Honeywell FTA-T-01 Fail-Safe Digital Input Field Termination

Product Description

The Honeywell FTA-T-01 Fail-Safe Digital Input Field Termination Assembly is designed as a robust signal interface between safety control systems and field-level digital devices. It is commonly deployed in Honeywell Fail-Safe Control (FSC) architectures and compatible safety systems where deterministic signal integrity and fault tolerance are mandatory.

This FTA acts as a passive termination and protection layer, routing multiple discrete input signals from external devices into the control system through fused, isolated channels. Its design supports safety instrumented functions by ensuring predictable behavior under fault conditions, including wiring errors, overvoltage events, or component failures.

The FTA-T-01 is optimized for cabinet-mounted safety systems and provides high-density termination without compromising accessibility or maintainability.

Functional Overview

The Honeywell FTA-T-01 supports twenty-four independent fail-safe digital input paths, organized into three electrically grouped sections. Each channel incorporates individual protection to prevent a single fault from propagating across the system.

Key operational characteristics include:

Non-intrusive termination of discrete field signals
Channel-level fuse protection for controlled fault isolation
Mechanical and electrical compatibility with Honeywell FSC interconnection cables
Fail-safe signal routing suitable for SIL-rated systems

Technical Specifications

Electrical Characteristics

• Total Input Channels: 24 fail-safe digital inputs

• Channel Grouping: 3 isolated sections, 8 channels per group

• Nominal Input Voltage: 24 / 48 / 60 VDC

• Maximum Rated Voltage (IEC 1010):

• Category III: 36 VAC or 50 VDC

• Category II: 125 VAC or 150 VDC

• Fuse Type: Slow-blow

• Fuse Rating: 250 mA per channel

• Input Protection: Overcurrent and transient suppression

Mechanical & Installation Data

• Mounting Method: DIN rail installation

• Supported Rail Types: TS32 and TS35 (7.5 mm profile)

• Recommended Rail Length: 146 mm

• Field Wiring Interface: Screw-clamp terminals

• Maximum Conductor Size: 2.5 mm² (AWG 14)

• Wire Strip Length: 7 mm

• Terminal Torque: 0.5 Nm

Physical Properties

• Dimensions: 145 × 70 × 65 mm

• Weight: 0.47 lb

Typical Applications

The FTA-T-01 is widely used in environments where signal reliability directly impacts personnel safety and equipment protection, including:

Emergency shutdown systems
Burner management systems
Turbomachinery protection
Process interlocks and permissives
Safety-related machine control circuits

System Compatibility

This Field Termination Assembly is intended for use with Honeywell Fail-Safe Control systems and associated safety controllers that rely on remote FTAs for structured field wiring. It integrates seamlessly with Honeywell system cables and complies with established FSC installation practices.

Frequently Asked Questions

Q: Is the FTA-T-01 an active I/O module?
A: No. The FTA-T-01 is a passive termination assembly. It does not perform signal processing or logic functions.

Q: Are the input channels individually fused?
A: Yes. Each channel includes a slow-acting fuse to localize faults and improve system availability.

Q: Can it be installed in non-safety systems?
A: While primarily designed for safety architectures, it may be used in non-SIS applications requiring robust digital signal termination, provided voltage limits are respected.