Honeywell FTA-T-16 Fail-Safe Digital Input FTA

Overview

The Honeywell FTA-T-16 (42622268-002) is a fail-safe, active digital input Field Termination Assembly engineered for use with Honeywell Safety Manager and FSC safety control systems. It serves as the interface between field-level discrete devices and safety controllers, ensuring reliable signal acquisition under stringent safety integrity requirements.

This FTA supports sixteen isolated digital input points and incorporates active signal conditioning to detect wiring faults, power anomalies, and abnormal input states. Its design aligns with SIL-rated safety systems where deterministic behavior and fault transparency are mandatory.

Functional Characteristics

The FTA-T-16 (42622268-002) is designed to process discrete on/off signals from safety-related field devices such as emergency stop buttons, limit switches, pressure switches, and interlock contacts. Each channel operates independently to maintain system integrity even in the event of partial failures.

Active circuitry within the FTA enables stable voltage supervision, helping the controller differentiate between valid signals, open circuits, and short conditions. This architecture significantly improves diagnostic coverage compared to passive termination solutions.

Input Channel Specifications

• Total input points: 16 fail-safe digital channels

• Supported signal types: Dry contact or powered discrete inputs

• Nominal input voltage: 24 VDC or 120 VAC (hardware variant dependent)

• Typical input current: approximately 10 mA per channel

• Input impedance: nominal 10 kΩ

• Internal channel isolation: yes, channel-to-channel and field-to-system

For passive field devices, the FTA provides a supervised output supply of approximately 24 VDC. When interfaced with Honeywell safety input modules such as the 10105/2/1, signal levels are conditioned to a low-voltage range of approximately 0–3.5 VDC.

Power Requirements

• External supply voltage: 30 VDC

• Maximum current consumption: approximately 150 mA with all inputs energized

• Power distribution: internally regulated for all 16 channels

Mechanical and Physical Data

• Dimensions: 110 × 70 × 60 mm
• Weight: 0.25 kg
  

The compact form factor allows direct mounting within safety system cabinets while maintaining proper wire separation and labeling clarity.

Environmental Ratings

• Operating temperature range: –20 °C to +65 °C

• Storage temperature range: –40 °C to +105 °C

• Designed for continuous duty in industrial safety environments

System Compatibility

The FTA-T-16 (42622268-002) is fully compatible with:

• Honeywell Safety Manager systems

• Honeywell FSC (Fail-Safe Controller) platforms

• Certified Honeywell safety input modules

It is intended for use in safety instrumented systems requiring high availability and deterministic fault handling.

Typical Applications

• Emergency shutdown (ESD) systems

• Safety interlock and permissive logic

• Burner management and critical equipment protection

• Plantwide safety instrumented systems (SIS)

Frequently Asked Questions

Q: Is the FTA-T-16 interchangeable with passive digital input FTAs?
A: No. The FTA-T-16 is an active, fail-safe termination assembly with internal supervision circuitry. Passive FTAs do not provide the same diagnostic coverage or fault detection.

Q: Does this FTA perform logic processing?
A: No. The FTA only conditions and terminates field signals. Safety logic execution is performed by the associated Honeywell safety controller.

Q: Can it be used in SIL-rated applications?
A: Yes. When installed as part of a certified Honeywell safety system and used according to system documentation, it supports SIL-rated architectures.