Truly distributed control systems using fieldbus technology

State-of-the-Art industrial automation and control systems lack of universal communication technologies in order to handle their increasing engineering complexity. In opposition to the automation and control domain, where different field bus technologies are competing, the automotive domain has identified similar problems, founded a corporate consortium and introduced a new universal bus system. This new bus system is called FlexRay and is supposed to be the successor of CAN and analog bus systems for in-car applications. Similar to the introduction of CAN within the automation domain FlexRay may become the standard for distributed automation and control applications. This paper investigates the FlexRay communication system for its usage in the field of automation and control, by defining scenarios for the beneficial usage of FlexRay and by identifying the advantages and disadvantages compared to current available field bus systems.

Field bus technology has been widely used in vehicle electronics. For that distributed control system based on field bus can reduce electric system wiring, improve reliability, enhance information sharing, reduce repair difficulty, the application of field bus in electric drive vehicles will be the trend in future, and the time performance of field bus system will draw much attention. In order to share information of the field bus in a greater extent and to obtain a high level of decentralized control system, it is necessary to establish time coordinates between the subsystems, and then analyze the time performance of the field bus. This article introduces a design method of the distributed control system based on CAN bus for validating time characteristics precisely based on the distributed system of CAN bus. The experiment results verified its feasibility.

Distributed computer control system based on the fieldbus was designed according to the current production process and technology of asphalt concrete mixer. The design of overall structure and software structure of the control system was also made. The program flows of the main program of batch control and the batch submodule were analyzed and designed. The compensation rate learning algorithm of system was developed based on the iterative self-learning control method, and the control process of algorithm routine was provided. By using the field bus structure, the operational reliability and anti-jamming capability of system were improved. With the compensation iterative self-learning algorithm, the precision of measurement and control was raised and the transmission error was reduced. The key problem of computer control technology and the field bus technology used in asphalt concrete mixer control system to realize the field control and the remote communication was solved by the design. It reduces the cost of production, increases the batch precision of production and reduces the waste material rate, which plays an important role in the development of the home-made intelligent control system of road machinery.

A major component of a typical accelerator distributed control system (DCS) is a dedicated, large-scale local area communications network (LAN). The SNS EPICS-based control system uses a LAN based on the popular IEEE-802.3 set of standards (Ethernet). Since the control system network infrastructure is available throughout the facility, and since Ethernet-based controllers are readily available, it is tempting to use the control system LAN for fieldbus communications to low-level control devices. These devices may or may not be compatible with the communications protocols, traffic levels, etc. This paper presents some of the benefits and risks of combining high-level DCS communications with low-level field bus communications on the same network, and describes measures taken at SNS to promote compatibility between devices connected to the control system network.

A control system of a climbing welding robot based on CAN bus is proposed and designed in this paper. The robot is used for autonomous welding in the manufacturing and maintenance of large non-structure equipment. Under the working circumstance, it is suitable to establish the robot control system based on CAN bus. Compared with a traditional system, CAN bus has the advantage of high anti-interfering, high stability and high transfer rate. The 1st section is the introduction of the system; the 2nd section is a brief description of the robot’s structure. The 3rd section is the detailed design of the control system. The control system consists of three main parts: the establishment of a CAN bus, controlling of servo motors and receiving signals of sensors. The analyses of information, calculation of kinematic and overall control are all carried out in a PC. And the 4th section is the conclusion.

Aiming at the deficiency of redundancy strategies such as cold standby redundancy and replication redundancy used in existing dual CAN bus control systems, a design scheme of dual CAN bus hot redundancy communication based on pooling algorithm is proposed in the paper. The frame pool design method is proposed, focusing on the pool-input strategy based on the sending priority, introducing the design idea of the consumption task based on the competing sending mechanism, proposing the timeout pool-output mechanism of the consumption task, and realizing the hot redundant communication of dual CAN bus. The tests show that the design scheme based on this algorithm can achieve hot redundancy of dual CAN bus, which has strong application value in distributed control systems, power systems and automation, etc.

