Honeywell FC-UDOF01 | Digital Output Relay | Fire & Gas 24 VDC Interface

Description

Honeywell FC-UDOF01 | Digital Output Relay Adaptor for Fire & Gas Systems

Key Technical Specifications

Honeywell’s Universal Marshalling Solution documentation identifies FC-UDOF01 as a single-channel isolated digital output relay adaptor for Fire & Gas applications. The published specification gives a 24 VDC input, 24 VDC maximum switched output voltage, and a maximum 2 A field output current.

Honeywell also specifies a 37-pin D-sub interface for the SIC cable, screwless backplane mounting, 141.5 × 85.75 × 10 mm dimensions, and 1500 VAC RMS input-to-output isolation.

FC-UDOF01

Product Introduction

The Honeywell FC-UDOF01 is a single-channel digital output relay adaptor designed for Honeywell’s Universal Marshalling Solution for Safety Systems. Its intended application is Fire & Gas output interfacing, where a safety-system digital output must drive a 24 VDC field device while maintaining electrical isolation and providing field-line diagnostic capability. Honeywell identifies the module as a SIL 2 device under IEC 61508.

This is an output interface/adaptor, not the safety controller or digital output I/O processor itself. It sits within the marshalling layer and interfaces with the safety-system side through the SIC cable while receiving field-side 24 VDC power through the UMS architecture. That distinction is important when troubleshooting a failed field output: a problem may originate in the safety-system I/O, the adaptor, the external 24 VDC supply, field wiring, or the connected actuator.

Application Scenarios & Field Pitfalls — The Engineer’s Perspective

Engineering Pain Point

The FC-UDOF01 is intended to simplify Fire & Gas digital-output marshalling, but its 2 A output capability is not equivalent to saying every UMS installation can simultaneously drive every channel at 2 A. Honeywell specifies aggregate loading limits for the FC-USCA01 assembly. Where multiple FC-UDOF01 modules are installed, the available 24 VDC field power must be checked against the number of active channels and actual load current.

Typical Applications

• Fire & Gas shutdown outputs driving 24 VDC solenoid valves.
• Safety-system outputs driving contactors, relays, or other discrete actuators.
• Universal marshalling cabinets where safety-system outputs are converted to field-level relay interfaces.
• Zone 2 / Class I Division 2 installations using the appropriate certified Honeywell UMS configuration.

Technical Pitfalls to Avoid

1. Do not confuse FC- with FC-UDOR01. Both are digital-output relay adaptors, but Honeywell specifically positions for Fire & Gas applications. The system design and certification requirements should determine the correct module.
2. Check the actual field load current. The documented maximum is 2 A at 24 VDC per FC-, but Honeywell limits the aggregate loading when multiple adaptors are installed on an FC-USCA01. The published limits include 12 channels at 1.5 A, 8 channels at 2 A, or all 16 channels at 0.5 A.
3. Verify external 24 VDC power. The adaptor itself has a 24 VDC input, and field-side power is supplied through the UMS arrangement. A missing field supply can look like a failed relay/output module during commissioning.
4. Use the line-monitoring function correctly. Honeywell documents open-wire and short-wire fault transparency for the field cable. The field load and wiring arrangement must therefore be compatible with the monitoring method rather than simply wired as an ordinary relay contact.
5. Do not substitute based only on terminal appearance. FC- is keyed against incorrect installation and is designed for a specific UMS backplane/baseplate architecture. The mechanical keying and associated FC-USCA01 assembly should be verified before replacement.
6. Confirm the safety certification applicable to the installation. Honeywell’s documentation identifies SIL 2 and hazardous-area certifications, but the complete installed safety function still depends on the certified architecture, configuration, field device, and application.

Related Products

• Honeywell FC-UDOR01 — Digital output relay adaptor for general safety applications; function is closely related, but is specifically identified for Fire & Gas service.
• Honeywell FC-USCA01 — Universal Signal Conditioning Assembly / high-current baseplate that provides the mounting and field-power infrastructure for UMS adapters.
• Honeywell FC-UDIR01 — Single-channel digital input relay adaptor; input rather than output function.
• Honeywell FC-UDI501 — Digital input adaptor with 5 kΩ resistor for specific 24 VDC input applications.
• Honeywell FC-UDIN01 — NAMUR proximity-switch input adaptor; designed for input sensing rather than field output switching.
• Honeywell FC-UGAO01 — Analog output isolator/barrier; used for 4–20 mA applications rather than discrete relay outputs.
• Honeywell FC-UGDA01 — Digital input/output isolation barrier with a different signal-conditioning architecture.
• Honeywell FC-UDNS01 — Safety NAMUR digital input adaptor for proximity-switch applications.

Procurement and Replacement Note

For an replacement, verify the complete Honeywell model number, UMS/FC-USCA01 baseplate configuration, SIC cable, safety-system I/O channel, field load current, 24 VDC supply capacity, and installed certification requirements.

The critical electrical distinction is that this is a single-channel Fire & Gas digital output relay adaptor with a maximum 24 VDC / 2 A switched output. It should not be treated as a generic safety-system DO card. The field wiring and aggregate FC- power loading must be checked before commissioning.

Honeywell’s current UMS documentation also identifies FC- as a SIL 2 adaptor and specifies operation from -40°C to +70°C, making the exact environmental and safety certification relevant when replacing hardware in an existing cabinet.