PLC and HMI printing machine control system application is introduced

generally modern printing presses made by plate, stamping, painting ink, paper ( Including folding) Institutions such as composition. Its working principle is: first, to be printed words and images to make plate, installed on the printer, then by artificial or printing ink coating on the plate there is words and images, and then directly or indirectly, transfer to the paper or other substrates ( Such as textile, metal, plastic, leather, wood, glass and ceramics) To replicate the same print as the plate. The invention of the printing press and the development, for the spread of human civilization and culture plays an important role. The development of the printing industry by a relatively simple way of book printing, gradually transformed into the now commonly used offset printing and digital printing patterns of increasingly thrive. Behind the model and promote the development of faith, is, of course, according to the manufacturers to continuously improve the production efficiency and improve the quality of products in the market competitiveness and appeal of the.

because people for smart printing production methods and diversification of newspaper production put forward higher request, therefore the corresponding of the printing press has also formed a new management concept. In this new printing environment, flexible and consistency as a key requirement, and printing machine control system based on PLC and HMI is able to fully meet the requirements.

multicolor printing machine for easy operation, high accuracy, so its input and output points more, thus adopted double machine communication. PC mainly responsible for the control of main drive, the clutch pressure control, and air pump, valve, etc. , the control of the lower machine mainly responsible for the control of water roll motor, main drive speed control output, the version of the motor data acquisition, etc. Upper machine and lower machine adopted RS485 communication, communication is convenient, and reliable.

for multi-color machine, safety factor is very important. In the design, each unit should not only consider the safety control, including the standard unit of scram, security button; Consider convenient operation, each unit shall have excellent, including the button. Therefore, on the one hand, the input point increases a lot; On the other hand, walk line also is not very convenient. Adopts double machine communication, is a good way to solve this problem, the unit can get the line according to the principle nearby, the ark into closer to its control, saves walk the line, is also convenient for control.

print quality lies in the accuracy of machining and installation on one hand, on the other hand, also depends on the waterway, the balance of ink road, and the accuracy of the pressure. Each color group, two-color machine, there is water and ink device. In order to facilitate water roller speed regulating, each root water roll with a frequency converter control, at the same time, also need inverter to adjust the main motor speed. Therefore, in order to achieve the multi-channel speed regulation, need to use d/a converter, it would give the digital quantity of PLC, according to the corresponding algorithm, converted into 0 ~ 10 v dc voltage output, well realize the multi-channel speed regulation requirements. = of PLC Programmable Logic Controller, Programmable Logic Controller, a digital computing operation of electronic systems, specially designed for applications in industrial environment. It USES a programmable memory for its internal storage procedures, to perform the logic operation, sequence control, timing, counting and arithmetic operations such as user-oriented instructions, and through the digital or analog input/output control various types of machinery or production process. Is the core part of industrial control. Early programmable controller called programmable logic controller ( 可编程序逻辑控制器,PLC) It mainly used instead of relay realize logic control. With the development of technology, which USES a microcomputer technology of industrial control device functionality is considerably more than the scope of logic control, therefore, today the device called the programmable controller, hereinafter referred to as PC. But in order to avoid and personal computer ( 个人电脑) Referred to as 'confused, so will be referred to as PLC programmable controller, PLC controller data device companies in the United States since 1966, 12月) Development, currently the United States, Japan, Germany programmable controller, good quality powerful.

in the process of printing, the version is a more cumbersome process. Especially for multi-color machine, the accuracy of each version for can produce great influence to printing quality. If misregister, print will appear literally overlap or image is not clear. In general, plate axial adjustment range for - 2 mm ~ + 2 mm, weeks to adjust the range of - 1mm～+1mm。 If you are using a manual version, will waste a lot of time, and the accuracy is not high.

the application of touch screen omitted some of the original button, indicator light, counter, tachometer, time relay, and lubrication programmable controller and other components, reduce the failure rate, and the workload of wiring. Touch screen image can be in the form of version offers a wide range of alarm information, and also can design more screen PLC input and output state monitor screen, can also see the machine electrical operation and maintenance in system help prompt in detail, the electrical system of the machine operation, use, maintenance easy and convenient.

the system used in the printing press after mass production, found no big problem. PLC functional, reliable, durable, instruction is concise, touch screen and PLC has good generality and can be through the touch screen monitor and modify the program, to designers and users has brought a lot of convenience.

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