Development of EPICS device support on the MELSEC iQ-R embedded Linux controller
Year: 2025
Type: conference-paper
Abstract: At the RIKEN Radioactive Isotope Beam Factory (RIBF), commercial PLCs are used in various accelerator subsystems. Among them, the Yokogawa FA-M3 series with a Linux CPU module running EPICS IOC has been successfully adopted. Following this model, and in response to user requests, we implemented a similar architecture using the embedded Linux controller (RD55UP12-V) of Mitsubishi Electric’s MELSEC iQ-R series. Conventional MELSEC-based integration with EPICS has relied on asynchronous device support communicating over TCP/IP (e.g., MC protocol). These approaches often face reliability issues, such as socket disconnections and failed reconnections after network disruptions. To address these problems, we developed a native EPICS device support that runs directly on the MELSEC Linux CPU. A Python-based prototype using PyDevice was first created for rapid development and verification, incorporating a thread-safe worker architecture. Based on its success, we re-implemented the support in C++ using the asynPortDriver class of the EPICS asynDriver module. The C++ version provides improved performance, robust multithreading, and better maintainability. This paper presents the development process, differences between the Python and C++ implementations, and results from system integration within the RIBF control environment.
Source: JACOW
Authors: Uchiyama,Akito, Yamada,Kazunari, Komiyama,Misaki, Fukunishi,Nobuhisa
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7109011073
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