ABB编程控制器di820

ABB编程控制器di820

晶闸管输出型:一般情况下，只能带交流负载,响应速度快,动作频率高;

晶体管输出型:一般情况下，只能带直流负载,响应速度快,动作频率高;

继电器输出型:一般情况下，可带交、直流负载,但其响应时间长,动作频率低。

按结构型式分,PLC有哪几种类型?各有什么特点?

1）整体式:将CPU、电源、I/O部件都集中在一个机箱内,结构紧凑、价格低，一般小型PLC采用这种结构;

2）模块式:将PLC的各个部分分成若干个单独的模块,可根据需要选配不同模块组成一个系统,具有配置灵活、方便扩展和维修的特点,一般中、大型PLC采用这种结构。模块式PLC由框架或基板和各种模块组成,模块装在框架或基板的插座上。

3）叠装式：结合了整体式和模块式的特点,叠装式PLC的CPU、电源、I/O接口等也是各自独立的模块,但它们之间是靠电缆连接,使得系统不仅配置灵活而且体积小巧。

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