| dc.contributor.advisor | Henry, Fergal | en |
| dc.contributor.advisor | McCormack, Brendan | en |
| dc.contributor.author | Loughlin, Shane | en |
| dc.date.accessioned | 2017-03-21T11:10:12Z | |
| dc.date.available | 2017-03-21T11:10:12Z | |
| dc.date.issued | 2004-09 | |
| dc.identifier.citation | Loughlin, S. (2004). Evaluation of the determinism of the actuator sensor interface (ASI) on programmable logic controllers (PLC), personal computers (PC) and real-time operating systems (RTOS). MEng, Institute of Technology, Sligo | en |
| dc.identifier.other | MEng | en |
| dc.identifier.uri | https://research.thea.ie/handle/20.500.12065/645 | |
| dc.description | The purpose of this study was to evaluate the determinism of the AS-lnterface
network and the 3 main families of control systems, which may use it, namely
PLC, PC and RTOS. During the course of this study the PROFIBUS and
Ethernet field level networks were also considered in order to ensure that they
would not introduce unacceptable latencies into the overall control system. This
research demonstrated that an incorrectly configured Ethernet network
introduces unacceptable variable duration latencies into the control system,
thus care must be exercised if the determinism of a control system is not to be
compromised. This study introduces a new concept of using statistics and
process capability metrics in the form of CPk values, to specify how suitable a
control system is for a given control task. The PLC systems, which were tested,
demonstrated extremely deterministic responses, but when a large number of
iterations were introduced in the user program, the mean control system latency
was much too great for an AS-I network. Thus the PLC was found to be
unsuitable for an AS-I network if a large, complex user program Is required. The
PC systems, which were tested were non-deterministic and had latencies of
variable duration. These latencies became extremely exaggerated when a
graphing ActiveX was included in the control application. These PC systems
also exhibited a non-normal frequency distribution of control system latencies,
and as such are unsuitable for implementation with an AS-I network. The RTOS
system, which was tested, overcame the problems identified with the PLC
systems and produced an extremely deterministic response, even when a large
number of iterations were introduced in the user program. The RTOS system,
which was tested, is capable of providing a suitable deterministic control system
response, even when an extremely large, complex user program is required. | en |
| dc.format | PDF | en |
| dc.language.iso | en | en |
| dc.subject | Microcomputers -- Programming | en |
| dc.subject | Programmable logic devices | en |
| dc.subject | Programmable controllers | en |
| dc.subject | Embedded computer systems -- Programming | en |
| dc.title | Evaluation of the determinism of the actuator sensor interface (ASI) on programmable logic controllers (PLC), personal computers (PC) and real-time operating systems (RTOS) | en |
| dc.type | Master thesis (research) | en |
| dc.publisher.institution | Institute of Technology, Sligo | en |
| dc.rights.access | Creative Commons Attribution-NonCommercial-NoDerivs | en |
| dc.subject.department | Mechanical and Electronic Engineering ITS | en |
