Description
The Honeywell FC-FANWR-24R is a safety-certified, fail-safe relay output module designed for use within the Safety Manager and Safety Manager SC architectures. It provides high-integrity digital output switching for critical industrial applications, including Emergency Shutdown (ESD) systems, Burner Management Systems (BMS), and Fire and Gas (F&G) safety loops. The module converts low-power internal safety logic commands into isolated, high-capacity relay contact closures capable of driving field actuators, interposing relays, and solenoid valves.
Technical Specifications
| Parameter | Value / Specification |
| Manufacturer | Honeywell |
| Model Number | FC-FANWR-24R |
| System Architecture | Safety Manager / Safety Manager SC |
| Module Type | Fail-Safe Relay Output Module |
| Number of Channels | 24 isolated relay output channels |
| Nominal Input Voltage | 24 V DC (Internal system logic side) |
| Contact Configuration | Normally Open (NO) safety contacts per channel |
| Maximum Switching Voltage | 250 V AC / 125 V DC (Verify exact load limits per inductive/resistive classification) |
| Maximum Continuous Current | 2 A per channel (Subject to total module thermal derating curves) |
| Safety Integrity Level | Up to SIL 3 (IEC 61508) when configured in compliance with safety manuals |
| Galvanic Isolation | Channel-to-channel and channel-to-logic isolation |
| Power Dissipation | Approximately 5.5 W at nominal load |
| Operating Temperature | −15 to +60°C (+5 to +140°F) |
| Storage Temperature | −40 to +85°C (−40 to +185°F) |
Commercial and Logistics Terms
- Condition: New Original (Factory Sealed) or high-quality New Surplus with complete trace documentation.
- Availability: In stock. Standard engineering inspection and processing require 1 to 2 business days prior to dispatch.
- Shipping & Lead Time: Global express courier options via DHL, FedEx, and UPS. Typical transit time to most industrial corridors is 3 to 5 business days.
- Warranty: 12-month industrial hardware warranty covering component failure and functional adherence to OEM specifications.
- Pricing Notice: Price is subject to market availability and current component supply chains. Contact our projects desk for a binding commercial quotation.
Engineering Context & Implementation Notes
Safety Integrity and Loop Design
The FC-FANWR-24R is engineered to ensure a predictable, de-energize-to-trip (fail-safe) state. In the event of an internal hardware fault, loss of system power, or processor watchdog timeout, the relay contacts are mechanically and electrically forced open. Internal diagnostic routines continuously monitor the health of the output drivers and the consistency of the relay feedback loops without interrupting field operations.
Inductive Load Suppression
When controlling highly inductive loads such as heavy-duty solenoids, motor starter coils, or magnetic brakes, transient voltage spikes (back-EMF) will occur during contact opening.
- DC Circuits: Install a free-wheeling diode (e.g., 1N4007) parallel to the load.
- AC Circuits: Install a properly sized RC snubber circuit across the load or the contacts.
Failure to provide adequate transient suppression will accelerate contact degradation, cause contact welding, and compromise the safety loop’s reliability.
Wiring and Redundancy Configurations
Field wiring terminates via matching FTA (Field Termination Assembly) boards and dedicated multi-core cables. For high-availability scenarios where false trips must be eliminated alongside safety failures, these modules can be implemented in redundant topologies (dual-fault tolerant configuration) where output circuits are wired in specific series/parallel matrices to achieve both safety execution and uptime operational goals.
Frequently Asked Questions
Can the FC-FANWR-24R be hot-swapped while the safety system is online?
Yes, in a properly configured redundant Safety Manager chassis, you can replace a faulty FC-FANWR-24R module online without shutting down the process. The system automatically mirrors the configuration onto the replacement module once it completes its initial power-on self-test (POST). Ensure the secondary slot or redundant partner is fully operational before executing a hot-swap.
What causes a “Channel Readback Error” on this module?
A readback error occurs when the internal diagnostic logic detects a mismatch between the commanded state of the safety relay and the actual physical position of the contact execution loop. This can be caused by welded contacts due to overcurrent, a failure in the internal driving circuitry, or extreme external voltage fluctuations. If the error persists after a power cycle, replace the module immediately.
What is the maximum cross-sectional area for field wiring on the associated FTAs?
While the module itself slots directly into the safety subrack, the associated field termination assemblies typically support solid or stranded conductors ranging from 0.5 to 2.5 mm² (24 to 12 AWG). Refer to the specific Honeywell FTA manual used in your cabinet design to verify exact torque settings and terminal limits.
| Honeywell 05701-A-0302 Single-Channel Control Card |
| Honeywell 05704-A-0144 System 57 Quad Control Card |
| Honeywell FC-QPP-0002 – Quad Processor Pack |
| Honeywell CC-PWRR01 – Redundant Power Supply Module |
