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ControlLogix-Based Large Bulk Grain Silos Control System Design

A large number of devices are involved in bulk grain silos system and the control flows are particularly complicated. To cope with the complexity, a structured system program design approach is proposed in this study while the Control Logix system is adopted as the operating platform. Meantime, an intelligent flow path selection method by means of a flow table is used to select the control flow. The readability of the programming codes is greatly improved and the complication of sequence control for large-scale equipment is simplified. A range of functions are realized by help of the configuration software iFIX, including flow select, start, stop and suspend, as well as display of the running status of the devices and real-time alarming, etc.