The Application Of PLC Based On Ethernet In ASH System Of Boiler

This paper, taking the application of Modicon Quantum Programmable Controller(PLC) in the ash system of boiler as an example, introduces the method to plan PLC control system and the process to design hardware and software.The main task of ash system is to collect and store the ashes brought by coals burning then carry them to the appointed place like the ash field. After surveying the ash system in detail, we planned the total scheme. The PLC control system includes a PC and four PLCs and adopts Ethernet network between PC and PLCs to realize data traffic. According to the equipments in the field, we adopted Modicon Quantum PLC to configure PLC's hardware and program Concept to design software. It is noted that we created manipulator Function Blocks based on integral equipment. They were designed according to the running information of integral equipments like electromotor and electromagnetic valve so that we can monitor the integral equipments with them. Other than function block, we designed an interface like a manipulator so that the worker can manipulate the equipment easily. As for the man-machine interface (MMI), we adopted program InTouch developed by Woderware company.