HONEYWELL FC-SDI-1624 – 16‑Channel 24 VDC Sinking Digital Input Module for Industrial PLC/SCADA I/O

The HONEYWELL FC-SDI-1624 is a 16‑channel, 24 VDC sinking digital input module designed for Honeywell’s Series C/Experion platforms. It’s typically used to bring in discrete field signals from proximity sensors, limit switches, and dry contacts, consolidating them into a clean, manageable I/O point count.    From my experience, it slots in smoothly where you need reliable 24 V logic inputs, quick status diagnostics, and a neat termination layout that keeps panel wiring tidy.

• 16 digital inputs, 24 VDC (sinking)      – Ideal for PNP sensors, pushbuttons, interlocks, and equipment permissives at standard 24 VDC control levels.

• Grouped commons for clean wiring      – Inputs are typically organized in groups to simplify field power distribution and troubleshooting.

• Per‑channel status LEDs      – Quick visual checks during commissioning and maintenance; you can spot a miswired sensor in seconds.

• Noise‑robust input filtering      – Debounce/filtering typically reduces nuisance transitions from contact bounce and electrical noise on long cable runs.

• Series C form factor and backplane power      – Integrates with the Honeywell I/O base/termination assembly (IOTA) and communicates via the platform backplane to the controller.

• Clear labeling and serviceability      – Wire markers, channel IDs, and accessible terminals support fast, low‑risk field changes.

• Compatible with Experion/C300 architectures      – Works within Honeywell’s distributed control ecosystem; no extra conversion hardware in normal cases.

• Factory automation: packaging lines, conveyors, palletizers (limit switches, photoeyes, guard doors)

• Process skids: compressors, pumps, dosing systems (start/stop, permissives, alarms)

• Utilities and facilities: HVAC panels, water treatment, boiler/burner management interlocks

• Material handling and intralogistics: diverters, sensors, jam detection

• OEM machine controls where standardized 24 VDC PNP sensors are used

• Proven compatibility      – Designed for Honeywell Series C/Experion, reducing validation work and integration risk.

• Lower installed cost      – 16 inputs per module with grouped commons typically simplifies wiring and reduces terminal count.

• Faster commissioning      – Channel LEDs and clear labeling help techs verify I/O points quickly. One thing I appreciate is the intuitive channel layout.

• Maintenance-friendly      – Straightforward diagnostics and accessible terminations mean less downtime in most cases.

• Support and lifecycle      – Backed by Honeywell’s support ecosystem; firmware and documentation availability typically streamlines OT/IT change control.

• Panel/cabinet requirements      – Install on the correct Honeywell DI IOTA. Provide ventilation; keep ambient within the stated operating temperature. Maintain clearance for field wiring and service loops.

• Power and wiring      – Use regulated 24 VDC for field devices. Follow group commons per the IOTA diagram. For long runs, shield and ground per Honeywell wiring practices to minimize noise.

• Safety practices      – De‑energize field circuits before landing or moving wires. Verify polarity with a meter; check channel LEDs to confirm state.

• Routine maintenance      – Periodically re‑torque terminals, inspect for dust buildup, and validate critical interlocks. Keep controller and I/O firmware aligned with approved site baselines.

• CE compliant; designed for industrial control environments

• UL/CSA listings commonly available for Series C modules

• RoHS-compliant construction

• Manufacturer’s standard warranty (typically 12 months from delivery)

• Honeywell DI IOTA (Input/Output Termination Assembly)      – The base/termination for the FC‑SDI‑1624; provides field wiring terminals and backplane connection.

• Series C controller (e.g., C300)      – Hosts the I/O over the backplane and exposes points to Experion. Choose redundancy as required by your process risk profile.

• 24 VDC industrial power supply      – Regulated, low‑ripple supply sized for all connected sensors and device loads.

• Breakers/fusing and surge suppression      – Protect input groups and improve resilience against switching transients.

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