| 21. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
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Aspect-Oriented Programming for Manufacturing Automation Control Systems
- 2009
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Ingår i: 13th IFAC Symposium on Information Control Problems in Manufacturing Technology, INCOM’09, Moscow, Russia. - 1474-6670. - 9783902661432 ; :PART 1, s. 668-673
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Konferensbidrag (refereegranskat)abstract
- The languages defined by the standard IEC 6-1131 for Programm\-able Logic Controllers (PLCs), have both benefits and drawbacks compared to object-oriented programming languages. For example, the current programming approach is good for maintaining the system, since it is easy to program and comprehend for a plant floor personal with limited programming experience. The main drawbacks are reusability, code dependability and flexibility. This paper proposes an aspect-oriented programming (AOP) approach as an alternative solution, which can keep the benefits and eliminate the drawbacks. AOP is an emerging programming methodology in computer science, which helps the programmer by separating different crosscutting concerns in the program. These crosscutting concerns and tangled behavior are especially important issues in PLC programming, which makes AOP a suitable approach. The paper describes how to adapt the AOP methodology into PLC program development and how it can benefit the control design process.
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| 22. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
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Developing control logic using aspect-oriented programming and sequence planning
- 2013
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Ingår i: Control Engineering Practice. - : Elsevier BV. - 0967-0661. ; 21:1, s. 12-22
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Tidskriftsartikel (refereegranskat)abstract
- A fundamental functionality of a Programmable Logic Controller (PLC) is to control and execute a set of operations. But a large part of the program code is more involved in supporting the user with concerns like alarm, HMI, communication, safety and manual control. Code related to these supporting concerns is often tangled with operation execution code, the core concerns, which makes it hard to reuse.This paper describes a method to reuse code and functionality when developing PLC programs and code libraries. The method proposes that core concerns are planned with a software tool called Sequence Planner, and the supporting concerns are integrated into the core concerns with a tool based on aspect-oriented programming.
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| 23. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
Flexible Specification of Operation Behavior Using Multiple Projections
- 2014
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Ingår i: IEEE Transactions on Automation Science and Engineering. - 1558-3783 .- 1545-5955. ; 11:2, s. 504 - 515
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Tidskriftsartikel (refereegranskat)abstract
- The execution behavior of a system or a product can often be specified by a set of operations (sometimes called tasks, actions or activities). The process to specify these operations seems to be a real challenge in various situations, for example when designing automation systems or keeping track of the work at an emergency department. To be flexible during design and development, is about coping with uncertainty. However, in practice, specifying operation behavior is often quite inflexible because every possible execution route is explicitly defined. This approach is sometimes refereed to as point-based engineering, which is characterized by the early selection and approval of a single "best" specific solution. This approach can result in neither a robust nor a flexible design process with many rework iterations.
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| 24. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
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Operation Behavior Modeling using Relation Identification and Visualization Algorithms
- 2013
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Ingår i: IEEE International Conference on Automation Science and Engineering. - 2161-8070 .- 2161-8089. ; , s. 368 - 373
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Konferensbidrag (refereegranskat)abstract
- The behavior of a system can be described by a set of operations - sometimes called activities or tasks. The process to specify these operation seems to be a real challenge in various situations, for example when designing automation systems or keeping track of the work at an emergency department. In practice, operation behavior specification is often quite inflexible because every possible execution route is explicitly defined. In this paper, a modeling method and a relation identification and visualization algorithm is introduced that does not explicitly specify operation routes, where instead the operation behavior is specified using the execution restrictions in transition conditions for each operation. This enables the possibility to create multiple projections of the operation relations to enable better understanding.
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| 25. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
Operation-Oriented Specification for Integrated Control Logic Development
- 2009
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Ingår i: 2009 IEEE Conference on Automation Science and Engineering, CASE 2009, Bangalore, India. - 9781424445783 ; , s. 183-90
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Konferensbidrag (refereegranskat)abstract
- In order to develop a manufacturing automation system, it is necessary to understand the manufacturing operations and their relationship, the sequence of operations, which is the basis for control logic design. The operations have preconditions that define when they are allowed to start executing, which also defines the sequence relations among them. Requirements and demands throughout the development will add and change these conditions, which also changes the sequence of operations. This paper studies how an operation-oriented development approach better can handle the operations and manufacturing sequences from early product design to detailed control engineering. An operation is defined by an extended finite automaton, with an initial, executes and finished location. The start event is enabled by a precondition, the stop event is enabled by a postcondition and the reset event is enabled by a reset condition. This representation together with a resource and product description enables the possibility to integrate control logic in the complete development process.
