PLC a "sequential scan, continuous cycle" of work 1. Each scan. Focus on the input signal is sampled. Focus on the output signal refresh. 2. Enter the refresh process. When the input port is closed, Hebei plc HMI program during the implementation phase, the input of new state, the new state can not be read. Only when the program for the next scan, plc man-machine interface design, the new state was only read. 3. A scan into the input sample, plc HMI connection, program execution and output refresh. 4. Content element mapped register with the implementation of the program of change varies. 5. The length of the scan cycle is determined by three. (1) CPU instruction execution speed (2) holds the instruction itself time (3) number of instructions 6. As a result of concentrated samples. Centrally output. There is an input / output hysteresis phenomenon, the input / output response delay. II. PLC and relay control systems, computer difference 1. PLC and relay control system distinguish the former work is "Serial," which work as "parallel." The former with the "software", the latter with the "hardware." 2. The difference between the former PLC and computer work is "scanning cycle." The latter work is "ready or break" the advantages of PLC programming PLC mode most prominent use of "soft Relay" instead of "hard relay." With "software programming logic" instead of "hardware-wired logic." PLC programming languages ??Ladder, Boolean mnemonic language, and so on. In particular, the first two as commonly used. Examples include several interactive technology applications common life? A: As long as the air and waved at the screen, vegetable, easy to get to play these games, you can also exercise, plc HMI programming, if coupled with a few jumps, you can drive a speedboat through the whitewater rapids, enjoy fun adventure ?? seemingly ordinary glass windows, when you approached, depicting landscapes or fantasy landscapes slowly change, extend your vision, along with a wall of the living room into a corner of nature; if you do not want Look at these images, you can do both hands to draw the curtains of action, two curtains will slowly cover the scene closed, when you leave, restore the original glass windows transparent color, like everything had happened. Gesture recognition and synthesis, gesture remote control. plc HMI connection, subfamily (online consultation), Henan plc man-machine interface provided by Texas subfamily hydraulic machinery automation equipment Limited. Texas subfamily Hydraulic Machinery Automation Equipment Co., Ltd. (dzykzdh.com) is a leader in Dezhou, industrial automation control systems and equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Subfamily leader in automation equipment with the staff warmly welcome all inquiries negotiations to create a subfamily automation equipment better future.