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- Model: FC-SDI-1624
- Brand: Honeywell
- Series: Safety Manager
- Core Function: Acquires 16 safety-related 24 VDC digital inputs
- Type: Safe Digital Input (SDI) Module
- Key Specs: 16 channels; 24 VDC nominal input; 36 VDC maximum input
- Construction: Conformal-coated FC version
- Certified Status: Listed in Honeywell Safety Manager TÜV revision records
Product Introduction
Sixteen 24 VDC input channels are the defining feature of the HONEYWELL FC-SDI-1624. It is a Safety Manager Safe Digital Input (SDI) module intended to acquire discrete field signals such as switches, contacts, trips, and status devices in safety-related control architectures. Honeywell’s hardware reference identifies the FC prefix as the conformal-coated version, while TÜV records list FC-SDI-1624 as a 16-channel, 24 VDC safe digital input module.
The electrical details matter during replacement. Published Safety Manager data specifies a maximum input voltage of 36 VDC, a typical input delay of about 10 ms, and 24 VDC solid-state outputs associated with the module architecture, with short-circuit protection and a maximum stated current of 450 mA. Well, technically, the exact certified behavior depends on the complete Safety Manager configuration, so the module should not be treated like a conventional PLC DI card.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | FC-SDI-1624 |
| Manufacturer | Honeywell |
| Product Family | Safety Manager |
| Product Type | Safe Digital Input Module |
| Input Channels | 16 |
| Nominal Input Voltage | 24 VDC |
| Maximum Input Voltage | 36 VDC |
| Input Current | Approx. 7 mA at 24 VDC |
| Input HIGH | >15 VDC |
| Input LOW | <9 VDC, I <2 mA |
| Typical Input Delay | Approx. 10 ms |
| Internal Supply | 5 VDC |
| Internal 24 VDC Supply | Approx. 110 mA |
| External 24 VDC Input Current | Approx. 110 mA |
| Solid-State Output | 24 VDC, short-circuit protected |
| Maximum Output Current | 450 mA |
| Module Size | 4 TE × 3 HE |
| Coating | Conformal coated |
| Safety Documentation | TÜV-certified Safety Manager configuration |
| Typical Application | Safety instrumented system digital input acquisition |
Honeywell’s hardware reference and supporting technical data identify these electrical characteristics and distinguish the FC conformal-coated version from the non-coated FS-SDI-1624.
HONEYWELL FC-SDI-1624
Key Features and Practical Value
- 16 safety digital input channels in one compact module.
- Designed for 24 VDC field signals.
- Input threshold information supports predictable ON/OFF detection.
- Approximate 10 ms input delay suits many discrete safety signals.
- Conformal coating provides the environmental distinction of the FC version.
- Solid-state, short-circuit-protected output circuitry is part of the documented module design.
- Compact 4 TE × 3 HE form factor suits Safety Manager rack installation.
- The module is specifically listed in Honeywell Safety Manager functional-safety documentation.
The FC prefix is worth checking. In Honeywell terminology, FC means conformal coated, while FS identifies the non-conformal-coated version.
Typical Applications
The module is intended for safety-related discrete signal acquisition in environments such as:
- Emergency shutdown systems (ESD)
- Burner management systems
- Machinery trip circuits
- Process interlocks
- Fire and gas interfaces
- Valve and actuator status monitoring
- Oil and gas process units
- Chemical and power-generation facilities
For a plant maintenance engineer, the important point is architecture. A 16-channel 24 VDC PLC input card may have the same headline numbers but still be unsuitable for a Safety Manager safety function.
Related Models
FS-SDI-1624 — Non-conformal-coated version of the same 16-channel, 24 VDC Safe Digital Input module. Honeywell’s TÜV documentation lists it separately from the FC version.
FC-SAI-0410 — Conformal-coated Safe Analog Input module with 4 channels, intended for safety-related analog measurement rather than discrete input acquisition.
