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Frequently inquire Together
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InquiryTriconex 3351 Analog Input Module
The Triconex 3351 Analog Input Module, also cataloged as the 3351 analog input card, operates as a dedicated hardware component for 32-point current signal acquisition within Triconex safety instrumented systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3351 |
| Brand | Triconex |
| Origin | Not specified |
| Weight | ~1.5 kg |
| Dimensions | Full-height rack module |
| Operating Temp | Not specified |
| Power Consumption | 3 W maximum logic power |
| Channel Capacity | 32 points, commoned |
| Nominal Input | 4–20 mA DC |
| Operational Range | 2–22 mA DC |
| Max Field Voltage | 33 V DC |
| Max Reverse Voltage | -0.6 V DC |
| Max Input Current | 50 mA DC |
| Input Bandwidth | 16 Hz (-3 dB) |
| Source Impedance | 180 ohm |
| Input Impedance | 250 ohm (with backplane) |
| I/V Conversion | 100 ohm resistor, ±0.01% accuracy |
| Resolution | 12 bits |
| Absolute Error | 0.15% of full scale (20 mA) |
| Scan Time | <1 ms for all 32 points |
| Diagnostics | Force-to-value diagnostic (FVD) |
| Isolation | Functional-to-protective earth ≥500 V DC; functional-to-logic earth ≥800 V DC |
SIL3 Certification and Galvanic Isolation
The 3351 module is designed for integration into Triconex triple modular redundancy (TMR) architectures. It supports SIL3 certification requirements by ensuring deterministic fail-safe state execution. Galvanic isolation between functional and protective grounds prevents cross-channel interference, maintaining signal fidelity and compliance with safety standards.
Frequently Asked Questions (FAQ)
Q: Can the 3351 module be hot-swapped during system operation? A: No. Power must be removed from the rack before insertion or removal to avoid backplane disruption.
Q: How fast does the module scan all channels? A: All 32 points are synchronously scanned in less than 1 ms.
Q: What diagnostic capability is provided? A: The module supports force-to-value diagnostics, allowing verification of input channel behavior under controlled conditions.
Field Installation Guidelines
- Install the module in designated rack slots with full connector engagement.
- Ensure shielded cabling for 4–20 mA loops is grounded at a single point to avoid circulating currents.
- Route analog wiring separately from high-voltage conductors to minimize induced noise.
- Verify input excitation current and field voltage before energizing the module.
- Confirm environmental conditions meet specified operating and storage ranges.
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