Commonly used PLC according to the capacity of the classification method

Can be roughly divided into 'small', 'in', 'big' three types. 一个。 Small PLCI/O generally less than or equal to the total 256. Is characterized by small volume, compact structure, the whole hardware, in addition to the switch I/O, also can connect analog I/O, and other various special function module. It can perform include logic, timing, counting and arithmetic operations, data processing and transmission, communication network and various application instructions. Such as OMRON C * * P/H, CPM1A series, the series of CPM2A series, CQM, SIMENS S7 - The 200 series. b。 Medium PLCI/O total number of points from 256 points to 2048 points, usually there are 8 k in the following, I/O processing mode in addition to the general PLC controller general scanning way, still can use direct approach, namely in the process of scanning the user program, read input, refresh the output directly. It can join various special function module, communication networking stronger, richer instruction system, memory capacity is bigger, faster scanning speed. Such as OMRON C200P/H, SIMENS S7 - The 300 series. c。 Large PLC controller I/O points commonly called large PLC in more than 2048 points. Big strong hardware and software function of PLC controller. With strong self-diagnosis function. Communication networking capability is strong, there were various communication network module, can constitute a three-level network, realize factory production management automation. Such as OMRON C500P/H, C1000P/H, SIMENS S7 - The 400 series.
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