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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Channels | 16 safe digital inputs |
| Input Voltage | 24 Vdc nominal (max 36 Vdc) |
| Input Current | 7 mA at 24 Vdc |
| Input HIGH | > 15 Vdc |
| Input LOW | < 9 Vdc (I < 2 mA) |
| Input Delay | Typically 10 ms |
| Power Requirements | 5 Vdc @ 8 mA; 24 Vdc int. @ 110 mA; 24 Vdc ext. @ 110 mA |
| 24 Vdc Out (field power) | Solid-state, short-circuit proof, max 450 mA |
| Max Load Capacitance (Out) | 32 μF |
| Voltage Drop (Out) | < 1.5 V at 450 mA |
| Safety Certification | TÜV SIL3 (IEC 61508) |
| Approvals | CE, TUV, UL, CSA, FM |
| Space Requirements | 4 TE, 3 HE (4 HP, 3U) |
| Key Coding | Module: A5/C5; Chassis: A5/C5 |
4. Product Introduction
The Honeywell FC-SDI-1624 is a 16-channel safe digital input module for the Safety Manager system. It monitors 24 Vdc discrete signals from field contacts, limit switches, and sensors in Safety Instrumented Systems, emergency shutdown, and fire & gas applications.
The module uses a fail-to-safe input stage so that any component failure results in a de-energized (safe) state to the processor. It includes a current-limited 24 Vdc output for powering field contacts, continuous self-diagnostics, and conformal coating on the FC version. The unit mounts in standard Safety Manager chassis with key-coded connectors.
FC-SDI-1624
FC-SDI-1624
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| All channels read LOW / module offline | Power missing or module not seated | ✅ High | Verify 5 V and 24 V present; reseat module and confirm key coding A5/C5 | Confirm power and connector engagement before replacement |
| Single channel stuck LOW or intermittent | Field wiring, contact, or FTA fault | ❌ Low | Measure voltage at module input terminals; check field contact and wiring continuity | Troubleshoot field device and wiring first |
| Channel mismatch fault (redundant signals) | Timing difference between dual contacts or filter setting | ✅ Medium | Compare A/B channel states in diagnostics; review filter/debounce settings | Adjust filter time or verify simultaneous contact closure |
| 24 Vdc Out overloaded or shorted | Field short or excessive load | ✅ High | Measure current on 24 Vdc Out; check for shorted field wiring | Clear short; module current-limits then recovers |
| Safety Manager reports diagnostic fault | Internal self-test failure | ✅ High | Review diagnostic buffer and self-test results in Safety Manager software | Module replacement typically required if hardware fault confirmed |
If diagnostics remain unclear, capture the diagnostic buffer, LED status, and photos of the module and field terminations, then contact technical support.
6. Frequently Asked Questions (FAQ)
Q: Does the FC-SDI-1624 require a specific Field Termination Assembly?
Yes. Most installations use a matching FTA (such as FC-TSDI-1624 or equivalent) for field wiring, isolation, and convenient termination. The module itself accepts direct 24 Vdc signals, but the FTA simplifies installation and provides the required interface.
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-SDI-1624 and FC-SDI-1624?
FS = non-conformal coated; FC = conformal coated (standard for the units commonly stocked). Functionally identical 16-channel 24 Vdc safe digital input modules. Confirm the exact revision required by your Safety Manager system.
Q: Can the 24 Vdc Out be used to power field contacts?
Yes. The module provides a short-circuit-proof, current-limited 24 Vdc solid-state output (max 450 mA) specifically for energizing field switching elements. Observe the 32 μF maximum load capacitance limit.
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 happens if a component fails inside the module?
The input stage is designed fail-to-safe. A component failure forces the input signal seen by the processor to the de-energized (safe) state in a normally energized system. Continuous self-tests detect internal faults within the configured diagnostic interval.
Q: What testing is performed before shipment?
Inbound visual and anti-counterfeit inspection, power-up on a genuine Safety Manager test rack, channel verification (HIGH/LOW thresholds), 24 Vdc Out load test, and generation of a test report. Photos and video of the functional test are available on request.
