Terminology and Symbols in Control Engineering

Technical Information
Part 1:
Fundamentals
Part 2:
Self-operated Regulators
Part 3:
Control Valves
Part 4:
Communication
Part 5:
Building Automation
Part 6:
Process Automation

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

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