/ep_edm/en/contect_522.html SHINI PLASTICS TECHNOLOGIES, INC.

Experience Sharing

2011 Quarter 3 Issue 8

System Solution—Distributed Control System

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A high polymer material company from Harbin is the listed company specialized in modified plastic materials. At the end of 2009, the company has planned to transform the old seven extruder assembly lines into an automatic one from material handling to products output and packaging.


Project bid-inviting kicked off in August, 2010, and Shini undertook all constructions from material handling to extruder, plus conveying for granule and powder in assembly line. The high requirement for reliability, security, precision and multi-tasking render Shini adopt both independent control for each task and distributed control for central monitoring. For pre-mixing and dosing of the granulated, two large-scale gravimetric blenders SGB-2000-5 are installed in series for two times pre-mixing, which balances the feature of the granulated with maximum limit, throughput can amount to 2000kg/hr.



One SGB-600-5 is adopted in each extruder line for the recipe mixture of material, granulated and character agent. For material conveying, the distributed I/O control is adopted, each single station controls 8 hoppers. The whole system is composed of 9 gravimetric recipe mixing stations, 13 conveying stations and 1 central control station, all of which are connected with Industrial Personal Computer via one KP bus-bar to fulfill real-time monitor and data processing.


Traditional central single CPU control is unsuitable due to the complicated multi-tasking. By adopting distributed control, many tasks can be divided into several stations so that each performs its own functions without interfering with each other while data sharing is available. Compared with traditional control, it appears to be more reliable, secure and precise.


The whole system has been completed and accepted at the end of 2010 and kept in functional order.