  Cyber Physical Systems solve complex problems through their tight integration
between the physical and computational components. Therefore, the reliability
of a complex system is the most critical requirement for the cyber physical
system because an unreliable system often leads to service disruption, property
dam-age, financial loses and sometimes lead to fatality. In order to develop
more reliable CPS, this paper proposes a generic framework for reliability
modeling and analysis for our ongoing work on cyber physical systems.This
paper, at first defines an architecture for general CPS which is comprised of
three layers; environment layer, communication layer, and computational layer.
Secondly, we formalize a reliability model for the architectural components,
and then propose a framework for the reliability of CPS with the consideration
of how to capture the reliability. Based on the research method, we demonstrate
the proposed frame-work with an illustrative example by using different
reliability values from offshore and onshore reliability data library. We
confirmed that the reliability model covers almost all possible reliabilities
required to general cyber-physical systems.
