TRICONEX AI3351S2 High-density Analog Input Module

TRICONEX AI3351S2 High-density Analog Input Module
I. Product Brief Description
Innovatek Congjisen Triconex Tricon SIS Safety Instrumentation System – Specialized 32-channel Analog Input Card, S2 represents the second-generation optimized hardware version; equipped with TMR three-mode redundant 2oo3 voting safety architecture, specifically designed for collecting 4-20mA process analog signals in critical safety circuits of oil, chemical, and power plants. It converts on-site pressure, temperature, level, and flow signals into digital quantities and uploads them to the safety controller, meeting IEC61508 SIL3 functional safety level. It is the core I/O acquisition unit of the emergency stop system (ESD), with rack plug-in installation and supports hot-swappable maintenance during system operation.

 Key Technical Parameters Table
Parameter Item Technical Indicators
Channel Configuration 32-channel common-wire analog input channels
Standard Input Signals 4-20mA DC (mainstream); compatible with 0-20mA, 0-10V DC voltage signals
Effective Measurement Range Current: 2-22mA DC; Voltage: 0-10V DC
A/D Conversion Resolution 12bit, 0.01% full-scale step
Measurement Accuracy Typical ±0.1% FS (full-scale)
Loop Resistance Current loop ≤ 180Ω; Voltage loop ≥ 1MΩ
Total Channel Scanning Cycle < 1ms (all 32 channels complete acquisition)
Signal Bandwidth 16Hz
Power Supply Backplane DC24V power supply
Overall Power Consumption ≤ 20W
Safety Architecture Three-mode redundant TMR three-out-of-two hardware voting
Safety Certification SIL3 (TÜV Rheinland certification)
Self-Diagnosis Coverage Open circuit, short circuit, overvoltage, overcurrent, signal drift, internal circuit fault
Panel Status Indicator Lights PASS operation, FAULT fault, ACTIVE working, FIELD PWR on-site power four-channel LED
Operating Environment Temperature -20℃ ~ +70℃
Storage Temperature -40℃ ~ +85℃
Humidity 5%~95% RH, no condensation
Shaking and Impact Resistance 5g (10~2000Hz) vibration; 50g short-term impact
Protection Grade IP20 (inside control cabinet)
Overall Machine Weight Approximately 1.5kg
Installation Method Tricon host rack slot plug-and-play installation, supports hot-swappable without downtime

 Core Product Performance
Three-mode Redundant Fault-Tolerant Safety Design
Three independent acquisition circuits inside the module sample signals synchronously, the controller performs three-out-of-two comparison and calculation; single path acquisition branch hardware damage, signal interference errors, the system automatically eliminates abnormal data, which will not trigger stop prematurely, nor will the protection fail to meet the strict requirements of high-risk process safety.
High-density Integration, Saving Cabinet Space
Single card 32-channel large-capacity acquisition, compared with 8-channel module, significantly reduces rack occupation, the preferred choice for large-scale refining and chemical, power plant measurement points dense scenarios.
Full Channel Real-time Fault Self-Diagnosis
Continuous inspection of each sensor break, loop short circuit, power abnormality, fault location is accurately uploaded to the upper-level monitoring screen, facilitating rapid maintenance and troubleshooting.
Industrial Strong Anti-interference Capability
Channel and backplane bus electrical isolation, circuit board three-proof coating, withstands plant dust, salt fog, large-power equipment electromagnetic interference, can operate 7×24 hours continuously.
Online Hot Swap Maintenance
The entire SIS system does not require downtime, can directly plug and replace faulty modules, shortening production shutdown and maintenance time.
Software Compatibility and Adaptation
Complementary TriStation 1131 configuration software programming and debugging, can seamlessly connect with Tricon V9/V10 full series hosts, data can be bidirectionally uploaded to the entire plant DCS system.

Application Domains
Petroleum refining, natural gas station ESD emergency shutdown system process parameter acquisition;
Thermal power, gas power station boiler FSSS furnace safety monitoring, turbine bypass safety interlock signal monitoring;
Chemical reaction vessel, hydrogenation device, storage tank area liquid level pressure safety instrument system;
Oil and gas long-distance pipeline compressor station, LNG receiving station safety control system;
Coal chemical, pharmaceutical high-risk production workshop SIS safety interlock measurement point acquisition;
Old Triconex SIS system spare parts replacement and maintenance scenarios.

List of Main I/O Modules of the Same Series of Triconex
Analog Input AI Series AI3351S2: 32-channel 4-20mA high-density AI module (this model, S2 optimized firmware version)
AI3351S1: Initial basic version, with simplified hardware diagnostic function
AI2351: 8-channel standard analog input module, suitable for small measurement point circuits