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Triple Modular Redundant (TMR) 24 VDC analog input module belonging to the Trusted T8000 Series. Developed for SIL3 high-safety industrial applications, it performs high-precision acquisition and fault-tolerant transmission of critical analog signals including 4–20 mA, 0–10 V and thermocouple inputs.
Designed with a 2-out-of-3 (2oo3) hardware voting scheme and channel-level triple redundancy architecture, every single channel incorporates three independent signal paths. Equipped with 2500 V isolation and comprehensive diagnostic functions, the module maintains bumpless operation upon single-path failure. It is extensively deployed as core I/O hardware for Safety Instrumented Systems (SIS), Emergency Shutdown (ESD) and critical process control across high-risk industries such as petrochemical, chemical, power generation and nuclear power.
DOCUMENT DOWNLOAD
ICS Triplex T8431C.pdf
Product Specifications
1. Core Technical Parameters
Model: T8431C (Trusted T8000 Series)
Channels: 40 independent triple-redundant channels (120 physical signal paths)
Input Types: 4–20 mA (0–22 mA), 0–10 V (0–6 V), Type J thermocouple
Accuracy: ±0.02% FS for current & voltage; ±0.1% FS for thermocouple
Resolution: 16-bit (3.9 μA / 0.15 mV)
Sampling & Update Rate: 100 Hz per channel; 0.5 ms global refresh
Isolation: 2500 VDC (channel-to-channel / channel-to-backplane)
Power Supply: 20–32 VDC (typical: 300 mA; max 450 mA @24 VDC)
Dimensions: 266×31×303 mm; Weight: 1.2 kg
Certifications: CE, UL, TÜV, IEC 61508 SIL3, ISO 9001
2. Functional Features
TMR Hardware Voting: Three parallel acquisition paths with 2oo3 voting output for bumpless operation under single-point fault.
Channel-wise Isolation: Independent 2500 V isolation per channel to prevent fault propagation across channels.
Programmable Digital Filter: Configurable digital filtering suppresses high-frequency noise for stable output.
Event Logging: 1 ms event resolution with ±0.5 ms timestamp accuracy to facilitate fault tracing.
Redundancy Synchronization: Real-time synchronization among three channels plus data consistency check with automatic fault alert upon anomaly.
Application Scenarios
Oil & Gas: Fire & Gas (F&G) monitoring on offshore platforms, drilling parameter acquisition, pipeline pressure and temperature supervision, as well as ESD emergency shutdown systems.
Chemical & Petrochemical Industries: Reactor temperature and pressure monitoring, interlock protection, compressor anti-surge control and toxic & hazardous gas detection.
Power Industry (Thermal & Nuclear Power): Furnace draft pressure, steam temperature/pressure measurement, critical parameter collection for nuclear reactors and safety interlock systems.
Metallurgy: Blast furnace temperature and pressure, molten steel level, rolling process parameter monitoring and safety shutdown control.
Pharmaceutical & Water Treatment: Cleanroom temperature and humidity, purified water indexes, wastewater process monitoring and compliance-focused data logging.
Rail Transit & Marine Vessel: Power system parameters, marine propulsion equipment monitoring and safety instrumented systems.
Comparison of Peer SIL3 TMR Analog Input Modules
| Item | T8431C | 3503E | F3330 |
|---|
| Redundancy | TMR,2oo3 voting | TMR,2oo3 voting | TMR,2oo3 voting |
| Channels | 40(120 paths) | 32(96 paths) | 32(96 paths) |
| Accuracy | ±0.02%FS | ±0.05%FS | ±0.03%FS |
| Resolution | 16bit(3.9μA) | 15bit | 16bit |
| Update | 0.5ms | 1ms | 1ms |
| Isolation | 2500VDC | 1500VDC | 2000VDC |
| Hot-swap | Yes | Yes | Yes |
| Cert | SIL3/CE/UL/TÜV | SIL3/CE/UL | SIL3/CE/TÜV |
| Price | Mid-high | High | Mid-high |
| Advantage | More channels,high precision&isolation,fast refresh | Well-known brand | Stable,fits HIMA |
FAQ
Q1: What SIL level does T8431C have? Is it applicable for SIL3 systems?A: T8431C is certified to IEC 61508 SIL3. It can be directly deployed in SIL3-rated Safety Instrumented Systems (SIS) and ESD emergency shutdown systems to satisfy safety integrity requirements for high-risk industries.
Q2: What input signals are supported? Is hardware modification required?A: Compatible with 4‑20mA (max.22mA), 0‑10V (max.6V) and Type J thermocouple. Signal type switching is completed via software configuration without hardware modification or module replacement.
Q3: Will system shutdown occur upon single-channel failure?A: No. Adopting TMR triple modular redundancy with three independent acquisition paths per channel and hardware 2oo3 voting logic. The system automatically switches to healthy paths to maintain bumpless operation under single path/channel fault; faulty modules can be replaced online.
Q4: How about accuracy and long-term stability? Is periodic calibration needed?A: Accuracy: ±0.02%FS for current/voltage inputs, ±0.1%FS for thermocouple with 16-bit resolution and outstanding long-term stability. Calibration every two years is recommended with achievable calibrated accuracy of ±0.03% to sustain measurement precision.
Q5: What is the isolation rating and anti-interference performance?A: 2500 VDC isolation between channel-to-channel and channel-to-backplane; CMRR ranges from -40 to -60 dB and withstands ±250 VDC common-mode voltage to suppress severe field EMI and ensure stable signal acquisition.
Q6: Does it support hot-swap? Is system shutdown required during replacement?A: Hot-swap is available. Redundant channels take over automatically during online module replacement without plant shutdown, cutting maintenance cost and outage risk.
Q7: Operating temperature range and applicable environments?A: Operating temperature: 0℃~+60℃; Humidity: 10%~95% RH non-condensing. Suitable for harsh environments including industrial control cabinets and outdoor explosion-proof enclosures for high-temperature, high-humidity and high-interference sites such as oil, chemical and power plants.
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