Yokogawa ProSafe

Yokogawa ProSafe-PLC is a legacy programmable safety instrumented system used for emergency shutdown, process shutdown, and fire and gas applications. Its modular architecture combines a Critical Control Module with plug-in analog and discrete I/O, module buses, terminal assemblies, and communication interfaces. The controller reads field inputs, executes protective logic, and drives the required outputs independently of operator intervention. M-BUS or M-NET links connect the controller to ProSafe-COM for communication with supervisory systems, including CENTUM installations. The platform supports applications up to SIL 3, subject to the complete system configuration, and provides sequence-of-events recording for investigating trips and process disturbances. Its critical I/O families include discrete input/output, discrete output, analog input, and voltage input modules, with selection determined by the installed hardware and application.