26.05.2010 | Author / Editor: L. Enijang / Marcel Dröttboom
...reliable operation in spite of dust and vibration, plant designers decided not to abandon IP67 protection, although each and every fieldbus station was supposed to be installed in a control cabinet.
The selected fieldbus system, a series BL67, convinced the plant designers with another option: single I/O modules can be swapped in full operation. In this way, the system allows plant operators to replace broken I/O modules and avoid expensive down-times. Short-circuit protection and distinct diagnostic functionalities that provide a quick status overview complete the system’s comprehensive safety equipment. Thanks to its modular design, this fieldbus system can simply be expanded if neccessary, whether digital, analog, temperature or other signals need to be integrated.
The entire coal plant incorporates two transport stations, two coal mills crushing the combustible in two steps and a coal bunker from which the coal dust is blown into the burning kilns. Between these stations, the coal is transported via total of 14 conveyor belts. Each conveyor belt features its own control cabinet that incorporates connectors, motor-circuit switches and the fieldbus stations.
The modular I/O stations transfer all the analog and digital signals that reflect the transport system’s status, whether rate of feed, offset, distension, cracks or fill level data. The fieldbus station are connected to the higher level PLC, Control Logix 5560 by Allan Bradley, via DeviceNet. After evaluating the obtained data, the PLC submits the plant’s status quo to the management information system. The plant designers implemented a total of only two fieldbus networks – one covering 900 metres and the other covering 400 metres.
Turck’s filedbus system absolutely convinced the planning engineer, Xiangyang Bai, ultimately ensuring future cooperations with Shandong LuNeng Engineering: “BL67 is a very good fieldbus solution we are already planning to use it in future projects,” says Bai.
To guarantee continuous transportation of coal, designers trusted the Chongqing Yongchuan coal production site to the reliable, efficient and flexible fieldbus technology that guarantees a future-proof combustible production. In Turck’s IP67-rated fieldbus system, BL67, designers found a powerful solution that meets even the highest demands. This fieldbus system provides a high degree of reliability, simple maintenance and fast diagnostics combined with easy and error free installation and low wiring costs – ultimately, the best backup a plant operator can have for the efficient and safe plant operation in even the harshest environments.
L. Enijang, Hans Turck GmbH & Co KG
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