First steps with INTERBUS System Technology Basics INTERBUS INTERBUS - The Sensor/Actuator Bus A complete system overview with which you can quickly and easily www.stevenengineering.com find answers to your questions on the INTERBUS system. You will also get the know-how required for a first general decision on the 9200 - 8 fieldbus topic and especially on INTERBUS. Any questions, suggestions, help, etc. Send mail to: WebMaster [email protected] Outside Local Area: (800) 25 9200 - 8 Main Office: (650) 58 6370 - 230 Ryan Way, South San Francisco, CA, 94080 Courtesy of Steven Engineering, Inc. [Top] [Prev] [Next] [End] Contents 1. Preface to the INTERBUS Club 2. INTERBUS at the Center of Automation www.stevenengineering.com 2.1 Introduction 9200 - 2.2 INTERBUS and Standardization 8 3. INTERBUS Technology 3.0.1 Demands of Sensors/Actuators on a Bus System 3.0.2 A Comparison of Data Transmission Methods 3.0.3 INTERBUS, the Sensor/Actuator Bus 3.0.3.1 INTERBUS Topology Outside Local Area: (800) 25 3.0.4 The INTERBUS Transmission Protocol 9200 - 8 3.0.5 Technical Implementation of the Transmission Protocol 3.0.6 The User Interface 3.0.6.1 PMS Services 3.0.7 Practical Application of INTERBUS Main Office: (650) 58 3.0.8 Standardized Start up, Operation and Diagnostics with the INTERBUS Manager CMD 6370 - 3.0.9 INTERBUS Loop 3.0.10 Standardized Networking with INTERBUS 3.0.11 Device Interoperation with Profiles 3.0.12 INTERBUS Products and Manufacturers 3.1 Open Architecture in the PLC World using INTERBUS 3.2 Open Control 3.2.1 INTERBUS with PC-based Control Technology 4. INTERBUS in Action 230 Ryan Way, South San Francisco, CA, 94080 5. The Way to INTERBUS-compatible Devices 5.1 Test and Certification 5.2 The INTERBUS Club 5.2.1 Your Way to the INTERBUS Club 5.4 INTERBUS Club International Courtesy of Steven Engineering, Inc. [Top] [Prev] [Next] www.stevenengineering.com 9200 - 8 Copyright ©1997,INTERBUSClubAllrightsreserved. Outside Local Area: (800) 25 9200 - 8 Main Office: (650) 58 6370 - 230 Ryan Way, South San Francisco, CA, 94080 Courtesy of Steven Engineering, Inc. 1. Preface to the INTERBUS Club Serial field bus technology is increasingly meeting with international acceptance in all areas of industrial applications, starting with the automotive industry through to process engineering, materials handling, logistics, shipping, food processing, paper and timber industries and so on. Every sector in which industrial control technology is used is suited for this relatively new technology. The INTERBUS Club has published this brochure in order to provide potential users and manufacturers of INTERBUS-compatible devices with a technical overview of the functionality, efficiency, delimitations, and applications of INTERBUS. In the opening section it deals with the trend within open automation technology, further explains the INTERBUS protocol, points out possible areas of application and gives tips www.stevenengineering.com on the implementation of the devices. 9200 - All in all, what we are presenting you, the technically interested user or manufacturer, is a comprehensive 8 document that serves to assist you in your further steps toward INTERBUS. 2. INTERBUS at the Center of Automation 2.1 Introduction In the entire field of modern automation technology, new ways of electrically equipping machines and plants are under development. The enormous competitive and cost pressure which weighs heavily on all Outside Local Area: (800) 25 areas of production and process enginee-ring, necessitates the exploitation of existing rationalization potentials. From this point of view, the conventional parallel wiring of sensors and actuators in a machine or 9200 - 8 system turns out to be inflexible and a serious cost and time factor. A remedy for this is the serial networking of the components on the lowest level of the automation hierarchy by means of so-called "fieldbus systems". This represents a great opportunity to reduce costs. Main Office: (650) 58 6370 - 230 Ryan Way, South San Francisco, CA, 94080 At the same time, the increasing globalization of the markets is making new demands on systems and mechanical engineers regarding the solutions in control technology. The world of automation technology is no longer homogenous but is in stead dominated by national or regional market leaders. Machine and plant constructors operating internationally have to take these conditions into account. At the same time, being competitive on the international market means that an automation solution must be standardized and able to be used worldwide without major alterations. The result of this has been the demand for open modular control architectures which can be accepted worldwide or, with slight modifications, adapted to