TRICONEX 3721
Product Name
TRICONEX 3721 32-Channel Differential Analog Input Module; TMR Safety AI Card for 0–5 VDC/–5 to +5 VDC (TRICONEX by Schneider Electric Process Safety).
Product Description
The TRICONEX 3721 is a high-reliability, 32-channel differential analog input module engineered for TRICONEX TMR safety controllers. It is purpose-built to acquire DC-coupled voltage signals (0–5 VDC or –5 to +5 VDC) from field transmitters, sensors, and transducers in safety-critical applications, enabling precise monitoring and closed-loop safety interlocks/shutdowns.
Key features include programmable 12-bit/14-bit resolution for balancing precision vs. update speed, 10 ms full-channel update rate for deterministic signal capture, and continuous overvoltage protection (150 VDC/115 VAC) to safeguard against field-side transients. It leverages TMR backplane synchronization and majority voting to eliminate single points of failure, supports hot-swappable installation for online maintenance without SIS downtime, and provides built-in diagnostics for channel health and communication status.
Compliant with IEC 61508 SIL 3 and designed for TRICONEX TMR chassis integration, the 3721 ensures data integrity and fault tolerance in harsh industrial environments, making it ideal for retrofits or expansions of existing SIS where high-channel-density analog input and safety certification are mandatory.
Key Parameters & Specifications (Consolidated Table)
| Category | Specification | Notes |
|---|---|---|
| Manufacturer | TRICONEX (Schneider Electric Process Safety) | Safety-focused TMR SIS specialist |
| Product Type | 32-channel differential analog input module (AI) | TMR-compatible; DC-coupled |
| Primary Function | Voltage signal acquisition; TMR voting; diagnostics; overvoltage protection | For safety-critical SIS monitoring |
| Input Channels | 32 differential, DC-coupled | Isolated to prevent cross-channel interference |
| Input Voltage Ranges | 0–5 VDC or –5 to +5 VDC (programmable via TriStation) | Over-range measurement ±6% typical |
| Resolution | 12-bit or 14-bit (programmable) | Selectable via configuration software |
| Accuracy | < 0.15% of FSR (0 °C to 60 °C) | Temperature-compensated for stable performance |
| Update Rate | 10 ms (all channels) | Deterministic sampling for SIS timing |
| Common Mode Rejection (CMR) | ≥ 85 dB (DC to 100 Hz) | Minimizes noise from ground loops and EMI |
| Input Impedance | ≥ 10 MΩ (DC, powered); ~140 kΩ (power-off, typical) | Compatible with most industrial sensors/transmitters |
| Overvoltage Protection | 150 VDC/115 VAC continuous | Protects module from field-side transients |
| Power Supply | Backplane-powered by TRICONEX TMR chassis | No external power required; ~15 W max (logic power) |
| Compatibility | TRICONEX TMR safety controller chassis | Verify firmware version for full integration |
| Environmental Ratings | Operating Temp: 0 °C to 60 °C (rated); Storage Temp: –40 °C to +85 °C; Humidity: 5–95% RH (non-condensing); Vibration: Per IEC 60068-2-6 (5 g RMS, 5–500 Hz) | Install in climate-controlled cabinet (IP20) |
| Mechanical Specifications | Form Factor: TRICONEX standard chassis module; Mounting: TRICONEX TMR chassis slot; Protection Rating: IP20 (cabinet-mounted only); Hot-swappable: Yes | Supports online maintenance without SIS shutdown |
| Safety Certifications | IEC 61508 SIL 3; TÜV Rheinland certified; FM Approved; CSA Certified | Compliant with global SIS safety standards |
| Diagnostic Features | Channel open/short detection; overvoltage alerts; self-diagnostics; TMR voting status | Enables rapid fault troubleshooting and predictive maintenance |
Critical Installation & Operation Notes
- Channel Configuration: Use TriStation software to set input range (0–5 VDC/–5 to +5 VDC) and resolution (12-bit/14-bit) per channel group; mismatched ranges may cause signal clipping or measurement errors.
- Overvoltage Limits: Do not exceed 150 VDC/115 VAC continuous on inputs; transient suppressors may be required for high-voltage surge-prone environments.
- Wiring Best Practices: Use shielded twisted-pair cables for differential inputs; ground shields at the sensor/transmitter end to minimize EMI. Keep analog and power cables separated to avoid cross-talk.
- Hot-Swap Procedure: Follow TRICONEX safety guidelines for hot-swapping—ensure the module is properly aligned with the chassis slot to prevent backplane pin damage or SIS disruption.
- Firmware Compatibility: Match module firmware with TMR controller firmware to ensure reliable communication and correct diagnostic reporting.
Recommendations
- Installation: Insert the module into a designated analog input slot in the TRICONEX TMR chassis; wire differential inputs with shielded twisted-pair cables; verify isolation and ground connections before powering on.
- Commissioning: Use TriStation to configure ranges, resolution, and alarm limits; calibrate each channel with a precision vo