TRICONEX

1.Term Explanation

1. TRICONEX: Brand name, an industrial safety brand formerly under Invensys. It specializes in Tricon triple modular redundant (2oo3) fault-tolerant SIS Safety Instrumented Systems for high-risk process safety interlock control.
2. DO: Abbreviation of Digital Output, standard industrial automation term, referring to digital switching control signals sent out by controllers.
3. 3626X: Original factory hardware model code
   • Series 3600: General IO card series for Tricon systems
   • 26: Channel specification identifier
   • X: Enhanced revised hardware version with upgraded short-circuit protection, channel diagnosis, wide temperature adaptability and surge resistance.
4. Digital Output Module: Official component designation.

Supplementary Note: This card is a safety-rated output IO module fully compatible with Tricon triple redundant architecture and SIL3 safety integrity level. It is specially designed to output switching signals for interlock trip valves, solenoid valves, audible & visual alarms and shutoff valve drives.

2. Core Main Purposes

1. Output execution signals for safety interlocks (core function) It receives triple logic operation results from the Tricon main controller and outputs passive/active switching signals to field actuators, including emergency shutoff valves, emergency stop solenoid valves, burner cut-off devices, pump/fan emergency stop circuits. Reliable trip commands are sent out once process interlock conditions are triggered.
2. Drive equipment status alarm devices It outputs digital signals to control field audible & visual alarms, local warning lights and on-site alarm horns, triggering on-site safety alerts upon abnormal conditions such as overtemperature, overpressure, liquid level overflow and equipment faults.
3. Interlock run/stop permission signal exchange with third-party equipment It outputs run permission, interlock trip and process enable contact signals to boiler FSSS, compressor units, third-party PLCs and burner management systems to realize cross-equipment safety linkage.
4. 2-out-of-3 redundant safe output to prevent spurious or failed trips The module adopts triple independent internal circuits following Tricon 2oo3 voting logic. Single-channel damage, wire breakage or short circuit cannot cause false trips or loss of output, fully complying with SIL3 process safety standards.
5. Real-time channel-level fault diagnosis Built-in self-test circuits continuously detect channel wire breakage, load short circuit, loop leakage and abnormal power supply. All fault data is uploaded to the controller and generates Sequence of Events (SOE) records to facilitate maintenance.
6. Galvanic isolation and loop protection Each output channel features independent electrical isolation with automatic overcurrent and short-circuit protection. Short circuits on field wiring will not damage the Tricon main backplane, protecting the entire safety system from field-side faults.
7. Local & remote equipment control contact output It provides passive dry contact outputs for field control cabinets and local operation stations to remotely control valve switching, unit startup/shutdown and safety baffle movement.

3. Applicable Application Scenarios

Scenario 1: Petrochemical & Refining Units (Core Application)

SIS safety systems of oil refineries, ethylene plants, hydrogenation and catalytic reforming units. The DO 3626X outputs control signals for feed emergency shutoff valves, furnace fuel cut solenoid valves and circulating pump emergency stop interlocks to realize safe process cut-off under overpressure and explosion-risk conditions.

Scenario 2: Oil & Gas Stations, LNG Plants & Long-distance Oil/Gas Pipelines

Offshore oil platforms, onshore natural gas gathering stations, LNG liquefaction facilities and pipeline compressor stations. It controls automatic pipeline overpressure shutoff, wellhead safety block valves and interlock shutdown upon combustible gas leakage, suitable for explosion-proof and high-vibration outdoor cabinet environments.

Scenario 3: Coal Chemical, Ammonia & Methanol High-risk Processes

High-temperature and high-pressure sections of gasifiers, synthesis towers and ammonia synthesis plants. It drives oxygen cut-off valves and gasifying agent interlock shutoff equipment to prevent deflagration and overtemperature safety accidents.

Scenario 4: Furnace Safety Supervision System (FSSS) for Thermal Power & Waste Incineration Boilers

It provides safety contacts for boiler gas/oil cut-off valves, ignition interlocks and furnace purge permission loops to avoid furnace deflagration, meeting power plant safety specifications.

Scenario 5: Explosion-proof Reaction Workshops in Fine & Pharmaceutical Chemical Industry

Interlock systems for high-risk reactors involving oxidation, chlorination and nitration reactions. It automatically cuts off raw material feed, stops stirring and closes heating steam valves under abnormal working conditions.

Scenario 6: High-temperature & High-pressure Production Lines for Fertilizer, Rubber and Chemical Fiber

Safety interlocks for high-pressure reactors and steam pipe networks, outputting control signals for unit shutdown and pressure relief valve opening.

Scenario 7: Plant-wide Safety Linkage & Alarm Systems

Uniformly drives regional audible and visual safety alarm lights and explosion-proof alarm horns across the whole plant to realize visualized warnings of plant-wide safety abnormalities.

4. Supplementary Key Hardware Features

1. Safety Integrity Level: Compliant with IEC 61508 SIL3 and IEC 61511 process safety standards;
2. System Compatibility: Only compatible with racks of Tricon v9 / v10 triple redundant safety control systems;
3. Channel Configuration: Multiple independent isolated digital output channels with individual short-circuit protection;
4. Upgrades of X Version: Wider operating temperature range, enhanced EMC electromagnetic interference resistance and faster fault diagnosis response;
5. Safety Advantage: Triple-voted output eliminates safety spurious trips or interlock failures caused by single-point faults.

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