DeMon++: A framework for designing and implementing Distributed Monitoring Systems based on Hierarchical Finite State Machines
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In today’s interconnected world, the proliferation of diverse and numerous devices
has become increasingly common. This phenomenon is particularly evident in the
field of industrial computing, which has experienced rapid growth. With this rapid
expansion, monitoring an industrial control system (ICS) consisting of a large num-
ber of devices becomes a critical activity. To evaluate our approach, we chose the
CERN ICS as a suitable case study for our research. The CERN ICS is a complex
network of thousands of heterogeneous control devices, including PLCs, front-end
computers, supervisory control and data acquisition systems. Our approach resulted
in DeMon++, a framework for designing and implementing distributed monitoring
systems. DeMon++ uses the concept of hierarchical finite state machines to model
the system, capturing the hierarchical relationship between devices. In particular,
DeMon++ aims to be a flexible, scalable and maintainable monitoring framework
to abstract, aggregate and summarise the health state of industrial control sys-
tems composed of a heterogeneous set of devices. As part of the CERN OpenLab
programme, this thesis provides a flexible and maintainable approach to monitoring
complex and distributed ICS, with a particular focus on the demanding environment
of CERN.