CLS: A Fully Open Source Control System

The Canadian Light Source (CLS) is one of the first major accelerator facilities to adopt a fully open source control system. The control system is based on Experimental Physics and Industrial Control System (EPICS) in use at may other facilities. From the outset CLS utilised Real Time Embedded Multiprocessor System (RTEMS) and Linux as the underlying operating systems for real-time control computers, operator interface computers and servers. When communicating with PLC and other intelligent devices CLS has also adopted a policy of using open communications protocols where possible. Combined, these strategies have lead to a system that can easily evolve over the life of the facility without being tied to specific hardware or software suppliers. The operational experience over the past few years has indicated the selected architecture is sufficiently robust and reliable.