This 32-channel differential DC-coupled Analog Input (AI) module is designed for the Triconex Tricon Triple Modular Redundant (TMR) Safety Instrumented System. It provides high-precision analog signal acquisition with full channel isolation, programmable resolution, and SIL 3–capable fault-tolerant architecture.

The module is optimized for critical process monitoring and safety interlock applications in high-risk industrial environments.

1. Input Characteristics
Channel Configuration

Number of Channels: 32 differential DC-coupled inputs

Isolation:

Full isolation between channels (1500 VDC)

Field side to system side isolation

Supported Input Types

Voltage Inputs:

0–5 VDC (unipolar)

−5 to +5 VDC (bipolar)

Input impedance: ≥ 10 MΩ

Current Inputs:

0–20 mA

Requires external 250 Ω precision shunt resistor

Measurement Performance

Resolution: 12-bit / 14-bit (programmable)

Accuracy: < 0.15% FSR (0 °C to 60 °C)

Update Rate: 10 ms (all channels scanned)

Response Time: < 1 ms

Signal Integrity & Protection

Common Mode Rejection Ratio (CMRR):

−85 dB (DC to 100 Hz)

Common Mode Voltage Range:

−12 V to +12 V (peak)

Over-Range Protection:

150 VDC / 115 VAC continuous

2. Architecture & Reliability

Redundancy Architecture:

Triple Modular Redundancy (TMR)

2-out-of-3 (2oo3) voting mechanism

No single point of failure

Hot Swap Capability:

Supported

Online replacement without process interruption

Diagnostics & Status Indication:

Module indicators: PASS / FAULT / ACTIVE / FIELD

Independent per-channel diagnostics

Continuous signal integrity monitoring

This architecture ensures deterministic data acquisition suitable for SIL 3 safety applications.

3. Electrical & Mechanical Specifications

Power Supply: 24 VDC

Power Consumption: < 15 W

Operating Temperature: −40 °C to +70 °C

Installation: Standard Tricon rack mounting

Weight: Approx. 2.06 kg

4. Typical Application Scenarios
Rotating Equipment Safety Protection

Shaft vibration monitoring

Shaft displacement measurement

Speed detection

Bearing and process temperature acquisition

Long-Distance Pipelines & Offshore Platforms

Pressure monitoring

Flow measurement

Tank level detection

High EMI resistance environments

Chemical & Refining Plants

Reactor critical parameter acquisition

Storage tank safety monitoring

Heating furnace process control

ESD & Safety Interlock Systems

High-reliability analog signal input

SIL 3 compliant signal processing

Critical process variable monitoring

TRICONEX 3721｜Analog Input Module｜