Control System For PROTOS Design Based On PROFIBUS

Programmable Logic Controller (PLC) is based of relay logic control system, today it has developed into a powerful control system with the central of processor and has many functions such as all kinds of calculations, control and network. With its excellent stability and powerful functions, PLC is now widely used in manufacture industry, electric power field, traffic field and etc.Many old types of equipment adopts the control system with circuit boards and relays, it's in dire need of a new control system to updating the old one. An example of design a PLC control system for the PROTOS product line is given in this paper, it offers an idea on designing new control system to substitute the old one. The main achievements are as following:1. to analyze the original control system of circuit boards and relays, confirmed the functions that would be achieved by PLC.2.to select the appropriate PLC function modules and field bus, and design the whole frame for the new control system with the foundation of the status on the port.3. to design the PLC control software using SIEMENS STEP 7, and to achieve the functions realized by the original control system.4. to design the supervision control system though which the workers can supervise and control the product line, and it also offers a powerful datum statistic function.