Design On Intelligent Lord Switch Of Electrical Shipping Based On PLC

This paper introduces the main switch all kinds of intelligent electrical shipping protection functions of intelligent switch system, design the core control part includes hardware design and software design. The aim is to realize intelligent switch intelligent protection, remote control, main content is intelligent switch hardware and software design and and PC communications.Electrical shipping intelligent main breaker is Siemens s7-300 PLC as the core, 300 series of real-time monitoring of ship power system, it can automatic judgment ship in the grid overload, short-circuit, undervoltage, inverse power of common failures, and man-machine interface through real-time display the current network parameters or corresponding fault information, realization and PC communications function that allows remote monitoring possible. Hardware design USES a standardised module design method, mainly including signal input circuit, PLC system, liquid crystal display circuit, switch control circuit, communication circuit. In the process of building software using modular design method, each module relatively independent, complete specific functions. Mainly includes communication like program in, LCD display subroutines, Ethernet communication procedure and the main program. In order to guarantee the system reliability, respectively from the hardware design and software design two adopted a series of anti-interference measures.