(1) digital control this is the mos

(1) digital control this is the most widely used field of PLC to replace the traditional relay control. Serial, parallel and combinatorial logic or control with contacts, timing, counting control, etc. PLC can be applied to single chip microcomputer control, multi - unit control and production automatic line control. Its applications have spread throughout the industry and even into the home.(2) motion control PLC USES a dedicated motion control module to control the position, speed and acceleration of linear or circular motion, thus achieving uniaxial, biaxial, triaxial and multi-axial control. By combining motion control with logic control, programmable motion control can be applied to various machines, such as machine tools, assembly machines, robots, elevators, etc.(3) process control through analog I/O module, PLC can control many physical parameters, such as temperature, pressure, speed and flow. PID (proportional integral and differential) function provides PLC with closed-loop control function for process control. The PLC is widely used in plastic molding, heating furnace, heat treatment equipment, boilers and light industry, metallurgy, electricity and other industries.(4) data processing modern programmable controller has mathematical operations (including four arithmetic operations, functional operations, word logic operations, floating point operations and reverse, loop, etc.), data transmission, conversion, such as table lookup, sorting and bit operations such data can complete data collection and processing. Operational data can be compared with reference values for control, operational data can be communicated with other intelligent devices, or data can be printed and tabulated. Data processing is typically used in large control systems, such as process control systems and unattended flexible control systems.(5) communication network programmable controller communication includes communication between host and remote I/O, multiple programmable controllers, and communication between programmable controllers and other intelligent control devices. Such as the computer; Through the distributed control system of centralized control and distributed control, the communication between frequency converter and nc equipment can greatly improve the reliability of control.