| With the rapid development of industry in today's society, all kinds of goods on a production line, the basic use machine instead of manual, automatic control instead of the basic artificial operation, save the human resources, increase the economic benefit. PLC is in computer technology, communication technology and relay control technology based on the development of the development, and has been widely used in all walks of life, including roll line products of the production is no exception, with communication and the electric power industry in the rapid rise of China, the growing demand for electric wire and cable, and tension control in the wire and cable in the production of the role that is very important. Based on this kind of situation, designed a set of sensors, by PLC, frequency converter of the tension of the measurement and control system.This paper introduced the design of the software and hardware of the system, and the experiment test.Hardware, with powerful Siemens S7-200 PLC CPU226 as the core, Siemens MM420 frequency converter for drive device, tension sensor signal sampling circuit of the composition such as automatic control system.Software, mainly involves PLC and inverter, the software of the software design, this paper explains tension sensor output signal sampling and PLC host, analog quantities EM235 module of collected numerical simulation of a comprehensive deal with content. Will the output voltage tension sensor signal transmission to the Siemens PLC host processing, the use of S7-200 PLC and inverter communication instruction USS, will tension signals to frequency converter, the scene of real-time data update, users can through the PLC logical operations and frequency inverter parameter setting, so as to achieve the tension control volume line products requirements.At last, the design of the control system of the tension test. The experimental results show that the system can be a very good control force, and the effect is good. |
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