national Courtesy of Steven Engineering, Inc. preferences. www.stevenengineering.com 9200 - 8 Future automation systems will therefore be based on flexible control systems, the performance and function of which can be adapted to changing requirements without interrupting the system. Under this aspect, changing the control system or the control system manufacturer should not affect the other Outside Local Area: (800) 25 automation components. One precondition for these open control architectures, which result in considerable cost savings over the complete lifetime of the machine or system, is standardization in all 9200 - areas of control technology. This stand-ardization is already happening in many cases. In future, 8 manufacturer-specific programming languages will be replaced by the international standard IEC 1131. Since the introduction of the PC, special hardware for programming devices has become a thing of the past. These trends enable users to interchange and freely select their control system. In terms of control hardware too, the standard industrial PC is coming to the fore and beginning to oust the inflexible, manufacturer-specific hardware platforms. Another precondition for a truly open automation system is a standardized connection between the different makes of control systems and the wide range of process Main Office: (650) 58 peripheral equipment currently available on the market. The solution to this problem is the implementation of serial bus systems which, apart from offering all the above-mentioned advantages, can also effect a 6370 - standardization of the link between control system and peripheral equipment. 230 Ryan Way, South San Francisco, CA, 94080 Courtesy of Steven Engineering, Inc. To meet the future challenges of an seamless flow of information and the support of open and flexible control architectures in automation engineering already mentioned, bus systems in the field of sensors/actuators must meet two essential requirements. The bus system must provide the user with a universal solution for his automation task. For applications in open control architectures, it must feature independence and neutrality towards major PLC suppliers. Today, most solutions available on the market fail to meet these two requirements. www.stevenengineering.com 9200 - 8 Outside Local Area: (800) 25 9200 - 8 The necessary neutrality of the PLC manufacturers, which ensures interchange- ability of the control technology while using the existing process peripheral equipment, is often lacking. Each system represented on today's market is only supported by one of the major PLC manufacturers. The German Main Office: (650) 58 PROFIBUS fieldbus is supported by the PLC manufacturer Siemens, DeviceNet by Allen-Bradley and FIP by Telemecanique. The availability of the system and its efficiency depend on the PLC manufacturer's 6370 - interest in an open solution and can therefore not be guaranteed for any length of time. With this kind of "controlled openness", many manufacturers are attempting to create new dependencies and reestablish customer ties, previously achieved with special operating systems, programming devices and languages. To emulate a seamless solution for automation tasks (from the PLC via remote peripheral equipment to discrete sensors and actuators), many systems must rely on a variety of different partial solutions due to a lack of technical capability. By marketing products under a single name, manufacturers attempt to convey the impression of a "pseudo universality". In reality, however, users are suddenly confronted with two, three or even four completely different systems in their plants. This becomes evident for example in the case of PROFIBUS with the variants, "FMS", "DP", "DP+" and "PA", or, in the case of Allen-Bradley, with the network structure, Data Highway, Control Net and Device Net. This multitude of variants increases time and costs for training, maintenance, stockkeeping, tools etc. and does not exactly enhance reliability of the plants. Justification for this variety of systems is often sought in theoretical hierarchy boundaries. However, the actual reason for this assortment of fieldbuses, as is the case with PROFIBUS and DeviceNet, is the lack of suitability of the implemented transmission protocols for use in the field of sensors and actuators. In 230 Ryan Way, South San Francisco, CA, 94080 order to create a seamless applicable protocol, from the control level through to discrete sensors and actuators, the protocol must be designed with the very special requirements of the "critical" area of sensor and actuator technology in mind. In contrast to the range of networks dominated by PLC manufacturers, INTERBUS provides a neutral and seamless solution which has been