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| 26. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
Patient coordination in emergency departments using an event-based information architecture
- 2014
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Ingår i: The 19th IEEE International Conference on Emerging Technologies and Factory Automation. - 9781479948451 ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- It is challenging to get an overview and understanding of the activities and their relations at an emergency department (ED). This is due to the complicated relations among activities - called operations in this paper - and the always changing system behavior. Two key enablers to get this overview are the transformation of real-time events into understandable information and an operation-based behavior description. This paper presents an event-based information architecture for healthcare (EVAH) for gathering state changing events in real-time at an ED and how these are transformed into an operation-based representation. EVAH together with the tool Sequence Planner, will be used for visualization, online prognosis and optimization.
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| 27. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
Patient coordination in emergency departments using visualization of operation behavior
- 2013
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Ingår i: Proceedings of the 2013 IEEE Symposium on Computational Intelligence in Healthcare and e-Health, CICARE 2013 - 2013 IEEE Symposium Series on Computational Intelligence, SSCI 2013. - 9781467358835 ; , s. 58-63
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Konferensbidrag (refereegranskat)abstract
- It is challenging to get an overview and understanding of the activities and their relations at an emergency department (ED). This is due to the complicated relations among activities called operations in this paper and the always changing system behavior. This paper presents a method to represent and visualize operations during the actual work at the ED that enables flexibility during modeling and actual care. By specifying operation behavior using only execution restrictions in transition conditions for each operation instead of fixed sequences, the method and related visualization tool can describe the ever changing and complex ED flows. Using the proposed approach, the ED staff will therefore have the possibility to in a better way coordinate the operations due to the increased overview.
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| 28. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
Relations Identification and Visualization for Sequence Planning and Automation Design
- 2010
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Ingår i: In Proc. IEEE Conference on Automation Science and Engineering, Toronto. - 9781424454471 ; , s. 841 - 848
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Konferensbidrag (refereegranskat)abstract
- The sequential behavior of a manufacturing system results from a number of constraints introduced both in product, manufacturing and control logic development. Sequence planning is therefore an important activity throughout the complete development process. This paper proposes a sequence planning approach using self-contained manufacturing operations that model actions and relevant execution conditions. These operations can have temporal relations with each other, due to execution constraints expressed by operation pre- post- and reset conditions. The operation relations can for example be parallel, sequence, arbitrary order, alternative or hierarchy. Based on a formal operation model, the relations among operations are identified and visualized with a graphical language called Sequences of Operations, SOP.
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| 29. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
Sequence Planning Using Multiple and Coordinated Sequences of Operations
- 2012
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Ingår i: IEEE Transactions on Automation Science and Engineering. - 1558-3783 .- 1545-5955. ; 9:2, s. 308-319
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Tidskriftsartikel (refereegranskat)abstract
- The sequential behavior of a manufacturing system results from several constraints introduced during the product, manufacturing, and control logic development. This paper proposes methods and algorithms for automatically representing and visualizing this behavior from various perspectives throughout the development process. A new sequence planning approach is introduced that uses self-contained operations to model the activities and execution constraints. These operations can be represented and visualized from multiple perspectives using a graphical and formal language called Sequences of Operations (SOPs). The operations in a manufacturing system are related to each other in various ways, due to execution constraints expressed by operation pre- and post-conditions. These operation relations include parallel, sequence, arbitrary order, alternative, and hierarchy relations. Based on the SOP language, these relations are identified and visualized in various SOPs and sequences. A software tool, Sequence Planner, has been developed, for organizing the operations into SOPs that visualize only relevant operations and relations. Note to Practitioners-This paper proposes methods and algorithms for a new sequence planning approach in which sequences are automatically created based on the relations among operations instead of having to be manually constructed. Using various views, the sequences of operations related to, for example, part flow, robot operations, and operator tasks, can be visualized. The use of various views helps the user better understand the relations between cell control and mechanical design, and between product design and total system behavior.
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| 30. |
- Bengtsson, Kristofer, 1979, et al.
(författare)
-
The Origin of Operations: Interactions Between the Product and the Manufacturing Automation Control System
- 2009
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Ingår i: 13th IFAC Symposium on Information Control Problems in Manufacturing Technology, INCOM’09, Moscow, Russia. ; , s. 40-5
-
Konferensbidrag (refereegranskat)abstract
- This paper investigates the interaction and relationship between the product design and the control logic design for manufacturing automation system. One important challenge during the development of a manufacturing automation system, is to handle the information related to the manufacturing control system (i.e PLC), since it influences almost every part of the manufacturing design and process. Therefore it is crucial to know when and how this information is created, to be able to increase the development quality and efficiency. This is especially true for the product related information that impacts the design of the control system. This paper studies the liaisons, the interfaces among parts and features in the product design, and its relationship with operations and resources in the manufacturing system. These liaisons must be considered in both product and manufacturing development since the inter-relation between liaisons and operations establishes the direct mapping of constraints and demands between the two domains. This paper further proposes how the manufacturing operations can be described during the development and how they are realized by resources in the manufacturing system. An example from automotive industry is included in this paper, to demonstrate the proposed concept.
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