Function of PLC: programmable controller, referred to as PC. But because PC is easily confused with personal computer, people are still used to using PLC as the abbreviation of programmable controller. It is an electronic system device with microprocessor as the core for digital operation, specially designed for industrial field application. It uses programmable memory to store operating instructions such as logic operation, sequence control, timing/counting and arithmetic operation, and controls various types of machinery or production processes through digital or analog input and output interfaces. PLC is a combination of microcomputer technology and traditional relay contact control technology. It overcomes the shortcomings of complicated mechanical contact wiring, low reliability, high power consumption and poor versatility and flexibility in relay contact control system, makes full use of the advantages of microprocessor, and takes care of the skills and habits of field electrical operators and maintenance personnel, especially PLC programming. It does not need the special knowledge of computer programming language, but adopts a set of simple instruction forms based on relay ladder diagram, which makes the user's programming vivid and intuitive. Debugging and error detection are also very convenient. After purchasing the required PLC, users can flexibly and conveniently apply PLC to production practice by doing a small amount of wiring and simple user programming according to the instructions.
Brands: Mitsubishi, Siemens, ABB, GE, Omron, Schneider, Honeywell, Rockwell, etc. Large PLC belongs to Siemens and ABB, and its overall performance is superior. Small and medium-sized Mitsubishi, Omron and Siemens have higher market share, among which ABB, Siemens, Honeywell and Rockwell have higher prices, and basically each brand has its own large and medium-sized PLC.
Brands in Taiwan Province Province: Delta, Yonghong, Li Meng, Shilin, Fengwei, Zhiguo and Taian.
Mainland brands: Shanghai Zheng Hang, Shenzhen Hexin, Xiamen Haiwei, Nanda Otto, Devishen, Hollysys, KDN, Xida Kong Zhong, Xida Neutron, Emerson, Lanzhou Quan Zhi, Kewei, Kosain, Nanjing Guande, Zhida, Hai Jie, Yida Zhongshan Zhida Jiangsu New Street, Luoyang Yida, etc.