TRICONEX 3624 – TMR 24 VDC Digital Input Module for Tricon Safety Systems

The TRICONEX 3624 is a triple-modular-redundant (TMR) digital input module designed for the Tricon safety-instrumented platform, typically used to bring in 24 VDC discrete signals from field devices into a SIL-rated SIS. From my experience, plants pick the 3624 when they need dependable, easily diagnosable input points that can be hot-swapped without shutting down the system. It seems to be a go-to spare for ESD, F&G, and BMS panels where uptime and proof-test simplicity really matter.

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Key Features

• TMR architecture – Three parallel input paths with voting improve fault tolerance in safety-critical loops.
• 24 VDC discrete inputs – Typically used for limit switches, pressure switches, solenoid feedback, and ESD contacts.
• Hot-swap replacement – Module can be replaced online in most cases, minimizing process disruption.
• Onboard diagnostics – Channel health and module status indication help maintenance teams pinpoint issues faster.
• System integration – Works within the Tricon backplane and is configured via TriStation 1131 engineering tools.
• Line monitoring options – In many cases used with field resistors for open/short detection on long cable runs.
• SIL environment ready – Suitable for use in IEC 61508 SIL3 applications when installed in a certified Tricon system.

Technical Specifications

Application Fields

You might notice that the 3624 fits best where deterministic, fail-safe digital inputs are required:

• Emergency Shutdown (ESD) and High Integrity Pressure Protection Systems (HIPPS)
• Fire & Gas (F&G) detection inputs and shutdown confirmation contacts
• Burner Management Systems (BMS) for boilers and furnaces
• Oil & Gas upstream separators, midstream pipelines, and downstream refining units
• Power generation balance-of-plant safety interlocks
• Chemical and pharma SIS loops where proof testing is routine

Advantages & Value

• Reliability – TMR input voting and continuous diagnostics reduce spurious trips and undetected failures.
• Compatibility – Drop-in fit for Tricon systems; engineered through familiar TriStation workflows.
• Maintenance efficiency – LEDs and status bits speed up loop checks; hot-swap capability shortens downtime.
• Cost control – As a common spare, it helps standardize inventory; fewer unique parts typically mean lower carrying costs.
• Lifecycle support – Strong ecosystem of documentation and field experience makes troubleshooting straightforward.

A maintenance supervisor recently told me they swapped a 3624 during a night shift in under ten minutes, verified inputs in TriStation, and avoided a unit shutdown. That’s the sort of practical value most teams care about.

Installation & Maintenance

• Cabinet & environment – Install in a Tricon chassis inside a clean, dry control cabinet with adequate ventilation; keep ambient within 0–60°C.
• Wiring – Use shielded pairs for long runs; follow site standards for dry/wet contact wiring and any required line-monitor resistors.
• Safety – Observe ESD protection; isolate field power before touching terminal bases; validate voting and trip logic after any change.
• Routine checks – Periodically proof-test inputs, clean connectors, and review diagnostic logs in TriStation 1131.
• Firmware/config – Keep project backups; apply vendor-recommended updates during scheduled maintenance windows.

Quality & Certifications

• CE and UL compliance typical for Triconex modules
• Triconex systems are certified to IEC 61508 for SIL3 when properly engineered and installed
• Manufacturing quality aligned with ISO-based processes
• Standard warranty: 12 months

Related / Supporting Components

For complete loop coverage, customers typically pair the 3624 with:

• TRICONEX 3008 main processor (Tricon controller)
• TRICONEX 3708E/3721 series I/O for complementary digital/analog needs
• Approved terminal bases and field termination assemblies for the Tricon chassis

If you have a specific signal list or need to confirm channel counts and line-monitor options for your exact 3624 build, send the part revision and we’ll match it against a tested install base. That small step typically saves time during FAT/SAT.