Description
Core Product Summary
The Honeywell FS-SDO-0824 is a safe digital output module designed for the Honeywell Safety Manager safety system. It provides eight 24 VDC solid-state sourcing outputs for controlling compatible field loads, including resistive loads and inductive devices such as solenoids. Each output supports a documented maximum current of 550 mA, with a reduction in allowable current at elevated temperatures.
The module includes output diagnostics and secondary de-energization mechanisms intended to support safety-related operation. Its eight channels are arranged in two groups of four, with each group having a secondary means of de-energization. The module also requires the specified internal and external 24 VDC supplies to support its diagnostic self-tests correctly.
The FS-SDO-0824 is intended for use within a compatible Safety Manager architecture, not as a standalone general-purpose output card. Before replacement, confirm the module revision, field termination assembly, wiring, load characteristics, and safety configuration.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | FS-SDO-0824 |
| Product type | Safe digital output module |
| System platform | Honeywell Safety Manager |
| Output channels | 8, arranged in 2 groups of 4 |
| Output type | 24 VDC solid-state sourcing |
| Maximum channel current | 550 mA, subject to temperature derating |
| Maximum output load | Up to 13 W per load, subject to applicable limits |
| Maximum lamp load | 120 mA (2.9 W) |
| Maximum load capacitance | 1 µF |
| Voltage drop | Less than 2.0 VDC at 500 mA |
| Off-state current | Less than 0.1 mA |
| Internal 5 VDC supply | 25 mA |
| Internal 24 VDC supply | 25 mA |
| External 24 VDC supply | 70 mA without output load |
| Space requirement | 4 TE × 3 HE, equivalent to 4 HP × 3U |
| Operating output derating | Maximum channel current reduces to 350 mA at 70°C |
| Approvals listed in hardware documentation | CE, TÜV, UL, CSA, FM |
| Related terminal assembly | FS-TSDO-0824 |
| Coated variant | FC-SDO-0824 |
Specifications are based on Honeywell Safety Manager hardware documentation. Verify the exact module revision and applicable installation requirements.
Engineering Selection Highlights
- Eight safety outputs: Provides eight 24 VDC solid-state sourcing channels for compatible field loads.
- Diagnostic testing: Checks output de-energization, secondary de-energization, crosstalk, and suppression-diode operation.
- Grouped output architecture: Two groups of four outputs have independent secondary de-energization provisions.
- Short-circuit protection: The outputs are documented as short-circuit proof.
- Temperature-dependent capacity: The maximum current must be derated at elevated ambient temperatures.
- Defined rack footprint: The module occupies 4 TE × 3 HE (4 HP × 3U).
- Configuration-sensitive replacement: The module must match the installed Safety Manager hardware and field wiring architecture.
System Compatibility and Integration Requirements
| Integration area | Requirement |
|---|---|
| Safety controller | Compatible Honeywell Safety Manager architecture |
| Field termination assembly | Verify compatibility with FS-TSDO-0824 and the installed wiring arrangement |
| Interconnection | Confirm the applicable SICC ribbon cable and connector configuration |
| Field supply | Verify the internal and external 24 VDC supply connections |
| Output loads | Check current, voltage, load type, and temperature derating |
| Safety configuration | Confirm channel assignments and application logic |
| Module revision | Check the installed version and the proposed replacement |
| Environmental conditions | Confirm whether the non-coated FS or coated FC variant is required |
Do not assume the FS-SDO-0824 can be connected directly to a Honeywell Experion controller or used outside the Safety Manager architecture. Compatibility depends on the complete system configuration.
FS-SDO-0824
FS-SDO-0824
Dimensions, Mounting, and Connection Notes
Rack space: 4 TE × 3 HE (4 HP × 3U).
The module uses a keyed backplane connection. The documented key coding identifies module holes A9 and C9, with matching large chassis pins at A9 and C9.
Important connection considerations:
- Verify the rack slot and mechanical key coding before installation.
