ABB 3BSE017429R1 NMTU-21C 热阻功率模块

ABB 3BSE017429R1 NMTU-21C 热阻功率模块

（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。

(1) Integral: the CPU, power, I/O components are concentrated in a chassis, compact structure, low price, generally small PLC using this structure;

(2) Modular: the various parts of the PLC are divided into several separate modules, which can be selected according to the needs of different modules to form a system, with flexible configuration, easy expansion and maintenance characteristics, generally medium and large PLC adopt this structure. Modular PLC is composed of a frame or substrate and various modules, and the module is mounted on the socket of the frame or substrate.

(3) Stacked: combined with the characteristics of integral and modular, stacked PLC CPU, power supply, I/O interface, etc., are also independent modules, but they are connected by cable, making the system not only flexible configuration and small size.