Safety Controllers

Safety control programs are downloaded to the logic solvers, which can only run applications developed in one of the 3 approved IEC 61131-3 programming languages. The logic solver monitors critical inputs and provides a safe response to any fault condition. The logic solver incorporates a rigorous redundancy model, manages safety approved peer-to peer communications with other safety controllers, and, with its open nature, interfaces to popular asset management software. A single logic solver provides a SIL 2 approved solution; a second redundant controller can be added for increased system availability.

Safety I/O Modules

The logic system interfaces to analog inputs with HART®, digital inputs and digital outputs. All modules have a 1oo1D safety architecture with run-time diagnostics. (1oo1D means 1 out of 1 voting with diagnostics, while 1oo2D would be a 1 out of 2 vote with diagnostics from redundant inputs.) Some field circuitry has a 1oo2D safety architecture to assure reliable failsafe operation.

Each channel of the analog input modules can acquire 4 dynamic variables and device status from each HART instrument, providing more process information to the control system from each device. The modules also support HART pass-through to popular asset management packages for device configuration, calibration and advanced diagnostics.