- Confirm the matching field termination assembly and interconnection cable.
- Connect the required internal and external 24 VDC supplies according to the hardware manual.
- Verify output polarity, field wiring, and load current before enabling outputs.
- Confirm that the connected load remains within the specified limits at the actual cabinet temperature.
Honeywell documentation warns that the internal and external supply connections must be correctly established to prevent fault detection during the module’s self-test.
Detailed Product Overview
Output architecture
The FS-SDO-0824 contains eight 24 VDC solid-state sourcing outputs, arranged in two groups of four. Each output includes a suppression diode for compatible inductive loads. The outputs and associated suppression circuits are tested as part of the module’s diagnostic regime.
Safety diagnostics
The module performs diagnostic tests at the configured Diagnostic Test Interval. Documented checks include the ability to de-energize an output, secondary de-energization of an output group, crosstalk between outputs, and operation of the suppression diodes.
The secondary means of de-energization allows the watchdog and processor to de-energize outputs independently of the application function. The overall safety capability still depends on the approved Safety Manager architecture and application design.
Power and load management
The module uses 5 VDC, internal 24 VDC, and external 24 VDC supplies. The documented supply requirements are specified separately, and the external supply current figure excludes the output load.
The 550 mA maximum channel-current rating is not unconditional. At 70°C, the documented limit reduces to 350 mA per channel. Engineers should evaluate actual cabinet ambient temperature and load duty before approving the output circuit.
FS and FC variants
The FS-SDO-0824 is the non-conformal-coated version. The related FC-SDO-0824 is conformal coated for applications with different environmental requirements. These variants should not be selected by appearance alone; confirm the environmental specification and project requirements.
Maintenance and replacement
Before replacing a module, document the existing channel assignments, load wiring, supply connections, module revision, and Safety Manager configuration. After installation, qualified personnel should perform the prescribed diagnostic and functional checks.
Because this is safety-system hardware, maintenance must follow the site’s safety instrumented system procedures, management-of-change requirements, and approved bypass controls. Do not remove or replace the module without assessing the effect on the associated safety functions.
Applications and System Role
The FS-SDO-0824 provides output signals within a Honeywell Safety Manager installation. Typical field loads may include compatible solenoids, interposing relays, indicator devices, and other equipment whose electrical requirements fit the output ratings.
Potential system applications include:
- Emergency shutdown systems
- Process safety interlocks
- Burner and equipment shutdown functions
- Industrial alarm and annunciation circuits
- Safety-related actuation in process plants
These are application examples, not a blanket approval for every safety function. Suitability depends on the certified system architecture, safety requirements, field-load characteristics, and application design.
Frequently Asked Questions
Q1: What is the Honeywell FS-SDO-0824?
It is an eight-channel safe digital output module for the Honeywell Safety Manager system.
Q2: What is the maximum output current?
The documented maximum is 550 mA per channel, with a reduction to 350 mA at 70°C.
Q3: How many output channels does it have?
Eight channels, arranged in two groups of four.
Q4: What is the matching field termination assembly?
The associated field termination assembly is FS-TSDO-0824. Verify the exact terminal assembly and cable arrangement against the installed hardware documentation.
Q5: What is the difference between FS-SDO-0824 and FC-SDO-0824?
The FS version is non-conformal coated; the FC version is conformal coated. Select the version appropriate to the installation’s environmental requirements and verify compatibility before replacement.
Q6: Can it drive solenoid valves directly?
It can drive compatible loads within its documented electrical limits. Check the solenoid’s steady-state and inrush characteristics, inductive suppression requirements, and applicable output derating before connection.
Q7: Can it be used as a standalone output card?
No. It is designed for the Honeywell Safety Manager architecture and must be used in a compatible system configuration.
Q8: What should be checked before ordering a replacement?
Confirm the full model number, revision, terminal assembly, rack compatibility, output load requirements, supply wiring, and installed safety configuration.
Start Chat
