IC660ELB912J

IC660ELB912J GE PLC 现货 价格

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plc控制系统设计
5.1 主控plc控制电路设计
        根据提升机的运行方式和煤矿企业的固有特点，国产矿井提升机电控制系统中应用plc也发展很快。但从现场使用情况来看，目前，在国产煤矿提升机控制系统中，plc主要用于处理开关量，以替代老式提升机控制系统中众多的继电器、接触器、复杂的连线以及信号显示系统，而涉及到提升机安全运行的制动系统中的模拟量和自动调节过程，大多还是通过用半导体器件、运算放大器等可调闸和可控硅动力制动的普通电子模式来处理。使用过程中经常会出现零点漂移、电子元件损坏，并且存在维修及重新调试难、可靠性差等缺点，因而使提升机电控系统的可靠性降低。针对上述问题，深入研究用plc控制煤矿提升机控制系统是非常必要的。
        本文中主控单元可编程序控制器（plc）设计，由一个cpu226主机和两片i/o扩展模块em223和em222组成，设计含有40个输入点40个输出点， 则具体i/o接线如图7所示。

图7  主控plc电路及扩展i/o接线

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