Supporting Real-Time Distributed Computer-Controlled Systems with Multi-hop P-NET Networks
Ref: HURRAY-TR-9911 Publication Date: Aug 1999
Supporting Real-Time Distributed Computer-Controlled Systems with Multi-hop P-NET NetworksRef: HURRAY-TR-9911 Publication Date: Aug 1999
Fieldbus communication networks aim at the interconnection of sensors, actuators and controllers within process control applications. Therefore, they constitute the basis upon which real-time distributed computer-controlled systems can be implemented. P-NET is a fieldbus industrial communication standard, which uses a virtual token passing medium access control mechanism. In this paper we establish pre-run-time schedulability conditions for supporting real-time traffic with P-NET networks. Essentially we provide formulae to evaluate the upper bound end-to-end communication delay of P-NET messages. Using this upper bound, a feasibility test is provided to check the timeliness requirements for accessing remote process variables. This paper also shows how P-NET network segmentation can significantly reduce the end-to-end communication delay of messages with stringent timing requirements.
Published in Control Engineering Practice, Elsevier Science., Volume 7, Issue 8, pp 1015-1025.
Supporting Real-Time Distributed Computer-Controlled Systems with Multi-hop P-NET Networks (30, Dec, 1899 Outdated)