Open communication plattforms for telecontrol applications:
benefits from the new standard IEC 60870-6 TASE.2 (ICCP)
Foreword Order information Contents Summary chapter 4
||"... Besides the first field experience, this report presents in more detail TASE.2 and the underlying ..."
- Utility Requirements
- Application examples
- MMS introduction
- some 110 pages DIN A4
Foreword to the 1st English edition
The demand for the first German edition of the etz report 28 in 1996 was so great that publisher and authors have decided to publish this second, updated and extended edition in Gerrnan and English.
In the meantirne the international standard IEC 60870-6 TASE.2 has been published and has found a worldwide distribution. All irnportant manufacturers of SCADA-, EMS- and DMS-systems offer TASE.2-compatible interfaces. The interconnected European utilities (organized in the UCPTE) have already decided to use TASE.2 for the networking of their control centers. Due to its application independent functionality and the availability of moderate cost solutions, TASE.2 is increasingly being used also for the communica-tion between controi centers and power plants or substations.
Besides the first field experience, this report presents in more detail TASE.2 and the underlying standard MMS (ISO/IEC 9506). I am convinced that it offers practical help to the power systems control experts regarding decisionmaking, planning and application of open communication systems.
Dr. Andreas Huber
Secretary of the IEC TC 57
(Power systems control and associated communications)
Nurernberg, May 1999
Die Deutsche Bibliothek - CIP-Einheitsaufnahme
Open communication plattforms for telecontrol applications : benefits frorn the new standard IEC 60870-6 TASE.2 (ICCP) > David Bauer, ...; Berlin - Offenbach : VDE VERLAG, 1999
(etz-Report ; 32)
VDE VERLAG GMBH, Berlin und Offenbach Bismarckstraße 33, D-10625 Berlin
There are just a few copies available through NettedAutomation! contact us ...
- Communications architecture
- Communication requirements
- Telecontrol Application Service Element Two (TASE.2)
- Working examples for TASE.2
- The UCPTE Real Time Information Communication Archltecture (URTICA)
- TASE.2 (ICCP) - A powerful communications protocol for control Systems
- Data communications between the four system control centres of the 110-kV grid and the main system controi centres of the 380-kV grid of the Energie-Versorgung Schwaben AG
- Applications of the Telecontrol Application Service Element (TASE.2) in the United States
- MMS - The Basis of the TASE.2 (IEC 60870-6-503 and -802) 27 pages
Summary chapter 4
4 Telecontrol Application Service Element Two (TASE.2)
Karlheinz Schwarz, Schwarz Consulting Company (SCC), Karlsruhe (Germany)
The IEC Technical Committee 57 "Power Systems Control and Associated Communications" has standardized functions, protocols, devices and systems for tele-control applications (standards IEC-60870-x-y). The parts 60870-6-y define "Telecontrol Protocols compatible with ISO-Standards and ITU-Recommendations" for the communication in the area of power control. The Inter-Control Center Communications Protocol (ICCP synonym TASE.2) has the status "International Standard" (IS).
The standard "Manufacturing Message Specification" (MMS, ISO/IEC 9506) forms the basis for the TASE.2 . TASE.2 enables the uniform real-time communication of thousands of heterogeneous systems via local area networks, WAN, fieldbusses, including networks like X. 25, TCP/IP, ISDN or ATM. The data exchange as well as functions such as for the data acquisition and control of devices (Supervisory Control and Data Acquisition, SCADA) have to be understood as communication. TASE.2 defines open functions and an object model for application data in control systems. TASE.2 supports the integration of control systems into the corporate wide information and data processing.
TASE.2 offers a series of common functions, i.e. application independent functions. At first these solutions were intended for the communication between control centers. Very soon it became clear, that TASE.2 can also be used in many other applications. MMS and TASE.2 offer suitable solutions for the communication:
- between control centers in electric, gas and water utilities,
- between utility networks and power plants,
- within power plants,
- between control centers and substations,
- in process control related systems as well as
- in all areas of industrial automation.
This chapter describes the historical development and shows the future prospect of open communication systems in utility networks. In the second place, the functions of TASE.2 are presented.
4.2 TASE.2 is based on proven technology
4.2.1 Motivation, history, associated field
The energy markets are characterized by the deregulation worldwide. Production, transport, distribution and sale of electric energy were carried out by a single enterprise till now. In future, these units will form independent companies and compete with each other. Thus, it is becoming possible that a company sells energy of power stations belonging to different companies.
The deregulation has the consequence, that automation systems of different manufacturers must communicate with each other. A number of new communication interfaces will arise between the automation systems of these companies, which cannot be determined by one company any more.
One of the largest problems facing utilities today is that their existing control systems don't exchange information effectively. That is, the control systems are mostly pretty good for their local task, but put together, they do not add up to a good common solution for the whole grid. No one debates that the integration problem is serious, or that there is enormous potential value in a better solution.
The general starting condition for the problem is similar everywhere:
- The utility has already invested in many applications for the various parts of the business. These systems were purchased at various different times, specified and built by different teams or vendors, and designed primarily for their local purpose, largely independent of any common architecture. They run on many different platforms.
- The utility has more recently deployed extensive high-speed networking infrastructure, together with desk-top suites for its employees, so that the basic infrastructure for connecting systems and personnel is in place.
- The utility has been investing (and continues to invest) in special purpose bridges to move information between applications, and in databases to consolidate information. The effect is to create more and more applications, more maintenance problems, less flexible design. In other words, even though the information can be transferred, each addition increases the overall complexity and gradually worsens the costs and response times for further changes.
What the utilities need is a simple way to start from where they are, and address the need to exchange information between control centers in a way that systematically converges toward a good common solution. The approach must be incremental, maintain good cost/benefit decision-making, and facilitate the evolution of industry standards and industry standard product interfaces, so that it supports and encourages continuing improvements in the design of the applications themselves.
TASE.2 was developed as an open interface by the US American energy utility providers in cooperation with manufacturers of control systems. In the main, TASE.2 fulfills these requirements.
The design goals of TASE.2 were:
- higher safety of the plant,
- lower costs of components,
- reduced costs for installation and operating,
- shorter times for planning, design and installation,
- simplified selection of the devices and systems,
- increasing interoperability,
- lower training costs,
- higher usage of the operating resources,
- vendor independency,
- more support by the supplier, and
- use of generally available industrial solutions.
In order to achieve these goals, already available standards are applied. These were published in the context of open systems by the "International Standardization Organization" (ISO).
The benefit of standardized interfaces depends on technical and also non-technical factors like the availability of the products or the variety of the solutions. Potentials of rationalization have to be evaluated taking all aspects into account. The bare comparison which communication system or which coding is quicker or cheaper results in negligible savings. In an examination at Mercedes Benz (Germany) it was recognized that the hardware and software costs for the communication (wire, communication controller board, protocol software, driver software etc.) merely make up 10% of all networking costs (figure 4.1). Always recurrent costs during the complete life cycle of a system far outweigh the original hardware and software costs ...