The Positioning of Control Valves in Digital Control Systems

1981 ◽  
Vol 14 (12) ◽  
pp. 443-445
Author(s):  
A. J. Hinkins ◽  
J. M. Malcolm ◽  
R. I. Little
Keyword(s):  
Process Control ◽  
Control Systems ◽  
Digital Control ◽  
Positioning Systems ◽  
Control Valves ◽  
Control Loops ◽  
Digital Control Systems ◽  
History Of ◽  
Functional Layout ◽  
Direct Digital Control

The history of valve positioning systems on process control loops is reviewed. The advent of single loop micro-processor based controllers makes possible an improved functional layout for such systems, which has previously found application on direct digital control systems. If this new layout should find support within the industry, then some form of national co-ordination of the development of interface standards would be desirable.

scholarly journals Worst-Case Analysis of Digital Control Loops with Uncertain Input/Output Timing

10.29007/c4zl ◽  
2019 ◽  
Author(s):  
Maximilian Gaukler ◽  
Peter Ulbrich
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Worst Case Analysis ◽  
Real Time Systems ◽  
Input Output ◽  
Worst Case ◽  
Control Loops ◽  
Digital Control Systems ◽  
Uncertain Input ◽  
Time Systems

Benchmark Proposal: The implementation of digital control systems in complex multi- core or distributed real-time systems results in non-deterministic input/output timing. Such timing deviations typically lead to degraded performance or even instability, which in turn may jeopardize safety goals. We present the problem of proving worst-case guarantees for given input/output timing bounds as a benchmark for the verification of hybrid dynamical systems.

scholarly journals DIRECT DIGITAL CONTROL IN A COMPLEX OF SOFTWARE DESIGN OF DIGITAL CONTROL SYSTEMS

2017 ◽  
Vol 3 ◽  
pp. 337
Author(s):  
Sergei Verteshev ◽  
Vladimir Konevtsov
Keyword(s):  
Automatic Control ◽  
Programming Languages ◽  
Control Systems ◽  
Software Design ◽  
Digital Control ◽  
Computer Aided Design ◽  
Digital Controllers ◽  
International Standard ◽  
Digital Control Systems ◽  
Direct Digital Control

This article provides the functionality of creating direct digital control devices in the computer-aided design of digital automatic control systems (CAD of digital ACS), in a complex of software design of digital control systems (SDSDC complex) for automated process control systems. Technical tools are defined by the international standard IEC 61131-1: 2003 (Part 1: General data). The possibility of implementing SDSDC complex in direct digital control, single-cycle and multi-cycle ladder diagrams, identification of objects of management and synthesis of digital controllers in comparison with the international standard IEC 61131-3: 2003 (Part 3: Programming Languages) are evaluated. Users’ productivity is estimated as well as the possibility of its separation between the users at different stages of the design of digital systems of automatic control is assessed.

The Use of a Digital Computer for On-Line Control of a Jet Engine

1967 ◽  
Vol 71 (676) ◽  
pp. 252-256
Author(s):  
E. S. Eccles
Keyword(s):  
Control System ◽  
Process Control ◽  
Control Systems ◽  
Digital Computer ◽  
Digital Control ◽  
Control Function ◽  
Computer Control ◽  
Jet Engines ◽  
Digital Control Systems ◽  
Potential Applications

SummarySome of the unusual factors influencing the choice of digital computer control systems for jet engines are discussed first. The conditions differ in various practical respects from conventional process control applications. Having several identical plants in a typical aircraft and the need for flexibility to keep pace with engine development are of particular importance. Approaching digital control with the traditional process control background may be restrictive in selecting potential applications for the technique.Techniques which can be used with computers to simplify and speed up three aspects of the realisation of a practical system are described briefly. The first of these is the measurement of the actual plant characteristics needed in the analysis of the control system requirements. The second is a method of obtaining good response in the synthesis of a non-linear control function. The third is a technique for programme writing and for simulation used in the verification of the control system behaviour.The techniques described are not in themselves necessarily confined to use with digital control systems and should have value in general use.

scholarly journals DIRECT DIGITAL CONTROL IN A COMPLEX OF SOFTWARE DESIGN OF DIGITAL CONTROL SYSTEMS

2017 ◽  
Vol 3 ◽  
pp. 332
Author(s):  
Sergei Verteshev ◽  
Vladimir Konevtsov
Keyword(s):  
Automatic Control ◽  
Programming Languages ◽  
Control Systems ◽  
Software Design ◽  
Digital Control ◽  
Computer Aided Design ◽  
Digital Controllers ◽  
International Standard ◽  
Digital Control Systems ◽  
Direct Digital Control

This article provides the functionality of creating direct digital control devices in the computer-aided design of digital automatic control systems (CAD of digital ACS), in a complex of software design of digital control systems (SDSDC complex) for automated process control systems. Technical tools are defined by the international standard IEC 61131-1: 2003 (Part 1: General data). The possibility of implementing SDSDC complex in direct digital control, single-cycle and multi-cycle ladder diagrams, identification of objects of management and synthesis of digital controllers in comparison with the international standard IEC 61131-3: 2003 (Part 3: Programming Languages) are evaluated. Users’ productivity is estimated as well as the possibility of its separation between the users at different stages of the design of digital systems of automatic control is assessed.

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