Abstract:

Abstract:The paper analyzes,with bridgetype grab ship unloader in a power plant dock as case sample, characteristics and practical advantages of ROCKWELL programmable logic controller (PLC).During the designing, adopted NetLinx open network structure, created 3layer network structure—information, control, equipment for control system, to fulfill the functions of control and management; meanwhile, according to the functional requirements of the controlled object, formulated overall outline and detailed design for module of PLC software structure, data files and professional control.

Key words: Keywords:PLC ROCKWELL, ship unloader, NetLinx network, software structure, data file, professional control module