During the design of IVECO ISG hybrid electric vehicles (HEVs), the ISG electrical propelling system was inserted into the Duling IVECO vehicle. Thus the controller of ISG electrical propelling system constructed the distributed control system with the other controller. However, field bus is one of key techniques in the distributed control system. Firstly, CAN communication protocol for ISG controller based on the SAE J1939 CAN bus protocol was presented, then the hardware and software of ISG controller was designed in modular.

Device Description that is described as C-based DDL(Device Description Language) should be provided for the control system to use the progressive function of field device in the distributed control system. DD expresses field device function itself and parameter. DD is used to set a necessary function far a control strategy in the central control system. DD technology which was adopted as international standard IEC 61804-Part 2 is being used in PROFIBUS, Foundation Fieldbus and HART. However, the DD is dependent to the fieldbus and it doesn't have a suitable form in the industrial Ethernet. This paper presents the possibility of a change from EDD(Electronic Device Description) and GSD(General Slave Data) used for integrating field devices to XDD(XML for Device Description) and verifies it's effectiveness. Also, this paper presents research assignment on the XML application in the distributional system from now on by examining the possibility of Ethernet`s development in the industrial area.

In this paper, use micro-controllers, computers, communications, field bus, java and other technologies for flat screen printing machine constitutes control system architecture what horizontal dispersion, vertical hierarchical, realized the goal of information and operation management of decentralization and decentralized control, designed the framework of system, described the key technology of system development. User login through a browser, not only can operate a remote device and to obtain field data, but also through the operation of remote network cameras to observe the real production process. Moreover, CAN bus to transmit data with high precision and strong performance, and the running status of devices and production status of high transparency, can achieve the goal of digital printing and dyeing machinery. Not only that, but also saves the connection cable and a variety of installation and maintenance costs.

Cybersecurity for industrial control systems: A survey

<b> </b>Supervisory control and data acquisition (SCADA) systems and distributed control systems (DCS) were innovated to reduce labor costs, and to permit system-wide monitoring and remote control from a headquarter. Control systems are widely implemented in critical infrastructures such as electric grid, natural gas and petroleum, water, and wastewater industries. In this paper the structure and architecture of SCADA systems will be discussed. Since control systems can be vulnerable to different types of cyber attacks which could have destroying results and consequences, we have suggested methods and solutions for increasing security and preventing vulnerability of these systems.

The SCADA system applications in management of Yuvacik Dam and Reservoir

A general embedded remote monitoring system for industrial equipment has been designed based on Field Bus Technology and Internet Technology. The Field Bus includes PROFIBUS, CAN, RS-485 and RS-232. The data of the device controlled in the system can be detected and transmitted to PC via Internet. Upper monitor in the system is remote PC. Console computer, which can communicate with industrial equipment controller by Field Bus, is the controller of field data acquisition unit. Two working modes can be realized in the system. One is the data of operating status, which is gotten by Field Bus before transferred to PC. The other is the data of operating status, which is detected by field data acquisition unit in remote monitoring system. Maintenance and management becomes convenient after applying the remote monitoring system.

ICSs are typically used in Ethiopia in industries such as electric, water, sugar factories and different discrete types of manufacturing industries. These control a system which includes supervisory control and data acquisition (SCADA) systems, and distributed control systems (DCS) are critical to the operation of Ethiopian critical infrastructures that are becoming highly interconnected and mutually dependent systems. It is important to note that most of the nation's critical infrastructures and industrial processes mentioned above are publicly owned and operated. Thus, to minimize the risks of critical systems, preparing industrial control system security framework by considering Ethiopian Context is a must. In this paper, we prepare ICS security framework based on industry good practice from the fields of ICS and IT security and aims to help organizations address the challenges of increased use of standard IT technologies in the ICS environment. The paper provides recommended ICS security architecture, network security and communication protocol in the context of Ethiopian ICS requirement.

7 - Distributed control systems (DCS)