FC-SAI-1620m — Conformal-coated high-density Safe Analog Input module with 16 channels for higher-density analog safety applications.
FC-PSU-240516 — Conformal-coated 24 VDC/5 VDC Safety Manager power supply rated at 16 A in the Honeywell TÜV listing.
Installation and Maintenance
Before replacement, record the complete type number, version, chassis slot, field wiring, input allocation, and Safety Manager configuration. Take a photo of the existing module and terminal arrangement.
Check the field voltage first. A signal that looks like “24 VDC” on paper can still exceed the allowed input range during switching transients or supply faults; the documented maximum input voltage is 36 VDC.
After installation, verify module diagnostics and representative input channels. Test actual field states against the approved cause-and-effect documentation. For an SIS (Safety Instrumented System), commissioning should follow the site’s functional-safety validation and proof-test procedure.
Quality Inspection and Test Procedure
1. Inbound inspection
- Verify part number and available revision.
- Confirm the conformal-coated FC version.
- Check serial number and nameplate.
- Inspect connectors, housing, coating, and PCB exposure.
- Look for corrosion, impact damage, overheating, or previous repair evidence.
2. Live Test
Use a compatible Honeywell Safety Manager test environment.
- Power-up and self-diagnostic check
- Verify all available digital input channels
- Simulate representative 24 VDC field signals
- Confirm input threshold behavior
- Check module status and controller communication
- Run an extended powered test where practical
- Generate a Test Report
3. Electrical Testing
Verify supply, grounding, continuity, and applicable insulation characteristics according to the Honeywell procedure. Do not apply an arbitrary hipot voltage to safety electronics without manufacturer approval.
4. Firmware and Configuration Verification
Record accessible hardware and firmware information. Preserve the original module version and field configuration records.
5. Final QC
After QC sign-off, use antistatic protection, cushioning, and rigid outer packaging. Attach a dated QC label. Test photos or video can be provided with the shipment documentation.
Technical Replacement Pitfalls
FC vs. FS mismatch: FC-SDI-1624 is conformal coated; FS-SDI-1624 is not. Do not treat the coating designation as cosmetic when the installed environment requires the specified product variant.
Wrong input voltage: The nominal value is 24 VDC, but the published maximum is 36 VDC. Verify the field supply and transient behavior before commissioning.
Input threshold error: Signals below 9 VDC are specified as LOW, while HIGH requires more than 15 VDC. A weak field contact or bad supply can therefore produce an ambiguous-looking diagnostic condition.
Firmware or hardware revision mismatch: Record the installed version before ordering. Safety Manager revisions are separately identified in Honeywell’s hardware documentation and certification records.
ESD handling: Use a grounded antistatic wrist strap and ESD-safe work surface. Safety I/O modules should not be handled by exposed circuitry.
Procurement Guidance
For international MRO procurement, specify Honeywell FC-SDI-1624 together with the exact revision, condition, conformal-coating status, test status, warranty, country of origin, lead time, and Incoterms.
Honeywell’s TÜV revision list identifies FC-SDI-1624 with part number 3432100, CC V1.0, and also lists 3432110, CC V1.1 under the same catalog number. That makes the hardware revision particularly important when purchasing a replacement.
For customs paperwork, a functional description such as “industrial safety-system 16-channel digital input module” is clearer than “electronic board.” Final HS classification should be confirmed against the actual shipment and destination-country rules.
Quick Conclusion
- FC-SDI-1624 is a Honeywell Safety Manager 16-channel Safe Digital Input module.
- The nominal field input is 24 VDC, with a published maximum of 36 VDC.
- The FC prefix identifies the conformal-coated version, distinguishing it from FS-SDI-1624.
- Honeywell/TÜV records identify multiple certified hardware revisions, including CC V1.0 and CC V1.1.
- For replacement purchasing, match the full revision, coating variant, field wiring, and Safety Manager configuration, not just the 16-channel count.
