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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Channels | 16 safe analog inputs |
| Input Range | 0 to 4.1 V (supports 0–20 mA / 4–20 mA via FTA) |
| A/D Converter | 12-bit, ±1 LSB inaccuracy |
| Module Inaccuracy | < 0.25% full scale |
| Input Resistance | > 1 MΩ |
| Power Requirements | 5 Vdc @ 35 mA + 24 Vdc @ 35 mA |
| Absolute Max Input | ±36 Vdc |
| Crosstalk | > 60 dB |
| Safety Certification | TÜV SIL3 (IEC 61508) |
| Approvals | CE, TUV, UL, CSA, FM |
| Space Requirements | 4 TE, 3 HE (4 HP, 3U) |
| Operating Temperature | 0 °C to +60 °C |
| Weight | Approx. 0.14–0.20 kg |
4. Product Introduction
The Honeywell FC-SAI-1620M is a 16-channel safe high-density analog input module for the Safety Manager system. It acquires 0–4.1 V signals (typically converted from 4–20 mA field transmitters via an FTA such as FC-TSAI-1620M) for Safety Instrumented Systems, emergency shutdown, and critical process monitoring.
It delivers 12-bit conversion with module inaccuracy under 0.25% full scale, channel-to-channel crosstalk greater than 60 dB, and continuous self-diagnostics. The module is TÜV SIL3 certified and designed for direct installation in Safety Manager chassis with key-coded connectors.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No channel readings / all channels offline | Module not seated or power missing | ✅ High | Verify 5 V and 24 V present at chassis; reseat module and check key coding (A5/C25) | Confirm power and connector engagement before replacement |
| Single channel reads open or out of range | Field wiring, FTA, or transmitter fault | ❌ Low | Measure 0–4.1 V at module input pins; check FTA 250 Ω resistors and loop power | Troubleshoot field side and FTA first |
| Multiple channels show crosstalk or noise | Grounding issue or excessive load capacitance | ✅ Medium | Verify analog 0 V isolation; measure load capacitance < 100 nF | Correct field grounding and capacitance before swapping module |
| Safety Manager reports module diagnostic fault | Internal A/D, supply, or self-test failure | ✅ High | Review diagnostic buffer and self-test results in Safety Manager software | Module replacement typically required if diagnostics confirm hardware fault |
| Module rejected on insertion | Key coding mismatch or wrong chassis slot | ✅ High | Confirm module holes A5/C25 match chassis pins | Use correct coded chassis position only |
If diagnostics remain unclear, capture the diagnostic buffer, LED status, and photos of the module and FTA, then contact technical support.
FC-SAI-1620M
FC-SAI-1620M
6. Frequently Asked Questions (FAQ)
Q: Does the FC-SAI-1620M require a specific Field Termination Assembly?
Yes. The module itself accepts 0–4.1 V. For standard 0–20 mA or 4–20 mA transmitters you need a matching FTA such as FC-TSAI-1620M (or TSHART-1620m / TSGAS-1624 depending on application). The FTA provides the precision 250 Ω conversion resistors and loop power options.
Q: Is this module hot-swappable?
No. Power down the Safety Manager chassis before removing or inserting the module. Hot-swapping risks backplane damage and can trigger system faults.
Q: What is the difference between FS-SAI-1620m, FC-SAI-1620M, and FA versions?
FS = non-conformal coated, FC = conformal coated (typical for the “M” suffix units), FA = another coating/revision variant. Functionally they are the same 16-channel SIL3 analog input module; confirm the exact revision required by your Safety Manager system.
Q: Can I use this module with Experion PKS C300 controllers?
It is designed for the Safety Manager platform. While Safety Manager integrates with Experion PKS, the FC-SAI-1620M is not a standard C300 Series A or Series C I/O module. Verify chassis and controller compatibility before ordering.
Q: Why is new surplus pricing lower than current Honeywell list price?
These are genuine OEM modules that were surplus to project requirements or excess factory stock. They are unused, original, and fully functional. They carry a 1-year warranty from the seller and are tested prior to shipment.
Q: What firmware or configuration is required when replacing a failed unit?
The module itself has no user-loadable firmware. Configuration and safety logic reside in the Safety Manager controller. After physical replacement, the controller will run its self-tests. Mirror any external voltage read-back wiring and confirm FTA connections match the original installation.
Q: What testing is performed before shipment?
Inbound visual and anti-counterfeit inspection, power-up on a genuine Safety Manager test rack, channel verification across the full 0–4.1 V range, crosstalk checks, and generation of a test report. Photos and video of the functional test are available on request.
