from the Profibus-DP decade ago in Europe a start on the advanced performance and convenience of use, application of¨¨??economy rapidly by the general Zhizao Ye accepted by the users and has been occupying the number of fieldbus applications the largest share. Fieldbus control system in recent years with the growing prosperity, and promote the continuous development of Profibus-DP technology, not only scattered in the field of I / O connected to the control room, while the traditional implementation should be the main station down the control task to the slave device, in order to achieve truly distributed control system. 100 meters, more than 1200 I / O points. Users of the control system requirements that all I / O states are concentrated in the control room monitoring, pasteurization, to be installed, CIP cleaning to achieve three important local display and control subsystem, the entire system both advanced and economical , is open makes the spare parts are not locked into a single supplier. And benefits for users when the company requested a solution as shown in the end accepted by the user. Network, Profibus-DP, the main station of
Siemens PLCS7-400 series, S7-400 powerful enough to complete the task more than 1,000 points of control; by the Profibus-DP connection lang = "EN-US"> 22 a partial I / O boxes were installed next to each subsystem of equipment, minimizing the amount of cable. Which pasteurization, to be installed, CIP in three slave interface with PLC, respectively, the system control task execution, and control state information From the main station, three each from the station with a touch screen PLC as a man-machine interface . From the station can use the PLC to control the subsystem is not unexpected because of network failures down to avoid wasting precious resources milk. ´ factory fresh milk, yogurt production line for the daily output of 200 tons of large-scale production line, pre-treatment section includes milk collection, pasteurization, to be installed, mixing, bacteria spread cultivation, fermentation, homogenization / cold, CIP cleaning , energy consumption and production monitoring of 12 sub-systems, production line covers 50 acres. the system I / O and from the station when the PLC all use and benefit the company s PLC products. This option provides users with two benefits: first, to avoid the use of foreign brand products to the system price is too high; the second and Belgium can use STEP7 PLC programming language, and S7-400 the same, users do not have to spend extra effort to learn. Successful implementation of this project and the benefits that can be when the PLC bus and
Siemens Profibus-DP and Profibus-certified products to any connected, and greatly expandedng = "EN-US"> DP bus, and realize the true sense of the field bus control system. Profibus-DP technology is and Belgium in the hands of one of the core technology, the DCS and PLC are widely used in so when the PLC system and facilitate small-scale control system market with famous overseas companies stood on the same starting line. “ this system so that we truly understand the introduction of a national brand of technical strength ”, director of systems such inspection work of the technical staff commented, “ performance comparable with the international advanced level, prices full account of national conditions and benefit when combined with the credibility of the security company, such cooperation should become well-known companies in different sectors of cooperation between the model. ”