PH1013-2840

描述

PH1013-2840

顺序控制是PLC最基本、应用最广泛的领域。所谓的顺序控制，就是按照工艺流程的顺序，在控制信号的作用下，使得生产过程的各个执行机构自动地按照顺序动作。由于它还具有编程设计灵活、速度快、可靠性高、成本低、便于维护等优点，所以在实现单机控制、多机群控制、生产流程控制中可以完全取代传统的继电器接触器控制系统。它主要是根据操作按扭、限位开关及其它现场给来的指令信号和传感器信号，控制机械运动部件进行相应的操作，从而达到了自动化生产线控制。比较典型应用在自动电梯的控制、管道上电磁伐的自动开启和关闭、皮带运输机的顺序启动等。例如我分厂的原料混料系统就是利用了PLC的顺序控制功能。以往对于过程控制的模拟量均采用硬件电路构成的PID模拟调节器来实现开、闭环控制。而现在完全可以采用PLC控制系统，选用模拟量控制模块，其功能由软件完成，系统的精度由位数决定，不受元件影响，因而可靠性更高，容易实现复杂的控制和先进的控制方法，可以同时控制多个控制回路和多个控制参数。例如生产过程中的温度、流量、压力、速度等。

PLC可以支持数控机床的控制和管理，在机械加工行业，可编程控制器与计算机数控（CNC）集成在一起，用以完成机床的运动位置控制，它的功能是接受输入装置输入的加工信息，经处理与计算，发出相应的脉冲给驱动装置，通过步进电机或伺服电机，使机床按预定的轨道运动，以完成多轴伺服电机的自控。目前以用于控制无心磨削、冲压、复杂零件分段冲裁、滚削摸削等应用中。

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