussed. PLC is the core of the whole system. The key technologies include initialization process, Dialogue, analog processing, drop calculation, production printing. Set interrupt protocol and free communication port protocol in initialization process, communicate with touch screen in real time, realize man-machine dialogue, complete analog input processing, realize range conversion, automatically calculate drop when feeding fluid or liquid material, and print form , Character and data part of the content of the program design.