TRICONEX 3624 – TMR Discrete I/O Module for Safety-Critical Control

You’ll see the 3624 in safety instrumented functions where discrete control matters: emergency shutdowns, trip logic, permissives, and hardwired interlocks. From my experience, it’s chosen when teams want consistent behavior across units and a tidy maintenance story.

• Oil & Gas (ESD, HIPPS, compressor protection)

• Refining & Petrochemicals (BMS, unit interlocks, flare systems)

• Power Generation (turbine protection, auxiliary trips)

• Chemicals & Fertilizers (reactor trips, feed shutdown)

• Pipeline & Terminals (pump permissives, emergency stops)

• Reliability that shows up in the data – TMR plus diagnostics delivers high availability; fewer nuisance trips in most cases.

• Lifecycle stability – Long supported lifecycle and spare-part continuity ease planning for turnarounds.

• Interoperability – Designed specifically for Tricon systems, so firmware, tools, and TAs line up cleanly.

• Serviceability – Hot-swap replacement and clear LEDs shorten MTTR; technicians appreciate the straightforward handling.

• Total cost perspective – Reduces unexpected trips and overtime callouts, which often matters more than the initial card price.

You might notice that teams standardize on the 3624 for unit retrofits because the channel behavior is predictable, and proof-test routines are easy to document. One maintenance lead at a Gulf Coast refinery put it simply: “We swap it, mark the proof-test, trend the diagnostics, and move on. No surprises.”

• Cabinet & environment – Install in a certified Tricon chassis within a clean, ventilated enclosure; maintain ambient within the specified temperature and humidity range.

• Wiring – Land field wiring on the matching termination assembly; use proper polarity for 24 VDC circuits and observe channel isolation guidelines.

• Grounding & shielding – Bond shields at the recommended point to minimize noise; keep high-voltage and signal wiring separated.

• Hot-swap handling – Follow site MOC and system procedures; confirm the module is healthy via LEDs/diagnostics after insertion.

• Routine maintenance – Schedule proof tests per the SIF’s SIL target; inspect terminals for looseness, clean dust, and load recommended firmware revisions during planned outages.

• Spare strategy – Keep at least one spare 3624 per critical unit; store in anti-static packaging and track firmware compatibility.

• Part of a TüV-certified Tricon SIS platform for up to SIL3 applications (per IEC 61508 / IEC 61511 when applied correctly)

• CE compliant; typically UL/CSA recognized for industrial control equipment

• Manufactured under ISO 9001 quality systems

• RoHS conformity for restricted substances (varies by production lot; verify on request)

• Standard manufacturer warranty applies to new modules; extended service options usually available

If you’re matching an installed base, send the exact 3624 part revision and termination assembly part number. It seems minor, but in many cases that’s what ensures the channel behavior and diagnostics line up exactly with your site standards.