The old relay and L.E.D. system has been replaced with a hybrid system that mixes software and relay logic to provide core safety functions along with additional software control, protection and monitoring. The new system preserves redundant relay chains as the underlying logic for the system while allowing additional software protections and flexibility. Replacing L.E.D. status indicators and mechanical switches with a touch screen interface allows for at-a-glance system overview and control, while being easy to add new features as the system grows.
The A-cave control system also uses a programmable logic controller (PLC) in conjunction with a touch panel operator interface to control components along the beamline such as turbo pumps and vacuum gate valves. The advantage of using a PLC is that control and interlocking can be combined into a flexible and easily maintained system. This flexibility allows for faster implementation of new features, easier interactions for operators, and enhanced automation of routine processes. The PLC can also be integrated into EPICS, which allows for enhanced monitoring capabilities and diagnostics for operations staff.