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Article
Publication date: 1 March 2003

Donal Heffernan and Don Murphy

The hardware and software development of a remotely controlled hydraulic valve assembly is described. The valve becomes a dedicated server in a distributed control…

Abstract

The hardware and software development of a remotely controlled hydraulic valve assembly is described. The valve becomes a dedicated server in a distributed control environment. The communication system is an Ethernet network supporting the UDP/IP communications protocol. A client/server application model is developed that allows a client to specify a desired control position for a valve spool. The solution is being proposed as an alternative to a formal fieldbus solution, where precision real‐time operation is not required. The performance of the valve is measured under different configurations considering both open loop and closed loop models. The justification for selecting the UDP/IP protocol is stated. The resulting hydraulic valve control system is efficient, accurate and flexible.

Details

Assembly Automation, vol. 23 no. 1
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 8 May 2007

Margaret Naughton and Donal Heffernan

This paper aims to describe the development of a new software tool for the scheduling of real‐time control messages in a time‐triggered control network. The prime…

Abstract

Purpose

This paper aims to describe the development of a new software tool for the scheduling of real‐time control messages in a time‐triggered control network. The prime application area for such a solution is in real‐time robotic controllers and other similar machine control systems.

Design/methodology/approach

The design of a scheduling tool, called SMART‐Plan, is described. The tool is based on a “least slack time” scheduling policy. A prototype tool for the time‐triggered controller area network (TTCAN) is developed. The design is validated against Society of Automotive Engineers Benchmark and a formal verification of the message schedule is also proposed.

Findings

The research findings show that it is feasible to develop such a message scheduling tool and the performance of the tool is comparable with other research solutions, which have been applied in the past to simple periodic schedulers, as opposed to time‐triggered networks.

Research limitations/implications

Although the prototype solution assumes a TTCAN control network, the concept will also be feasible for other types of time‐triggered control networks. The availability of such a tool might encourage developers of robotic equipment to adopt the time‐triggered network approach for the architectural development of such control systems. To date, the problems associated with the message scheduling of such time‐triggered systems have been an inhibitor to such developments.

Originality/value

This is a new scheduling approach to the message scheduling of time‐triggerred control networks.

Details

Industrial Robot: An International Journal, vol. 34 no. 3
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 1 September 2004

Donal Heffernan and Paula Doyle

In industrial distributed control environments for automation technology, Ethernet network based solutions are gaining prominence in the traditional fieldbus application…

Abstract

In industrial distributed control environments for automation technology, Ethernet network based solutions are gaining prominence in the traditional fieldbus application areas with the promise of standardised solutions that can support real‐time operation to a resolution of less than 1 μm. However, there are no formal standards for a real‐time Industrial Ethernet. This paper looks at some of the emerging de facto solutions and describes a novel project where clusters of real‐time transducer networks are developed and the control is tightly synchronised using the IEEE 1588 clock synchronisation standard, realising a “Time‐triggered Ethernet” solution.

Details

Assembly Automation, vol. 24 no. 3
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 7 August 2007

Hassan Kaghazchi, Ronan Joyce and Donal Heffernan

This paper sets out to highlight the problem associated with the development of fieldbus diagnostics in a multi‐vendor environment and to propose a solution based on…

Abstract

Purpose

This paper sets out to highlight the problem associated with the development of fieldbus diagnostics in a multi‐vendor environment and to propose a solution based on diagnostic function blocks (FB).

Design/methodology/approach

The work focuses on the “master‐slave” communication model in a PROFIBUS fieldbus system, where three different vendor solutions are investigated.

Findings

Although the fieldbus standards specify the type and format of the diagnostics data, the extent, location and sequence of diagnostics data within a controller are entirely vendor‐dependent. The outcome from this work defines a framework for representing the diagnostics data in the context of a special function block.

Originality/value

This research work defines a novel unified framework for representing the fieldbus diagnostics data using FB for multi‐vendor solutions in a PROFIBUS environment.

Details

Assembly Automation, vol. 27 no. 3
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 1 January 2006

Conal Watterson, Donal Heffernan and Hassan Kaghazchi

To emphasise the need for remote fieldbus diagnostics and to show a technical solution based on industry standard approaches.

Abstract

Purpose

To emphasise the need for remote fieldbus diagnostics and to show a technical solution based on industry standard approaches.

