FM020 HollySys communication module. Shanghai Sijian Intelligent Technology Co., Ltd. is engaged in technical development, technical consultation, and technology transfer in the fields of intelligent technology, information technology, and automation technology. The company also sells electrical equipment, automation equipment, electronic products, communication products, and electromechanical products. Industrial automation products include: PLC, DCS, sensors, frequency converters, encoders, relays, servo drives, soft starters, and touch screens. Brands involved in the products include: Eurotherm, Schneider, Siemens, ABB, SICK, P+F, E+H, Yokogawa, Yamakawa, Mitsubishi, Emerson, Honeywell, FANUC, GE, Eaton Electrical. Allocate I/O points to assign the input and output points of the PLC, and prepare an input/output allocation table or draw a wiring diagram for the input/output terminals. Next, PLC program design can be carried out, along with the design of control cabinets or operator consoles and on-site construction.
Design the ladder diagram program for the application system based on work function charts or state flow diagrams, which constitutes programming. This step is the *core task of the entire application system design and is also relatively challenging. To design a good ladder diagram, it is essential to be thoroughly familiar with the control requirements and have some practical experience in electrical design.
FM020 HollySys communication module. Input the program into the PLC. When using a simple programmer to input the program into the PLC, the ladder diagram must first be converted into instruction mnemonics for input. When programming on a computer using the auxiliary programming software of the programmable controller, the program can be downloaded to the PLC via the connecting cable between the upper and lower computers.
Perform software testing. After the program is input into the PLC, testing should be conducted. Since oversights are inevitable during the programming process, it is necessary to perform software testing before connecting the PLC to field devices to eliminate errors in the program. This also lays the foundation for overall debugging and shortens the overall debugging cycle.
Overall debugging of the application system. After the PLC hardware and software design, control cabinet, and on-site construction are completed, the entire system can undergo online debugging. If the control system consists of several parts, partial debugging should be performed first, followed by overall debugging. If the control program has many steps, segmented debugging can be conducted before connecting everything for a comprehensive test. Problems identified during debugging should be resolved one by one until debugging is *successful.