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Terminology_and_Symbols_in_Control_Engineering

Terminology_and_Symbols_in_Control_Engineering - Technical...

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Part 1 Fundamentals Terminology and Symbols in Control Engineering Technical Information 1
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Part 1: Fundamentals Part 2: Self-operated Regulators Part 3: Control Valves Part 4: Communication Part 5: Building Automation Part 6: Process Automation Should you have any further questions or suggestions, please do not hesitate to contact us: SAMSON AG Phone (+49 69) 4 00 94 67 V74 / Schulung Telefax (+49 69) 4 00 97 16 Weismüllerstraße 3 E-Mail: [email protected] D-60314 Frankfurt Internet: http://www.samson.de Technical Information
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Terminology and Symbols in Control Engineering Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Terminology in Control Engineering . . . . . . . . . . . . . . . . . . 6 Open loop control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Closed loop control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Control loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Abbreviations of variables relating to closed loop control. . . . . . . . . 10 Symbols in Control Engineering . . . . . . . . . . . . . . . . . . . 12 Signal flow diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Blocks and lines of action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Device-related representation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Instrumentation and control tags . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Control Systems and Structures . . . . . . . . . . . . . . . . . . . . 22 Fixed set point control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Follow-up control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Cascade control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Ratio control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Appendix A1: Additional Literature. . . . . . . . . . . . . . . . . . 26 3 Part 1 L101 EN SAMSON AG 00/03 CONTENTS
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Preface The technical informations presented in this document are based on defini- tions according to DIN, the German organization of standardization (Deut- sches Institut für Normung). Continuous efforts are being made to determine international definitions in order to achieve an increasing similarity in the ter- minology used. Nevertheless, differences in designations and representa- tions do exist in international use. Literature presented at the end of this document includes international standards and publications relating to DIN standards, or being derived from them. Representations and text sections referring to DIN are often cited in short form, summarizing the contents. The precise facts must always be read - also because of possible extensions or amendments - in the current edition of the respective standard. 4 Fundamentals Terminology and Symbols in Control Engineering SAMSON AG V74/ DKE
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Introduction Planning, design and start-up of process control systems require clear and unambiguous communication between all parts involved. To ensure this, we need a clear definition of the terms used and as far as the documentation is concerned standardized graphical symbols. These symbols help us represent control systems or measurement and control tasks as well as their device-related solution in a simple and clear manner. 5 Part 1 L101 EN SAMSON AG 00/03
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Terminology in Control Engineering To maintain a physical quantity, such as pressure, flow or temperature at a desired level during a technical process, this quantity can be controlled either by means of open loop control or closed loop control. Open loop control In an open loop control system, one or more input variables of a system act on a process variable. The actual value of the process variable is not being checked, with the result that possible deviations e.g. caused by disturban- ces are not compensated for in the open loop control process. Thus, the cha- racteristic feature of open loop control is an open action flow.
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