Research And Design Of RTU Based On COLDFIRE Hardware Platform

Based on deep understanding of the present situation and the development trend of the substation monitoring devices at home and abroad, monitoring devices designed in this paper adopts an open concept. It faces the electrical spacing design. It is suitable for power plant or transformer substation’s one or two electrical equipment installation unit to monitor and control real-timely and overall. In addition to having the basic functions of DI, DO, AI, AO, it has the functions of synchronism check or no-voltage check of electrical degree, the simple fault recording and other functions. The network communication function of this device has the self diagnosis and fault information indicating alarm functions, it also accesses IRIG-B scheme of high accuracy of GPS satellite clock time synchronization network.In the hardware design, it uses high-performance embedded FREESCALE32bit coldfire CPU, work with CPLD and FPGA (Field-Programmable Gate Array), teamwork and undertake different task, make the best of CPU powerful processing capacity, design more COM ports, parallel data bus, double ETH, LCD, keyboard, accuracy synchronization function.In the software design, it uses object-oriented programming ideas, and the embedded real-time operation mature System VxWorks. It can combine the user-defined database, COM port driver, data acquisition, communication management organically, and ensure the independence of each port. It has a rich library of communication protocol. In the protocol design, it fully considersthe master and slave protocol processing differences. It uses the’class’inheritance way, reduces duplication of code, and shortens the development cycle. Without changing the hardware of main equipment conditions, it can be composed of many different functions through the configuration of the software module. It can realize the programmable logic control supports IEC61131-3standard (PLC) function, it can realize the operating locking function of electrical units and the interlocked operation scheme among the different electrical units, and realize the function of IEC61850module at the same time.