PLC products are a wide variety,its specifications and performance are also different.The classification of PLC,usually according to the structure of the form of the different,functional differences and I/O points of the number of roughly classified.
Classification by structural form 3500/15 127610-01
According to the structure of PLC,PLC can be divided into two types:integral type and modular type.
Integrated PLC Integrated PLC is the power supply,CPU,I/O interface and other components are centralized in a case,with compact structure,small volume,low price characteristics.Small PLC generally uses this integral structure.Integral PLC by different I/O points of the basic unit(also known as the host)and expansion unit composition.The basic unit contains the CPU,I/O interface,expansion port connected to the I/O expansion unit,and interface connected to the programmer or EPROM writer,etc.There is only I/O and power in the expansion unit,but no CPU.The basic unit and the extension unit are generally connected by flat cables.The integral PLC can also be equipped with special function units,such as analog unit,position control unit,etc.,so that its function can be extended.3500/15 of the 127610-01
Modular PLC Modular PLC is the PLC each component,respectively into a number of separate modules,such as CPU module,I/O module,power module(some included in the CPU module)and a variety of functional modules.Modular PLC is composed of frame or substrate and various modules.Modules are fitted to sockets in the frame or substrate.This modular PLC is characterized by flexible configuration,can be selected according to the needs of different scale system,and convenient assembly,easy to expand and maintenance.Large and medium-sized PLC generally adopts modular structure.
There are some PLC integrated and modular characteristics of the combination,constitute the so-called stacked PLC.Stacked PLC CPU,power supply,I/O interface is also their own independent modules,but they are connected by cable,and each module can be stacked layer by layer.In this way,not only the system can be flexibly configured,but also can be made compact.
Classification by function 3500/15 127610-01
According to the functions of PLC,PLC can be divided into low-grade,middle-grade,high-grade three categories.
Low-grade PLC with logic operation,timing,counting,shift and self-diagnosis,monitoring and other basic functions,but also a small amount of analog input/output,arithmetic operations,data transmission and comparison,communication and other functions.Mainly used for logic control,sequential control or a small amount of analog control of the single machine control system.
In addition to the functions of low-grade PLC,mid-range PLC also has strong analog input/output,arithmetic operation,data transmission and comparison,number system conversion,remote I/O,subroutine,communication networking and other functions.Some can also add interrupt control,PID control and other functions,suitable for complex control systems.
High grade PLC in addition to the function of mid-range machine,but also added with signed arithmetic operation,matrix operation,bit-logic operation,square root operation and other special functions of the operation,tabular and table transfer functions.High grade PLC machine has stronger communication network function,can be used for large-scale process control or constitute a distributed network control system,to achieve factory automation.3500/15 of the 127610-01
3500/15 127610-01全新原装
PLC产品种类繁多，其规格和性能也各不相同。对PLC的分类，通常根据其结构形式的不同、功能的差异和I/O点数的多少等进行大致分类。
按结构形式分类3500/15 127610-01
根据PLC的结构形式，可将PLC分为整体式和模块式两类。
整体式PLC整体式PLC是将电源、CPU、I/O接口等部件都集中装在一个机箱内，具有结构紧凑、体积小、价格低的特点。小型PLC一般采用这种整体式结构。整体式PLC由不同I/O点数的基本单元（又称主机）和扩展单元组成。基本单元内有CPU、I/O接口、与I/O扩展单元相连的扩展口，以及与编程器或EPROM写入器相连的接口等。扩展单元内只有I/O和电源等，没有CPU。基本单元和扩展单元之间一般用扁平电缆连接。整体式PLC一般还可配备特殊功能单元，如模拟量单元、位置控制单元等，使其功能得以扩展。3500/15 127610-01
模块式PLC模块式PLC是将PLC各组成部分，分别作成若干个单独的模块，如CPU模块、I/O模块、电源模块（有的含在CPU模块中）以及各种功能模块。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。这种模块式PLC的特点是配置灵活，可根据需要选配不同规模的系统，而且装配方便，便于扩展和维修。大、中型PLC一般采用模块式结构。
还有一些PLC将整体式和模块式的特点结合起来，构成所谓叠装式PLC。叠装式PLC其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进行联接，并且各模块可以一层层地叠装。这样，不但系统可以灵活配置，还可做得体积小巧。
按功能分类3500/15 127610-01
根据PLC所具有的功能不同，可将PLC分为低档、中档、三类。
低档PLC具有逻辑运算、定时、计数、移位以及自诊断、监控等基本功能，还可有少量模拟量输入／输出、算术运算、数据传送和比较、通信等功能。主要用于逻辑控制、顺序控制或少量模拟量控制的单机控制系统。
中档PLC除具有低档PLC的功能外，还具有较强的模拟量输入／输出、算术运算、数据传送和比较、数制转换、远程I/O、子程序、通信联网等功能。有些还可增设中断控制、PID控制等功能，适用于复杂控制系统。
PLC除具有中档机的功能外，还增加了带符号算术运算、矩阵运算、位逻辑运算、平方根运算及其它特殊功能函数的运算、制表及表格传送功能等。PLC机具有更强的通信联网功能，可用于大规模过程控制或构成分布式网络控制系统，实现工厂自动化。3500/15 127610-01
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12.EPRO:MMS6000 system card MMS3000 system card.(For example:MMS6312,MMS6120,MMS6120)
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