PLC has different functions,PLC can be divided into three categories:low-grade,mid-grade and high-grade.
Low-grade PLC has basic functions such as logic operation,timing,counting,shifting,self-diagnosis,monitoring,etc.It can also have a small amount of analog input/output,arithmetic operation,data transmission and comparison,communication and other functions.Mainly used for logic control,sequence control or a small amount of analog control single-machine control system.
In addition to the functions of low-end PLC,mid-range PLC also has strong functions such as analog input/output,arithmetic operation,data transmission and comparison,digital-to-system conversion,remote I/O,subprograms,and communication networking.Some can also add functions such as interrupt control and PID control,which are suitable for complex control systems.
In addition to the functions of mid-range machines,high-end PLCs also add signed arithmetic operations,matrix operations,bit logic operations,square root operations and other special function functions,tabulation and table transfer functions.High-end PLC machines have stronger communication and networking functions,and can be used for large-scale process control or to form a distributed network control system to realize factory automation.
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