PLC在进口设备改造中的应用

Application of PLC to Reformation of Import Equipment

可编程控制器可靠性高 ,应用方便 ,在国内外得到广泛应用。复杂设备的电气控制箱正在被可编程控制器所代替。介绍引进设备使用继电器所存在的问题 ,论述控制系统各部分功能 ,举例说明PLC的选用。在进行可编程控制器系统设计时 ,先要了解控制对象的控制要求、控制范围、控制功能 ,以便正确使用PLC ,达到实现其控制的目的。

The programmable controller (PLC) is used at home and abroad extensively due to its higher reliability and convenient application.The electric control box of complex equipment is being replaced by PLC.The questions of relay existing in imported equipment are introduced.The functions of different part of control system are expounded,and take the selection of PLC for example to state.When the PLC system is designed,the control requirements,scope and function of the controlled object are known firstly,so as to select PLC correctly and to realize autocontrol.