Remote Monitoring System of DCS for JUNO

The Jiangmen Underground Neutrino Observatory (JUNO) is the state-of-the-art neutrino detector with large liquid scintillator mass. The Detector Control System (DCS) in the experiment needs to monitor many indicators, including environmental temperature, humidity and the operational status of the electronics hardware devices. This article describes a remote monitoring system, part of DCS, which is based on Experimental Physics and Industrial Control System (EPICS). The system collects environmental data through a Programmable Logic Controller (PLC), and collects the data of front-end hardware devices through a server. The Input/Output Controller (IOC) development of the front-end hardware devices based on the Modbus protocol and other non-standard protocols is realized on the EPICS platform, which will be communicating between the front-end hardware device and the server and will be archiving the data through the PyEPICS interface. The remote monitoring system includes the functions of data acquisition, data archiving, data monitoring and alarming. It can monitor the temperature, humidity in the laboratory and the operating parameters of the front-end hardware devices in real-time. Moreover, it plays an important role in the electronics system coordination and Photo-Mutiplier Tube (PMT) on-site test in JUNO. The application of this system in JUNO verified its effectiveness and stability, and also provided a useful experience for the design of monitoring systems for similar experiments.