According to the PLC can realize the function of the three grade classification of different PLC

According to the PLC controller can realize the function of different, can be roughly divided into the PLC low, mid-range and high-end machine three categories. ( 1) Low-grade machine: has the logic operation, timing, counting, basic functions, such as shift, since the diagnosis, monitoring also has certain arithmetic, data transmission and comparison, communications, remote and analog processing functions. ( 2) Mid-range machine: besides have low machine function, also has strong arithmetic, data transmission and comparison, data conversion, remote, communication, subroutines, interrupt handling and journey back control function. ( 3) High-end machine: besides has the function of a mid-range machine, also has signed the arithmetic operations, matrix operations, functions, forms, CRT display and printing, etc.
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