Papers by Keyword: Ethernet Communication

Abstract: This paper studies the design of a new intelligent PLC (Programmable Logic Controller) for Ethernet communication based on the switched network. It proposes a new solution for the Ethernet-based automation equipments and the related applications, which is used to control a variety of industrial processes in distributed locations. The points we discuss mainly involve Ethernet I/O architecture and the hardware design of communication module. For the field part, the scope of our control objects includes the remote I/Os and the interfaces with other equipments of this level, typically distributed I/Os & devices. For the devices of the architecture, we focus on discussing the hardware design of the communication module in our architecture. The design includes the system architecture with a new dual processer, reset signals and power supply supervisor, data strobe and clock, which have acted the kernel part in information exchange of intelligent PLC based on industrial Ethernet. It is a new solution for the Ethernet-based automation applications and implementations.

Abstract: For the increasing development of smart grid and the basic requirements of smart substations for digital information, networked communication platform and standardized information sharing, it’s very necessary to do research on the merging unit, which is the important equipment in process layer of substations. In order to adapt to the development of smart substations, according to IEC61850-9-2 standards, a new merging unit based on dsPIC30F6014 and STM32F107 is designed in this paper and each function module is designed and analyzed. DsPIC is responsible for data receiving and processing and the controlling of logical state. STM32F107 is responsible for the synchronization of merging unit and Ethernet communication. Time-synchronization based on IEEE1588 precision time protocol is especially introduced in this paper.

Abstract: Intelligent release is core control unit of intelligent appliances, which is used to protect power system and power devices from damage under the faults. In this paper, with LPC2478 as Microcontroller, an intelligent release control unit with Ethernet communication functionality was presented. The intelligent release control unit’s basic functions and extended functions were described in brief. Implementation method of control unit was illustrated in detail. Process flow chart for fault diagnosis was supplied. Full-wave Fourier algorithm was adopted to compute fundamental components and harmonic components to filter decaying DC component and non-integer harmonic. This release can be adjusted according to the requirement of power quality to avoid malfunction under the circumstance that non-fault current and voltage fluctuation occur. Furthermore, through Ethernet communication, more functionality can be implemented to make the release more intelligent.

Abstract: In order to satisfy the running requirements of Automated Storage and Retrieval System’s control system with big load, high speed and high accuracy, the design is proposed by adopting PLC and servo motor control. The Ethernet , MELSECNET/H ,CC-LINK and serial communication of Mitsubishi is adopted to satisfy complicated worksite environment, meanwhile the semi-closed loop control and full-closed control is adopted to satisfy the demand of high speed high accuracy smooth running servo control system. The practical application verifies that the system is of high reliability and stability, thus greatly meets the production requirements, and saves considerable labor force.

Abstract: EtherNet/IP protocol (EIP) is a new standard of field bus standard. It is an open industrial networking standard that supports real-time I/O messaging, explicit message exchange. This paper has a discussion on the structure of EIP, EIP packet encapsulation and its application in industrial area. And it analyses the working principle of CIP, which includes objects, services, and application data. In addition, it studies how EIP realize Explicit Messaging and Explicit Message. It gives the analysis of application of EIP in industrial area.

Abstract: This paper discusses the problem of synchronizing multiple robots in cooperative tasks. The problem is divided in two parts: first the problem of synchronizing robots which are handling large objects that cannot be manipulated only by one robot (hard connected robots) is discussed; the problem is approached from the point of view of path planning, kinematics, and movement synchronization. An alternative of control using the force control and dynamics which solved by using a decentralized control structure is also presented. The second problem concerns robot synchronization in a shared workspace; here is presented a method of control for collision avoidance and time optimization for the robot tasks (assembly / disassembly). In the conclusion section the results from the experiments conducted on two SCARA type robots (Adept Cobra s600) are presented.