Honeywell FTA-T-08 – 8-Channel Digital Output Field Termination Assembly | TDC 3000 / TotalPlant Series
Engineering Background: The Honeywell TDC 3000 and TotalPlant Solution (TPS) distributed control systems represent the backbone of process automation in continuous-process industries. Within this architecture, Field Termination Assemblies (FTAs) serve as the critical interface layer between the controller I/O modules and field-mounted actuators, solenoids, and discrete devices. The FTA-T-08 occupies the digital output tier of this interface layer, providing eight independently driven output channels that translate controller logic into field-level switching actions. Its role is deterministic: every valve open/close command, motor start/stop signal, and alarm relay activation passes through this assembly before reaching the process.
Product Positioning: The FTA-T-08 is distinguished from analog output FTAs (such as the FTA-T-04 series) by its discrete, on/off switching architecture optimized for solenoid valves, motor starters, and indicator lamps rather than modulating control loops. Compared to the FTA-T-16 (16-channel variant), the FTA-T-08 is preferred in applications where channel density must be balanced against per-channel current capacity and cabinet space constraints. It is not a substitute for intrinsically safe FTAs in Zone 0/1 hazardous areas without additional barrier conditioning.
Complete Technical Specifications
Electrical
- Number of Output Channels: 8
- Output Type: Discrete (Digital) Output, solid-state or relay-driven
- Output Voltage Range: 24 V DC nominal (field side)
- Output Current per Channel: Up to 0.5 A continuous (consult datasheet for derating at elevated temperature)
- Isolation: Channel-to-channel and channel-to-backplane isolation per IEC 61131-2
- Short-Circuit Protection: Electronic current limiting per channel
- Power Supply Input: Derived from TDC 3000 / TPS I/O bus; no separate field power wiring required for logic side
Mechanical
- Form Factor: DIN-rail or card-cage mountable FTA module
- Connector Type: Screw-terminal field wiring (removable terminal block)
- Weight: 260 g (nominal)
- Dimensions: Refer to Honeywell drawing 51304485-xxx for exact envelope
- Wiring Capacity: Up to 2.5 mm² (14 AWG) per terminal
Environmental
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5% to 95% non-condensing
- Vibration: IEC 60068-2-6 (sinusoidal), IEC 60068-2-64 (random)
- Ingress Protection: IP20 (module body); enclosure-dependent for installed protection
Certifications
- CE Marking: EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- UL/cUL Listed: Industrial Control Equipment
- RoHS Compliant: Directive 2011/65/EU
- Compatible with SIL 2 safety loops when used with appropriate safety-rated I/O modules (verify SIL claim with Honeywell FSE documentation)
Data source: Honeywell Process Solutions product datasheet 51304485, TDC 3000 I/O Subsystem Design Guide (Doc. No. EP-DS-0002), and Honeywell TPS Hardware Planning Guide. Specifications subject to revision; confirm against current Honeywell documentation for safety-critical applications.
Proven Application Environments
- Petroleum Refining – Crude Distillation Unit: Solenoid valve actuation on overhead reflux control loops; high-cycle duty under continuous 24/7 operation with ambient temperatures up to 55 °C in the marshalling cabinet.
- Petrochemical – Ethylene Cracker: Motor starter enable/disable signals for feed pump sequencing; requires deterministic output response under emergency shutdown (ESD) conditions.
- Power Generation – Coal-Fired Boiler BOP: Burner management system (BMS) discrete outputs for igniter and fuel valve control; subject to high-frequency vibration from turbine hall proximity.
- Water Treatment – Municipal WWTP: Pump station start/stop and valve open/close commands across multiple remote I/O drops; long cable runs requiring robust output drive capability.
- Pulp & Paper – Recovery Boiler: Sootblower sequencing outputs; high-temperature marshalling environment with condensation risk during seasonal shutdowns.
- LNG Terminal – Loading Arm Control: ESD valve actuation outputs integrated into a TPS-based safety instrumented system; requires full traceability of module provenance and test records.
Engineering Advantages
- For high-cycle solenoid valve applications, this Field Termination Assembly delivers sustained output reliability, because its solid-state output stage eliminates mechanical contact wear that degrades relay-based alternatives over millions of switching cycles.
- For cabinet space-constrained marshalling rooms, this FTA reduces wiring density, because the removable screw-terminal block allows pre-wired field cables to be disconnected from the module without disturbing individual conductors during module replacement.
- For plants running TDC 3000 or TPS platforms, this assembly ensures zero firmware compatibility risk, because it is a native Honeywell I/O component designed and validated within the TDC 3000 hardware ecosystem.
- For maintenance teams executing hot-swap procedures, this module supports in-service replacement, because the FTA design separates field wiring termination from the active electronics, allowing module swap without process interruption in non-safety-critical loops.
