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- Model: FC-SDO-0824
- Brand: Honeywell
- Series: Safety Manager
- Core Function: Switches safety-related 24 VDC loads
- Type: Safe Digital Output Module
- Key Specs: 8 channels, 24 VDC source outputs, 550 mA maximum per channel
- Load Capacity: Up to 120 mA / 2.9 W for lamp loads
- Protection: Short-circuit protected solid-state outputs
- Applications: ESD, shutdown valves, solenoids, alarms, and other safety actuators
Product Introduction
Honeywell FC-SDO-0824 is a Safe Digital Output (SDO) module for the Safety Manager safety-control platform. It provides eight solid-state 24 VDC source outputs for switching safety-related loads such as solenoids, shutdown devices, lamps, and other discrete actuators. Honeywell’s hardware reference identifies the module as the SDO-0824 type used in Safety Manager systems.
Each channel is rated up to 550 mA, with short-circuit protection and built-in diagnostics. The eight outputs are divided into two groups of four, while a secondary de-energization path allows the watchdog and processor to remove output power independently of application logic. That detail is significant in a safety system; it is not merely another 24 VDC output card.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | FC-SDO-0824 |
| Product Type | Safe Digital Output Module |
| System | Safety Manager |
| Output Channels | 8 |
| Output Type | 24 VDC solid-state source |
| Maximum Output Current | 550 mA per channel |
| Maximum Lamp Load | 120 mA / 2.9 W |
| Load Capacitance | 1 µF maximum |
| Short-Circuit Protection | Yes |
| Voltage Drop | Less than 2.0 VDC at 500 mA |
| Off-State Current | Less than 0.1 mA |
| WDG Input Current | 8 mA |
| Internal Power | 5 VDC, 25 mA; 24 VDC internal, 25 mA |
| External Power | 24 VDC, 70 mA without output load |
| Space Requirement | 4 TE, 3 HE; approximately 4 HP, 3U |
| Approvals | CE, TÜV, UL, CSA, FM |
| Module Coding | Holes A9, C9; chassis pins A9, C9 |
| Temperature Derating | 550 mA up to 45 °C; reduced to 350 mA at 70 °C |
Honeywell’s technical data lists eight 24 VDC solid-state source outputs, a 550 mA maximum current, and the A9/C9 key-coding arrangement. The reference also notes that FC-type modules are conformally coated.
Honeywell FC-SDO-0824
Application and Selection Notes
This module is intended for safety-related discrete output switching. Typical loads include emergency shutdown solenoids, safety interlock devices, annunciation lamps, and other actuators that must be driven from a Safety Manager logic solver.
The outputs are arranged as two groups of four. Honeywell documents diagnostics for the ability to de-energize the outputs, secondary group de-energization, output crosstalk, and suppression-diode operation. For inductive loads, the module includes suppression circuitry at each output.
One specification deserves attention during replacement: the 550 mA rating is not flat across every temperature condition. Honeywell’s hardware reference shows derating at elevated ambient temperature, reaching 350 mA at 70 °C. Size the connected load from the actual cabinet temperature, not the headline current value alone.
Advantages and Limitations
Advantages
- Eight safety-rated digital output channels.
- 24 VDC solid-state source outputs.
- Up to 550 mA per channel under specified conditions.
- Short-circuit protection.
- Built-in output diagnostics.
- Secondary de-energization path for safety functions.
- Supports inductive loads with integrated suppression.
Limitations
- It is a Safety Manager-specific module, not a general PLC digital output card.
- Output-current capacity decreases at elevated temperature.
- Correct chassis key coding is required.
- Field termination and load wiring must match the installed Safety Manager architecture.
- Safety certification depends on using the module within the approved system configuration.
Quality Inspection and Pre-Shipment Checks
- Incoming inspection: Verify the Honeywell label, complete part number, module revision, connector condition, keying features, PCB coating, and signs of corrosion or previous repair.
- Live test: On a suitable Safety Manager test rack, verify module recognition, output activation/de-activation, diagnostic status, and representative resistive or approved test loads. Record the results in a Test Report.
- Electrical checks: Verify supply paths, grounding continuity, output-channel integrity, and short-circuit diagnostic behavior using an approved test procedure.
- Configuration verification: Record rack position, key-coding arrangement, associated FTA, output-channel assignment, and applicable firmware/system revision.
- Final QC: Photograph the identification label and keying features, place the module in ESD-safe packaging, add rigid cushioning, and retain the signed QC record.
Test photographs and available Test Reports can be supplied with the shipment when requested.
Technical Replacement Risks
Current-rating mistake. A 550 mA maximum does not mean every load can be operated at 550 mA under every temperature condition. At 70 °C, the documented limit falls to 350 mA.
Wrong module keying. The SDO-0824 uses specific A9/C9 key positions. The keying prevents incompatible module types from being inserted into the wrong chassis location.
Inductive-load wiring. Solenoids and similar loads generate transients. Use the specified suppression arrangement and verify polarity before energizing.
Safety configuration mismatch. A replacement card should be checked against the approved Safety Manager architecture, not treated as a normal 24 VDC DO module.
Field termination error. Photograph the existing FTA wiring before removal. That simple step helps preserve channel assignment and polarity during recommissioning.
Purchase and Logistics Notes
For international procurement, describe the item as Honeywell FC-SDO-0824 Safety Manager Safe Digital Output Module, 8-Channel, 24 VDC, 550 mA.
State the actual condition separately:
- New Original
- New Surplus
- Refurbished
- Repaired
Before shipment, request confirmation of the complete part number, hardware revision, functional-test status, warranty period, country of origin, gross weight, and package dimensions.
Supplier listings currently show this part in new condition with warranty options, while other industrial sources identify it as a legacy or discontinued spare. Actual stock status should therefore be confirmed against the specific quotation.
For export packaging, protect the module from ESD, humidity, and mechanical shock. The connector and keying areas deserve extra cushioning.
Quick Conclusion
- FC-SDO-0824 is an eight-channel Honeywell Safety Manager Safe Digital Output module.
- Outputs are 24 VDC solid-state source type, with a documented maximum of 550 mA per channel under specified conditions.
- The module includes short-circuit protection and diagnostic functions for safety output supervision.
- Output capacity derates at high ambient temperature, reaching 350 mA at 70 °C.
- Exact chassis keying, FTA wiring, load type, and Safety Manager configuration should be verified before replacement.
FAQ
What is Honeywell FC-SDO-0824?
It is a Safe Digital Output module used in Honeywell Safety Manager systems for switching 24 VDC safety-related loads.
How many outputs does it provide?
It provides 8 digital output channels.
What is the maximum output current?
The documented maximum is 550 mA per channel, subject to temperature and load conditions.
Can it drive solenoids?
Yes. The module is designed for resistive and inductive loads, and Honeywell documents suppression-diode support for inductive loads.
Does the 550 mA rating apply at 70 °C?
No. The hardware reference specifies derating, with the maximum reduced to 350 mA at 70 °C.
What should be checked before buying a replacement?
Verify the complete module code, hardware revision, chassis keying, FTA arrangement, output load, ambient cabinet temperature, and Safety Manager system configuration. A generic 24 VDC output card is not an equivalent substitute.
