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全新原裝
PLC產品種類繁多，其規格和性能也各不相同。對PLC的分類，通常根據其結構形式的不同、功能的差異和I/O點數的多少等進行大致分類。
按結構形式分類3500/15 127610-01
根據PLC的結構形式，可將PLC分為整體式和模塊式兩類。
整體式PLC整體式PLC是將電源、CPU、I/O接口等部件都集中裝在一個機箱內，具有結構緊湊、體積小、價格低的特點。小型PLC一般采用這種整體式結構。整體式PLC由不同I/O點數的基本單元（又稱主機）和擴展單元組成。基本單元內有CPU、I/O接口、與I/O擴展單元相連的擴展口，以及與編程器或EPROM寫入器相連的接口等。擴展單元內只有I/O和電源等，沒有CPU。基本單元和擴展單元之間一般用扁平電纜連接。整體式PLC一般還可配備特殊功能單元，如模擬量單元、位置控制單元等，使其功能得以擴展。3500/15 127610-01
模塊式PLC模塊式PLC是將PLC各組成部分，分別作成若干個單獨的模塊，如CPU模塊、I/O模塊、電源模塊（有的含在CPU模塊中）以及各種功能模塊。模塊式PLC由框架或基板和各種模塊組成。模塊裝在框架或基板的插座上。這種模塊式PLC的特點是配置靈活，可根據需要選配不同規模的系統，而且裝配方便，便于擴展和維修。大、中型PLC一般采用模塊式結構。
還有一些PLC將整體式和模塊式的特點結合起來，構成所謂疊裝式PLC。疊裝式PLC其CPU、電源、I/O接口等也是各自獨立的模塊，但它們之間是靠電纜進行聯接，并且各模塊可以一層層地疊裝。這樣，不但系統可以靈活配置，還可做得體積小巧。
按功能分類3500/15 127610-01
根據PLC所具有的功能不同，可將PLC分為低檔、中檔、三類。
低檔PLC具有邏輯運算、定時、計數、移位以及自診斷、監控等基本功能，還可有少量模擬量輸入／輸出、算術運算、數據傳送和比較、通信等功能。主要用于邏輯控制、順序控制或少量模擬量控制的單機控制系統。
中檔PLC除具有低檔PLC的功能外，還具有較強的模擬量輸入／輸出、算術運算、數據傳送和比較、數制轉換、遠程I/O、子程序、通信聯網等功能。有些還可增設中斷控制、PID控制等功能，適用于復雜控制系統。
PLC除具有中檔機的功能外，還增加了帶符號算術運算、矩陣運算、位邏輯運算、平方根運算及其它特殊功能函數的運算、制表及表格傳送功能等。PLC機具有更強的通信聯網功能，可用于大規模過程控制或構成分布式網絡控制系統，實現工廠自動化。3500/15 127610-01
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②Woodward:controller,etc.(e.g.9907-165,5466-409,9907-164)
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12.EPRO:MMS6000 system card MMS3000 system card.(For example:MMS6312,MMS6120,MMS6120)
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