TRICONEX controller 3503E/3625/3720/3721/3009/4351B
product description
TRICONEX Safety Fault Tolerant Controller (SIS Triple Redundancy System under Schneider)
1、 Brand foundation
Triconex, formerly a safety instrument brand under Envision, now belongs to Schneider EcoStruxure Plant and is a global benchmark for industrial SIS (Safety Instrumented Systems). Its core technology is TMR triple module redundant architecture, all of which have passed the T Ü V SIL3 highest safety level certification and meet the IEC61508/IEC61511 process safety standards.
2、 Core TMR Triple Redundancy Principle (Different from Ordinary PLC/DCS)
The entire system consists of input modules CPU、 The output module has three independent parallel channels throughout the entire chain, and the internal high-speed TriBus bus synchronous operation:
Three independent CPUs (A/B/C) synchronously execute the same security logic program;
The digital signal adopts a two out of three voting method, and single channel faults are automatically blocked without affecting the output;
Simulate median filtering to remove abnormal drift sampling values;
Dual redundancy of power and communication modules;
Support module hot swappable online maintenance, replace faulty cards without stopping the machine, and uninterrupted interlock protection.
3、 Four mainstream controller product lines (selection differentiation)
1. Tricon (Classic Large Rack, v9/v10/v11）
Positioning: Integrated safety control for large equipment and units (ESD+gas turbine/compressor control+F&G)
Hardware: 19 inch multi slot rack, maximum expansion of 15 racks, 118 I/O modules, remote I/O up to 12km
Typical cards: 3008 main CPU, 3503DI, 3624AO, 3723 communication card, 3351 Modbus gateway
Applicable: Large scale refining LNG、 Anti surge of turbine/compressor in combined cycle power plant, offshore platform
Production stoppage explanation: The old models of v9/v10 are gradually being reduced in production, with stock maintenance and refurbished spare parts circulating
2. Tricon CX (new generation flagship v12, currently the main promotion)
Positioning: Integrated safety+unit control fusion platform, replacing the old Tricon model
Advantages: Significant improvement in CPU performance, SOE event accuracy of 1ms, remote expansion of 70km, 50% reduction in cabinet size, support for network information security authentication
Ability: Simultaneously achieve SIL3 safety interlocking, turbine speed regulation, anti surge, and coordinated control of the unit
Supporting software: Tricon Station 1131, built-in security logic automatic verification tool
Positioning: Small and medium-sized devices, distributed on-site safety cabinets, small boiler BMS, small compressors
Features: Integrated compact rack, fewer I/O points, lower cost, and complete TMR triple redundancy SIL3
Common modules: 3501DI, 3611AI, AIH3723X communication card, suitable for renovation projects and equipment installation
4. Tri GP (economical SIL2 universal safety controller)
Positioning: Low risk process, small fire and gas system, ordinary combustion management, only SIL2 certification, lower cost
Not suitable for high-risk scenarios such as ESD and turbine protection in large units
4、 Complete hardware composition (a standard Tricon system)
Triple redundant CPU main module (3 blocks per group, 3008/3009)
Running safety logic, voting operations, SOE event recording, and fault self diagnosis; SOE time accuracy ± 25ms (CX series 1ms)
Dual redundant power module
Two independent 24VDC inputs, backup for each other, automatic protection against short circuit/overvoltage
I/O signal module (full series triple channel)
DI digital input: 3503, 3504 (valve position, pressure switch, shut-off signal)
DO digital output: 3604, 3605 (emergency shut-off valve, trip relay)
AI analog input: 3700, 3701 (4-20mA pressure/temperature/speed transmitter)
AO analog output: 3624 (anti surge valve, speed control valve control)
HART communication card: intelligent transmitter diagnostic reading
Communication gateway module
3351 Modbus RTU/TCP, 3723 Profibus, OPC, GPS synchronous timing, docking with DCS (Honeywell ABB、 Yokogawa), upper HMI
Terminal base plate: equipped with front output terminals for each I/O card, isolating signals in explosion-proof areas
5、 Core functions
ESD emergency stop interlock: triggering unit safety shutdown due to overheating, overpressure, low oil pressure, and excessive shaft vibration
F&G Fire and Gas System: Flame, Combustible/Toxic Gas, Fire Probe Linkage Spray, Cut off Feed
BMS boiler combustion management: ignition, shutdown protection, fuel cut-off interlock
Turbine/compressor specific control: gas turbine/turbine overspeed protection, anti surge, load limiting (replacing Woodward and Bentley protection logic)
SOE accident sequence recording: Accurately record the sequence of faults, facilitating post accident analysis
Full channel hardware self diagnosis: real-time alarm for wire breakage, short circuit, and module failure, uploaded to DCS
Redundant communication: dual Ethernet/serial ports, single link disconnection without losing data
6、 Mainstream industry applications
Petrochemical/Refining: ESD equipment, compressor anti surge, LNG terminal, offshore platform
Thermal/Combined Cycle Power Plant: Steam/Gas Turbine Protection, Boiler BMS, Unit ETS Trip System
Coal chemical industry, long-distance oil and gas pipelines, pharmaceutical and fine chemical industry
Metallurgical blast furnace gas safety interlock, semiconductor special process safety protection
7、 Programming software: Tricon Station
Standard IEC61131-3: Ladder Diagram LD, Function Block FBD, Structured Text ST
Built in security logic verification, SIF security function verification, automatic document generation
Support online monitoring, program download, fault log export, simulation debugging
8、 Spare parts and shutdown status (2026)
The old Tricon v9/v10 CPU, 3008, 3503EN and other classic modules have been discontinued by the original factory, and there are no new futures available; The market source of goods includes inventory of new machines, dismantled machines, refurbished and repaired parts;
Tricon CX v12 and Trident are still in mass production, with priority given to new projects;
All discontinued modules are provided with long-term maintenance services by the original factory, which can repair faulty components.
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