PLC programming and application characteristics

Easy to learn programming method of the PLC ladder diagram is used most widely programming language, its symbols and expression way and the relay circuit schematic diagram, ladder diagram language image intuitive and easy to understand and familiar with the relay circuit diagram of electrical technicians, it only takes a few days can be familiar with ladder diagram language, and used to prepare the user program. Ladder diagram language is actually a user-oriented high-level language, PLC ladder diagram program, the execution will 'translate' it into assembly language and then to carry out. Strong function, high cost performance a small PLC has hundreds of thousands of programming elements available to the user, has a strong function, can achieve very complicated control function. Compared with the same function of relay system, has the very high cost performance. PLC can be realized through the communication network, distributed control, centralized management. Hardware complete, the user easy to use, adaptable PLC products have been standardization, seriation, modularization, equipped with complete varieties of all kinds of hardware device for user selection, users can be easily to carry on the system configuration, flexible system of different functions, different scale. PLC is also easy to install wiring, generally use external connection terminals. PLC controller on load capacity, can direct drive general solenoid valve and small and medium ac contactor. Hardware configuration is determined, by modifying the user program, can be convenient and quick to adapt to the changes in process conditions. High reliability, strong anti-interference ability of traditional relay control system used in a large number of intermediate relay and time relay. Due to the contact point contact undesirable, prone to failure. PLC software replaced plenty of intermediate relay and time relay, only a small amount of hardware components related to the input and output, the connection can be reduced to one over ten of the relay control system to one percent, greatly reduced because of failure, which is usually caused by poor contact point contact. PLC with a series of hardware and software anti-interference measures, strong anti-interference ability, MTBF reaching tens of thousands of hours, can be directly applied to industrial production field, has a strong interference PLC big user recognized as one of the most reliable industrial control equipment. System design, installation, debugging workload less PLC software function to replace the relay control system of a large number of intermediate relay, time relay, counter device, the control cabinet design, installation, wiring work greatly reduced. PLC ladder diagram of sequential control design method can be used to design program. This programming method is very regular, easy to master. For complex control system, if have the right design method, design of ladder diagram than design circuit diagrams of relay system is much less time. Can simulation to debug PLC user program in the laboratory, the input signal with a small switch to simulate, through PLC light-emitting diodes (leds) to observe the state of the output signal. After completed the system installation and wiring, in the field of unit adjustment problems found in the course of the general can solve by modifying the program, system debugging are much less time than the relay system. Maintenance workload small, convenient maintenance of PLC failure rate is low, and improve the diagnosis and display function. PLC or external input device and actuator failure occurs, can according to the light emitting diode on the PLC or the information provided by the programmer to easily find out the cause of the failure, use the method of replacement modules can troubleshoot quickly. Small volume, low energy consumption for complex control system, using PLC, can reduce a lot of intermediate relay and time relay, the volume of small PIC only equivalent to the size of several relay, so the volume of the switch cabinet can be narrowed to the original l / 2 ~ 1/10. PLC control system of wiring are much less than relay control system, so it can save a lot of wiring and accessories, working hours, reduce a lot of installation wiring and switch cabinet volume reduction, can save a lot of cost.
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