Development Of Communication System Based On Mitsubishi And Z-control PLZ

A certain type of equipment developed by a domestic institution is important equipment for the PLA.This equipment consists of numerous components,and multiple control cabinets are responsible for controlling these components,which are independent of each other and do not form a unified control system.This equipment requires more than one operator to cooperate with the control,and for each operator to obtain the status information of other components is slow,resulting in tedious operation,longer waiting time,and a certain degree of manpower and time waste;and all operations must be done by a strictly standardized process,a slight error will produce significant damage to the equipment,affecting national defense security.With the advancement of intelligence and product localization process,the equipment users have a higher demand for automation of this equipment and alternative demand for localization of some controls.In this thesis,a communication system has been developed for each control cabinet of the whole equipment for the centralized automation control transformation needs of this equipment,and relevant functional tests have been carried out,the specific work is as follows:(1)Design of communication scheme.According to the functional requirements,a three-level communication system is designed,using the redundant PLC system of Z-Control as a transit station of the Ethernet communication scheme to achieve communication between Mitsubishi and Z-Control PLC;using CC Link IE and Ethernet communication scheme to achieve communication between Mitsubishi PLC;using Networking protocol to achieve communication between Z-Control PLC;using Modbus serial protocol to achieve communication between PLC and instrument communication scheme.According to the data requirements of each PLC communication,a self-use communication protocol was developed to manage the data storage area,avoiding data disorder and communication failure caused by the wrong address of soft components of communication transmission.(2)Selection of communication modules.Combining the communication protocols used by the two brands of PLCs,different communication support devices were used to provide hardware guarantees for the reliability and stability of the communication system.Moreover,the PLC configuration was also drawn up and installed and commissioned according to the control and communication modules required by each PLC.(3)Program design and implementation.We correspondingly configured the communication module parameters,used different communication instructions and function block programming,and finally achieved the communication between 22 control cabinets of two brands of three PLCs and two instruments.And we designed the communication detection mechanism to make timely warning of communication failure and to facilitate the control system to make the corresponding equipment control.(4)Scheme improvement and operational testing.We optimized the communication software and hardware scheme for the communication problems that appeared during the test.We conducted multiple tests on each function to compare the sending area and receiving area of data and ensure the reliability of data transmission.We also conducted multiple tests on each group of communication delays to ensure that the communication system meets the usage standards and guarantee that the communication system passes the third party and user’s inspection successfully.The communication technology and communication system building scheme covered in this thesis will provide a technical reference for the automation transformation of the same type of large equipment,offer a technical solution for the communication between two brands of PLCs,Mitsubishi and Z-Control,and lay the foundation for the complete localization of this equipment.