Honeywell FS-TRO-1024 Safety PLC Relay Output Module

Product Details

FS-TRO-1024 Product Description

The Honeywell FS-TRO-1024 is a dedicated relay output module engineered for the Honeywell FSC (Fail-Safe Controller) Safety PLC platform — one of the most widely deployed SIL2/SIL3-capable safety systems in process industries worldwide. Designed to operate within a tightly integrated control architecture, the FS-TRO-1024 delivers deterministic relay switching performance, robust electrical isolation, and seamless contextual integration across the full FSC I/O subsystem. Every unit shipped by NANKMOS undergoes pre-shipment functional testing and is backed by a 12-Month Warranty, ensuring operational confidence from day one of commissioning.

In modern industrial safety architectures, relay output modules are not standalone components — they are the final execution layer in a layered control hierarchy that spans from the safety logic solver through field device actuation. The FS-TRO-1024 is purpose-built to fulfill this role within the FSC platform, providing the electrical interface between the controller's digital output signals and field-side actuators such as solenoid valves, motor contactors, shutdown relays, and alarm annunciators. Its 24-channel relay output capacity, combined with individual channel diagnostics and forced-mode capability, makes it a preferred choice for ESD (Emergency Shutdown), F&G (Fire and Gas), and BMS (Burner Management System) applications.

The FS-TRO-1024 achieves its full operational value when deployed as part of a complete FSC safety architecture. At the control layer, the Honeywell FS-CPU-0100 or FS-CPU-0200 safety logic solver executes the safety application program and issues relay output commands to the FS-TRO-1024 via the FSC internal backplane bus. This backplane communication is deterministic and cycle-synchronized, ensuring that relay actuation latency remains within the safety function's required response time.

At the power layer, the Honeywell FS-PSU-0100 power supply module provides regulated DC power to the backplane rail, supporting both the CPU and all I/O modules including the FS-TRO-1024. For high-availability installations, dual FS-PSU modules in redundant configuration eliminate single-point power failure risk — a critical requirement in ESD and F&G systems where power loss must not cause spurious trips.

On the input side, the Honeywell FS-DI-0800 digital input module and FS-AI-0400 analog input module feed process signals — from pressure switches, temperature transmitters, and gas detectors — into the CPU for safety logic evaluation. The CPU's output decisions are then executed through the FS-TRO-1024's relay channels, closing or opening field-side circuits to actuate shutdown valves, de-energize motor starters, or trigger alarm outputs.

For process control integration alongside the safety layer, the Honeywell FS-AO-0400 analog output module handles modulating control signals to control valves and variable-speed drives, while the FS-TRO-1024 handles discrete on/off actuation. This separation of modulating and discrete output functions within the same FSC rack optimizes both wiring density and diagnostic granularity.

Communication to the supervisory layer — DCS, SCADA, or historian — is handled by the Honeywell FS-COM-0100 communication module or equivalent gateway, supporting Modbus RTU, Modbus TCP, or PROFIBUS DP depending on site configuration. This allows the relay output status of each FS-TRO-1024 channel to be monitored in real time from the control room, supporting both operational visibility and maintenance diagnostics.

For large-scale installations requiring extended I/O capacity, the FSC platform supports multi-rack expansion via the FS-RCU rack unit and associated backplane extension cables, allowing additional FS-TRO-1024 modules to be added without architectural redesign. This modular scalability is particularly valuable in phased plant expansions where safety I/O requirements grow incrementally.

Terminal modules and marshalling components — such as the Honeywell FS-TBU terminal base units — provide the field wiring interface for each FS-TRO-1024 channel, enabling hot-swap module replacement without disconnecting field cables. This design significantly reduces maintenance downtime and supports online module exchange during planned maintenance windows.

Oil & Gas / Petrochemical: In upstream and downstream process facilities, the FS-TRO-1024 is deployed in ESD systems to actuate wellhead shutdown valves, compressor trip relays, and blowdown valve solenoids. Its SIL2 rating and TÜV certification satisfy the functional safety requirements of IEC 61511 for process sector applications. Paired with FS-DI and FS-AI input modules, the FSC system provides a complete safety instrumented function (SIF) from sensor to final element.

Power Generation & Utilities: In gas turbine and steam turbine control systems, the FS-TRO-1024 handles turbine trip relay outputs, fuel shutoff valve actuation, and generator protection relay interfaces. The module's high switching current rating (5A per channel) accommodates the inductive loads typical of turbine auxiliary systems without requiring intermediate relay amplifiers.

Chemical & Pharmaceutical Manufacturing: Batch process safety systems use the FS-TRO-1024 to control reactor isolation valves, agitator motor contactors, and emergency vent valve actuators. The module's per-channel diagnostic capability supports validation documentation requirements under GAMP 5 and FDA 21 CFR Part 11 frameworks.

Water & Wastewater Treatment: In pump station and treatment plant automation, the FS-TRO-1024 provides relay outputs for pump motor starters, chlorination dosing system interlocks, and overflow alarm relays. Its wide operating temperature range and humidity tolerance suit both indoor control room and outdoor weatherproof enclosure installations.

Mining & Metals: Conveyor belt safety systems, crusher interlock circuits, and hoisting equipment emergency stop relays benefit from the FS-TRO-1024's robust relay contact ratings and electrical isolation, which protect the FSC backplane from field-side voltage transients common in heavy industrial environments.

Marine & Offshore: Offshore platform ESD and F&G systems certified to IEC 61508 and DNV GL standards incorporate the FS-TRO-1024 for wellhead control panel relay outputs, deluge system actuation, and HVAC shutdown interlocks. The module's compact rack-mount form factor suits the space-constrained control rooms typical of FPSO and fixed platform installations.

Q1: Is the FS-TRO-1024 compatible with both the FSC Mark I and Mark II CPU generations? The FS-TRO-1024 is designed for the Honeywell FSC platform and is compatible with FSC CPU modules including the FS-CPU-0100 and FS-CPU-0200 series. Compatibility with specific CPU firmware versions should be verified against the FSC System Manual (document number FS-SM-0001 or equivalent). NANKMOS recommends confirming the target CPU generation and firmware revision before ordering to ensure full architectural compatibility. Our technical team can assist with cross-referencing part numbers against your existing FSC rack configuration.

Q2: Can the FS-TRO-1024 be replaced online (hot-swap) without shutting down the FSC system? When installed with compatible FS-TBU terminal base units, the FS-TRO-1024 supports online module replacement without disconnecting field wiring. However, hot-swap capability requires that the safety application be configured to handle the module's temporary absence without triggering a spurious trip — typically achieved through appropriate de-energize-to-trip logic and bypass management procedures. Full hot-swap procedures should follow the FSC System Engineering Manual and site-specific MOC (Management of Change) protocols. All NANKMOS-supplied FS-TRO-1024 units are pre-tested to ensure immediate operational readiness upon installation.

Q3: What does the 12-Month Warranty cover, and what is the lead time for replacement units? NANKMOS provides a 12-Month Warranty on all FS-TRO-1024 units covering manufacturing defects and functional failures under normal operating conditions. Each unit undergoes pre-shipment functional testing including relay contact continuity verification, isolation resistance measurement, and backplane communication handshake testing. In the event of a warranty claim, NANKMOS maintains ready stock of FS-TRO-1024 modules to support rapid replacement — minimizing system downtime. Standard lead time for in-stock units is 3–7 business days for international shipment. For critical sparing requirements, contact our team to discuss priority fulfillment and consignment stocking arrangements.