- For ESD and safety loop applications, this FTA provides a documented hardware baseline, because full Honeywell factory test records and certificates of conformance are available to support SIL verification audits.
- For procurement engineers managing multi-site spares standardization, this module offers cross-site interchangeability, because the FTA-T-08 form factor and pinout are consistent across TDC 3000 hardware revisions, reducing the number of unique spare part numbers required.
System Architecture & Signal Flow
Signal Flow: Controller I/O card (HPM/LCN node) → backplane bus → FTA-T-08 output driver circuitry → screw-terminal field wiring → field device (solenoid coil, motor starter contactor, or indicator lamp). The FTA-T-08 receives the digital command state from the I/O module via the backplane connector and drives the corresponding field terminal to the commanded voltage state.
Compatible Modules:
- Honeywell HPM (High-Performance Process Manager): Primary host I/O module; FTA-T-08 is a validated termination assembly for HPM digital output cards.
- Honeywell LCN (Local Control Network) I/O subsystem: Compatible when used with the appropriate I/O link interface module.
- Honeywell FSC (Fail-Safe Controller): Consult Honeywell FSC hardware manual before use in safety-rated loops; additional qualification may be required.
Substitution Conditions: The FTA-T-08 may be considered as a direct replacement for a failed unit of the same part number. Cross-substitution with FTAs from other Honeywell series (e.g., FTA-T-16 or Series C FTAs) requires verification of backplane connector compatibility, channel count mapping, and I/O module firmware version. Substitution in SIL-rated loops requires re-validation per IEC 61511.
Sourcing & Quality Verification
Source: Units offered through Konmask.com are sourced from authorized distribution channels and verified surplus inventory from decommissioned Honeywell TDC 3000 / TPS installations. Each unit undergoes a structured incoming inspection before listing.
4-Step Inspection Process:
- Visual & Mechanical Inspection: Examination of PCB, terminal blocks, backplane connector pins, and housing for physical damage, corrosion, or evidence of field abuse.
- Label & Part Number Verification: Confirmation of Honeywell part number, revision level, and date code against the FTA-T-08 product family matrix.
- Functional Bench Test: Each output channel is exercised under rated load conditions to verify switching response and output voltage compliance.
- Cleaning & Packaging: ESD-safe cleaning, anti-static packaging, and humidity indicator card inclusion prior to shipment.
Available Documentation:
- Honeywell Certificate of Conformance (where available from original supply chain)
- Inspection report from Konmask incoming QC
- Functional test record (channel-by-channel)
- Honeywell product datasheet (51304485 series)
- Decommissioning records (where available from source installation)
Procurement Process
- Submit Inquiry: Contact Konmask.com via the product page inquiry form or directly at support@konmask.com with your required quantity, delivery timeline, and any specific revision or date-code requirements.
- Quotation & Stock Confirmation: A response with confirmed stock status, unit price, lead time, and available documentation will be provided within 24 hours on business days.
- Order & Shipment: Upon purchase order confirmation, units are prepared with full inspection documentation and shipped via tracked courier with ESD-safe packaging. Export documentation for cross-border shipments is prepared in compliance with applicable trade regulations.
Technical Support: Pre-sale technical support is available for compatibility verification, system architecture questions, and documentation requests. Post-sale support covers installation guidance and cross-reference assistance. Contact: support@konmask.com | +0086 19859288691.
Technical FAQ
Q: Is the FTA-T-08 compatible with both TDC 3000 and TotalPlant Solution (TPS) systems?
A: Yes. The FTA-T-08 is a native component of the Honeywell TDC 3000 / TPS I/O hardware family. It is compatible with HPM-based digital output I/O cards in both TDC 3000 and TPS configurations. Verify the specific I/O card part number and backplane slot assignment against the Honeywell I/O Subsystem Design Guide before installation.
Q: Can the FTA-T-08 replace an FTA-T-16 if only 8 channels are in use?
A: Not as a direct drop-in replacement. The FTA-T-16 and FTA-T-08 differ in physical form factor, backplane connector pinout, and channel mapping. Substituting an FTA-T-08 for an FTA-T-16 requires a hardware re-termination, I/O configuration change in the DCS database, and re-commissioning of the affected I/O points. This substitution is feasible during a planned shutdown but is not a hot-swap operation.
Q: Is the FTA-T-08 suitable for use in a SIL 2 safety instrumented function (SIF)?
A: The FTA-T-08 can be incorporated into a SIL 2 SIF when used in conjunction with a Honeywell FSC or equivalent safety-rated I/O module and when the complete safety loop has been assessed per IEC 61511. The FTA itself is a hardware component; SIL suitability depends on the full loop architecture, PFD calculation, and proof test interval. Honeywell FSE documentation and a certified functional safety engineer review are required before deployment in a safety-rated application.
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