HONEYWELL FC-SDO-0824 | Safe Digital Output Module

Description

Core Product Summary

The HONEYWELL FC-SDO-0824 is a conformal-coated safe digital output module designed for Honeywell Safety Manager systems. It provides eight 24 V DC solid-state sourcing outputs for controlling compatible field loads in safety-related applications.

Each output is rated for a maximum current of 550 mA under specified operating conditions. The module includes short-circuit protection and diagnostic functions that help verify output behavior and support safe de-energization. Its conformal coating distinguishes the FC version from the non-coated FS-SDO-0824 variant.

The module is intended for integration with compatible field termination assemblies and Safety Manager hardware. Before ordering a replacement, verify the exact module revision, output load requirements, chassis coding, and field wiring arrangement.

 

Key Technical Specifications

Parameter	Specification
Manufacturer	Honeywell
Model	FC-SDO-0824
Product type	Safe digital output module
System family	Honeywell Safety Manager
Number of output channels	8
Output type	24 V DC solid-state source
Maximum output current	550 mA per channel under specified conditions
Output current at 70°C	Limited to 350 mA
Maximum lamp load	120 mA (2.9 W)
Maximum load capacitance	1 µF
Voltage drop	Less than 2.0 V DC at 500 mA
Off-state current	Less than 0.1 mA
Short-circuit protection	Yes
5 V DC supply requirement	25 mA
Internal 24 V DC supply requirement	25 mA
External 24 V DC supply requirement	70 mA without output load
Watchdog input current	8 mA
Module space requirement	4 TE × 3 HE (4 HP × 3U)
Module key coding	A9, C9
Chassis key coding	Large pins A9, C9
Coating	Conformal coated
Documented approvals	CE, TÜV, UL, CSA, FM

The maximum output current is subject to thermal derating and the applicable load configuration. Consult the hardware reference for permitted total load, ambient-temperature limits, and connection requirements.

prod-edam.honeywell.com+1

 

Engineering Selection Highlights

• Eight discrete outputs: Controls multiple compatible field loads from one Safety Manager I/O module.
• 24 V DC sourcing outputs: Supplies current to connected loads when the corresponding output is energized.
• Short-circuit protection: The outputs are specified as short-circuit-proof, supporting protection against certain output wiring faults.
• Secondary de-energization mechanism: The module architecture supports a secondary means of de-energizing outputs independently of the application command.
• Output diagnostics: Periodic diagnostic tests cover de-energization capability, group de-energization, output crosstalk, and suppression-diode function.
• Inductive-load support: The documented design includes suppression diodes for inductive loads, subject to the module’s electrical limits.
• Conformal-coated construction: The FC variant is designed with conformal coating; confirm whether this variant is required by the installed system.
• Defined chassis coding: The specified A9/C9 coding helps prevent incompatible module insertion.

System Compatibility & Integration Requirements

The FC-SDO-0824 is part of the Honeywell Safety Manager output-module family. It must be paired with compatible chassis, field termination hardware, power distribution, and application configuration.

Integration item	Requirement
Controller platform	Compatible Honeywell Safety Manager system
I/O function	Safe digital output
Field voltage	24 V DC
Output wiring	Compatible sourcing-output field circuit
Field termination	Select a compatible safe digital output termination assembly
Chassis interface	Verify A9/C9 module and chassis coding
Power supplies	Confirm 5 V DC, internal 24 V DC, and external 24 V DC requirements
Load sizing	Verify per-channel current, total load, lamp load, capacitance, and temperature derating
Safety configuration	Validate output behavior and the required de-energization response

The FC-SDO-0824 should not be treated as interchangeable with the non-coated FS-SDO-0824 or with other output modules without confirming the required hardware variant and system compatibility.

 

Dimensions, Mounting & Connection Notes

The manufacturer’s hardware reference specifies a module space requirement of 4 TE × 3 HE (4 HP × 3U). A verified external width, height, and depth for the exact FC-SDO-0824 revision was not established from the technical data reviewed.

Installation considerations:

• Confirm the module’s assigned chassis position and A9/C9 key coding.
• Verify that the selected field termination assembly supports the required output type and load.
• Check the 24 V DC field supply and the internal module supply requirements.
• Calculate the current demand of each connected load and observe temperature-related derating.
• Ensure that inductive loads and their suppression arrangements comply with the module’s specifications.
• Follow the approved procedures for isolation, module replacement, testing, and commissioning.
• Check module diagnostics and verify that outputs reach the required safe state under the prescribed test conditions.

