Invensys' Triconex Trident SIS is a SIL 3-certified, fail-safe, fault-tolerant controller for distributed use in hazardous facilities. It includes the OPC UA platform and fulfills requirements for emergency shutdown, fire and gas protection, burner management, high-integrity pressure protection and turbomachinery control. It's also TÜV-certified for SIL 3 applications in accordance with IEC 61508.