TRICONEX 3674 – TMR Safety I/O Module for High-Integrity Tricon Systems

The TRICONEX 3674 is commonly installed in Emergency Shutdown (ESD), Burner Management Systems (BMS), Fire & Gas, and turbomachinery protection where TMR logic and diagnostic coverage are preferred. You might notice that this card family is chosen when downtime is costly and proof testing has to be planned around live running.

• Oil & Gas (upstream, midstream, downstream) – trip logic, cause & effect interlocks, compressor ESD.

• Petrochemical & Chemical – reactor safeguarding, SIS interlocks, F&G interfaces.

• Power Generation – boiler BMS, steam turbine protection, balance-of-plant safety loops.

• Refining & LNG – process shutdown and permissive controls with high availability.

• Pharma & Specialty – safety loops where validated uptime is critical.

• Reliability that reduces trips – TMR voting and self-testing minimize spurious shutdowns, which typically translates into measurable production savings.

• Compatibility with installed base – Fits existing Tricon racks and engineering workflows; no surprise retraining or cabinet changes.

• Serviceability – Hot swap capability and clear diagnostics shorten mean time to repair.

• Lifecycle support – Long-term availability and a mature toolchain (TriStation 1131) simplify change control and audits.

A maintenance lead at a gas compression site told us they swapped a 3674 card during a planned partial proof test—no process upset, just a clean diagnostic clear and back in service. That’s usually the kind of low-drama maintenance teams are after.

• Panel environment – Use a clean, ventilated cabinet with proper bonding/earthing; maintain ambient within the rated temperature (typically 0–60 °C).

• Wiring – Route field wiring to the appropriate Tricon field termination assemblies (FTAs); segregate low-level and high-energy wiring to reduce interference.

• Hot swap procedure – Place the module in/out per system maintenance instructions; verify LED status and controller diagnostics prior to returning the loop to service.

• Routine care – Periodic visual inspection, dust removal with dry air, connector checks; schedule proof testing per SIL calculations.

• Firmware/config management – Keep module firmware (if applicable) and TriStation projects under version control; apply updates only after MOC and validation.

• Designed for use in IEC 61508 SIL3-certified Tricon safety systems (TÜV assessed platform).

• Typical industrial approvals include CE and UL; specific markings depend on module revision.

• Manufacturer’s warranty applies per Triconex/Schneider Electric policy for SIS components.

• Tricon main chassis and backplane (for card slotting and TMR communications).

• Tricon power supply modules (backplane logic power).

• Field Termination Assemblies (FTAs) and system cables matched to the 3674 signal type.

• TriStation 1131 engineering software for configuration, diagnostics, and maintenance.

If you’re matching a specific 3674 revision to a signal type or existing FTA, share the current card part/revision and cabinet layout—we can verify compatibility before shipment. You might avoid a lot of last-minute rewiring that way.