Design/methodology/approach

The design and approach takes a Profibus fieldbus, as an example candidate, and captures the diagnostic data using an OPC model and then uses a Java RMI object broker to develop/support the remote end clients.

Findings

The findings show, by an implementation example, that it is possible to implement remote diagnostics for a fieldbus network, without interfering with the operation of the network. The findings also highlight the need for security in such a solution.

Research limitations/implications

The implementation example is rather cumbersome, but the paper suggests that all the hardware and software could be implemented on a single embedded processor in a single box. The security issues are flagged as a possible limitation, but solution approaches are briefly suggested.

Practical implications

The paper highlights the lack of standardisation around fieldbus diagnostics. Even for the same fieldbus type, different manufacturers will use different diagnostic protocols and codes. This paper suggests a practical implementation, where the diagnostic codes can be interpreted a fixed stage and presented to an end client in a consistent manner.

Originality/value

This work is based on a two year original research project. The solution makes heavy use of industry standard protocols but the work is original.

Details

Assembly Automation, vol. 26 no. 1
Type: Research Article
ISSN: 0144-5154

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Article
Publication date: 1 March 2002

Donal Heffernan and Gabriel Leen

The CAN (Controller Area Network) standard, ISO 11898, is now ubiquitous in industrial automation environments. CAN is used with defined application layers for…

Abstract

The CAN (Controller Area Network) standard, ISO 11898, is now ubiquitous in industrial automation environments. CAN is used with defined application layers for implementing sensor/actuator level distributed control applications. Protocols such as Honeywell's SDS, ODVA's DeviceNet (Allen Bradley) and CANopen are well‐known device level networks which are based on the CAN protocol. A new time‐triggered protocol for CAN, referred to as TTCAN, is under development where the real‐time scheduling of the network traffic can be formally verified. This paper introduces the new TTCAN protocol and suggests that TTCAN has the potential to provide new solutions in industrial automation applications. TTCAN has the potential to replace some conventional pneumatic, hydraulic and other mechanical safety‐critical control systems with a reliable electronic network. The emergence of 42‐volt technology from the automotive world will further complement the TTCAN technology to provide some unique industrial automation solutions.

Details

Assembly Automation, vol. 22 no. 1
Type: Research Article
ISSN: 0144-5154

Keywords

Content available
Article
Publication date: 1 January 2006

Abstract

Details

Sensor Review, vol. 26 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

Content available

Abstract

Details

Sensor Review, vol. 25 no. 2
Type: Research Article
ISSN: 0260-2288

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Content available
Article
Publication date: 26 January 2010

Abstract

Details

Sensor Review, vol. 30 no. 1
Type: Research Article
ISSN: 0260-2288

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Article
Publication date: 24 August 2020

Tuan Quoc Le, Ha Ngan Duong and Phuong Thanh Nguyen

This paper aims to investigate the decisions of listing for Vietnamese banks and the impact of listing on bank performance.

Abstract

Purpose

This paper aims to investigate the decisions of listing for Vietnamese banks and the impact of listing on bank performance.

Design/methodology/approach

A longitudinal data set of 30 commercial banks in the period of 2006–2018 with various univariate and multivariate tests is used.

Findings

This study found that listing is positively associated with bank profitability. The results are consistent even after the control for potential endogeneity problems by propensity score matching methodology and Heckman selection bias models. Further analysis suggests some new alternative channels for the positive impact, namely, the increased quality of information disclosure, technological development and income diversification of commercial banks after listing.

Practical implications

Hence, this paper provides recommendations and policy implications for regulatory bodies regarding the listing of commercial banks in Vietnam.

Originality/value

The contributions to the literature are three-folds. First, this study contributes to a strand of literature on the impact of going public [initial public offering (IPO)/listing] of financial institutions on their performance. While the literature on non-financial firm performance post-going public is ample, few have directly considered the IPO/listing of banks and other financial institutions. Second, in further looking at the impact of listing on bank performance, this study also sheds some light on the new possible channels of the effect and provides evidence of new channels. Then, last but not least, the case of Vietnam could possibly yield interesting results for a transitory stock market. From the evidence, the recommendations and policy implications for a listing of Vietnamese banks are provided.

Details

Journal of Financial Regulation and Compliance, vol. 29 no. 2
Type: Research Article
ISSN: 1358-1988

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