Do not use a dimensional drawing for a different Safety Manager output module as a substitute for the FC-SDO-0824 mechanical specification.

 

Detailed Product Overview

Output Architecture

The FC-SDO-0824 provides eight 24 V DC solid-state sourcing outputs. Each channel supplies current to a compatible load when commanded on, within the module’s specified current and thermal limits.

The maximum stated current is 550 mA per channel under applicable conditions. At an ambient temperature of 70°C, the maximum output current is limited to 350 mA. Engineers must therefore assess both individual channel demand and the permitted overall module loading before connecting field devices.

Short-Circuit Protection and Load Compatibility

The outputs are specified as short-circuit-proof. The module supports compatible resistive and inductive loads, with suppression diodes included for inductive-load protection.

Load selection must account for inrush current, steady-state current, switching behavior, capacitance, and any restrictions specified in the hardware reference. The documented maximum lamp load is 120 mA (2.9 W), and maximum load capacitance is 1 µF. These limits should be observed even when the nominal current rating of a channel appears sufficient.

Safety De-Energization and Diagnostics

The SDO-0824 architecture includes a secondary means of de-energizing outputs. This mechanism enables the watchdog and processor to de-energize the outputs independently of the application’s output command.

Diagnostic tests are performed at configured intervals. These include checks of the ability to de-energize outputs, secondary group de-energization, crosstalk between outputs, and suppression-diode operation. Correct operation must be confirmed through the approved maintenance and functional-test procedures for the installed system.

Power Requirements

The module requires 5 V DC at 25 mA, internal 24 V DC at 25 mA, and external 24 V DC at 70 mA when no output load is connected. These base requirements should be included in the system power budget in addition to the demand imposed by the connected field devices.

The external supply and field wiring must be sized for the actual load and the applicable protection requirements. Do not use the no-load supply figure as the total current required by an operating module.

Conformal-Coated Variant

Honeywell distinguishes FC-type modules as conformal-coated and FS-type modules as non-conformal-coated. The FC-SDO-0824 is therefore the coated variant of the SDO-0824 family.

When replacing an existing unit, confirm whether the application specifies the FC version. A matching channel count and output rating do not, by themselves, establish that a different variant is an approved replacement.

Procurement and Replacement Guidance

For accurate sourcing, provide the full FC-SDO-0824 model number, any version or suffix markings, and photographs of the module label and connectors. Confirm the installed Safety Manager hardware, field termination assembly, load characteristics, and environmental conditions.

Before returning a replaced module to service, perform the required diagnostic and functional checks, including verification of output operation and the prescribed safe-state response.

 

Applications & System Role

The FC-SDO-0824 provides discrete output control in compatible Honeywell Safety Manager systems. It is intended for applications where the controller must command field devices through safety-related output circuits.

Potential applications include:

• Emergency shutdown system outputs.
• Solenoid and compatible actuator control.
• Safety-related relay or interface control.
• Process isolation and shutdown commands.
• Industrial equipment interlocks.
• Discrete alarm or status devices within the module’s electrical limits.
• Replacement and maintenance of installed Safety Manager output hardware.

The actual safety function depends on the complete system design, output termination hardware, connected loads, application logic, and approved safety requirements. The presence of a safe output module alone does not establish the integrity level of the entire safety function.

 

Frequently Asked Questions

Q1: What is the HONEYWELL FC-SDO-0824?

It is a conformal-coated, eight-channel safe digital output module designed for Honeywell Safety Manager systems.

Q2: What is the output voltage?

The module provides 24 V DC solid-state sourcing outputs.

Q3: What is the maximum current per channel?

The stated maximum is 550 mA per channel under specified conditions. At 70°C, the output current is limited to 350 mA.

Q4: Does the module support inductive loads?

Yes, compatible inductive loads are supported, with suppression diodes included in the documented design. The load must remain within the module’s electrical and thermal limits.

Q5: What power supplies does the module require?

The documented requirements are 5 V DC at 25 mA, internal 24 V DC at 25 mA, and external 24 V DC at 70 mA without output load.

Q6: What is the difference between FC-SDO-0824 and FS-SDO-0824?

The FC version is conformal-coated, while the FS version is non-conformal-coated. Confirm the required variant before substituting one for the other.

Q7: What field termination hardware should be used?

Use a termination assembly documented as compatible with the Honeywell Safety Manager SDO-0824 output type and the intended field wiring. Verify the exact assembly against the installed system documentation.

Q8: What should be checked before replacing the module?

Verify the model and revision, chassis coding, termination hardware, 24 V DC field supply, load current, thermal derating, and required output diagnostics and safe-state tests.