描述
Bently 3500/15 125840-01
PLC控制系统是由继电器控制系统和计算机控制系统发展而来的,与传统的继电器控制系统相比,主要不同表现在以下几个方面。
(1)继电器控制系统采用许多硬器件、硬触点和“硬”接线连接,组成逻辑电路实现逻辑控制要求,而且易磨损、寿命短。而PLC控制系统内部大多采用“软”继电器、 “软”接点和“软”接线连接,其控制逻辑由存储在内存中的程序实现,且无磨损现象,寿命长。
(2)继电器控制系统体积大、连线多,PLC控制系统结构紧凑、体积小、连线少。
(3)改变继电器控制系统功能需拆线、接线乃至更换元器件,比较麻烦。而改变PLC控制功能,一般仅修改程序即可,极其方便。
(4)继电器控制系统中硬继电器的触点数量有限,用于控制用的继电器触点数一般只有4~8对,而PLC每只软继电器供编程用的触点数有无限对,使PLC控制系统有很好的灵活性和扩展性。
(5)在继电器控制系统中,为了达到某种控制目的,要求安全可靠,节约触点用量,因此,设置了许多制约关系的连锁环节。在PLC中,由于采用扫描工作方式,不存在几个并列支路同时动作的因素,因此,设计过程大为简化,可靠性增强。
(6) PLC控制系统具有自检功能,能查出自身的故障,随时显示给操作人员,并能动态地监视控制程序的执行情况,为现场调试和维护提供了方便。
(7)定时控制,继电器控制逻辑利用时间继电器进行时间控制。一般来说,时间继电器存在定时精确度不高、定时范围窄、易受环境湿度和温度变化的影响、时间调整困难等问题。PLC使用半导体集成电路做定时器,时基脉冲由晶体振荡器产生,精度相当高,且定时时间不受环境的影响,定时范围一般从0.001s到若干天或更长,用户可根据需要在程序中设置定时值,然后由软件来控制定时时间。
从以上几个方面的比较可知,PLC在性能上优于继电器,控制逻辑优异,特别是具有可靠性高,设计施工周期短,调试修改方便的特点,而且体积小、功耗低、使用维护方便。但在很小的系统中使用时,价格要高于继电器控制系统。
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主营DCS系统配件
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专业销售进口DCS PLC系统备件模块
PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗
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