The concept of PLC system program and user program

PLC controller software system refers to the collection of PLC used by various programs. It includes the system program and user program. ( 1) System program system including monitoring procedures, compiler and diagnostic procedures, etc. Monitoring program, also known as management procedures, mainly used for the management of the whole machine. Compiler used to translate programming languages into machine language. Diagnostic procedures used to machine fault diagnosis. System program provided by the PLC manufacturers and solidified in the EPROM, users can't directly access, so also do not need the user intervention. ( 2) User program user is the user according to the demand of field control with PLC programming language to compile the application, to achieve a variety of control requirements. The user program with programmer typed by the user to the PLC controller memory. Small PLC controller user program is simple, do not need to block, but order preparation. The user program is very long, large and medium-sized PLC is more complicated, for the user to program simple and clear, can be used according to the function structure or purpose every module will be divided into the user program. According to the modular structure of the user program, each function module is used to solve a certain technology, can make a long programming is easy to understand, also makes it easy to debug and modify the program. For nc machine tools, CNC machine tools in the PLC user program provided by the machine tool manufacturers, and has set up a cure to the user in the EPROM, machine tool users don't need to write and modify, only when the machine failure occurs, according to the ladder diagram and electrical machine tool plant provide principle diagram, to find the point of failure, for repair.
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