HONEYWELL FC-TSDI-16UNI | 16-Channel Safe Digital Input FTA

Description

Core Product Summary

The HONEYWELL FC-TSDI-16UNI is a conformal-coated, 16-channel safe digital input field termination assembly (FTA) for Honeywell Safety Manager systems. It provides the interface between field wiring and the system interconnection cable, supporting compatible 24/48 V DC and NAMUR input circuits.

The assembly divides its 16 channels into two groups of eight, with a shared positive supply protected by a 250 mA fuse for each group. It mounts on standard DIN EN rails and uses screw terminals for field connections. The FC designation identifies the conformal-coated version of the TSDI-16UNI family.

 

Key Technical Specifications

Parameter	Specification
Manufacturer	Honeywell
Model	FC-TSDI-16UNI
Product type	Safe digital input field termination assembly (FTA)
System family	Honeywell Safety Manager
Part number	3440741
Input channels	16
Channel arrangement	2 groups of 8
Supported input circuits	24/48 V DC and NAMUR, subject to compatible input hardware
Maximum voltage	50 V DC, overvoltage category III; 150 V DC, category II
Actual maximum voltage	Defined by the connected input module
Fuse rating	250 mA, slow-acting
Fuse size	5 × 20 mm
Maximum output current per fuse	175 mA
Mounting	DIN EN TS32 or TS35 × 7.5 rail
Rail length required	91 mm
Dimensions (L × W × H)	90 × 70 × 60 mm
Maximum wire size	2.5 mm² (AWG 14)
Wire strip length	7 mm
Terminal tightening torque	0.5 Nm
Coating	Conformal coated
Documented approvals	CE, TÜV, UL, CSA, FM

The maximum permitted field voltage depends on the connected input module. Verify the complete circuit design and the relevant Honeywell hardware reference before wiring.

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Engineering Selection Highlights

• 16 field input channels: Terminates multiple discrete field circuits through one compact assembly.
• Two protected channel groups: Separates the channels into two groups of eight, each with a shared positive supply protected by a 250 mA fuse.
• Universal input application: Supports compatible 24/48 V DC and NAMUR input circuits when paired with the appropriate Safety Manager input hardware.
• System interconnection: Interfaces screw-terminal field wiring with the Safety Manager input modules through a compatible SICC system interconnection cable.
• DIN-rail installation: Mounts on TS32 or TS35 × 7.5 DIN EN rails, simplifying cabinet integration.
• Conformal-coated construction: The FC variant is suitable when the specified system configuration calls for conformal-coated hardware.
• Defined terminal requirements: Wire size, stripping length, and tightening torque are specified to support consistent installation.
• Safety-system compatibility: Selection must account for the associated input module, field voltage, wiring arrangement, and approved Safety Manager configuration.

 

System Compatibility & Integration Requirements

The FC-TSDI-16UNI is a field termination assembly, not a standalone digital input processor. It provides the physical interface for field circuits and connects to compatible Safety Manager input hardware through a system interconnection cable.

Integration item	Requirement
Control platform	Honeywell Safety Manager
Input function	Safe digital input field termination
Supported circuits	Compatible 24/48 V DC or NAMUR circuits
System cable	Compatible SICC-0001/Lx cable
Input module	Compatible SDIL-1608 configuration, including redundant pairs where specified
Channel grouping	Two groups of eight
Fuse protection	250 mA slow-acting fuse per group
Mounting	TS32 or TS35 × 7.5 DIN EN rail
Field wiring	Screw terminals, maximum 2.5 mm² wire
Electrical limits	Confirm actual maximum voltage from the connected input module

Before installation, verify the exact input module, cable length and type, termination assembly revision, and field-device signal characteristics. Do not assume that another FTA with a similar channel count or voltage rating is interchangeable.

Dimensions, Mounting & Connection Notes

The FC-TSDI-16UNI measures 90 × 70 × 60 mm (L × W × H) and requires approximately 91 mm of DIN-rail length.

Installation requirements include:

• Mount the assembly on a compatible TS32 or TS35 × 7.5 DIN EN rail.
• Connect field wires to the designated screw terminals.
• Use wire up to 2.5 mm² (AWG 14).
• Strip approximately 7 mm of insulation from each conductor.
• Tighten terminals to the specified torque of 0.5 Nm.
• Verify the fuse type and rating before replacing a fuse.
• Confirm correct polarity and the intended grouping of the eight-channel circuits.
• Connect the assembly to the designated input hardware using the specified SICC cable.

Isolate the relevant power sources and follow the approved site safety procedures before changing field wiring or replacing the assembly.

 

Detailed Product Overview

Field Wiring and System Interface

The FC-TSDI-16UNI serves as the interface between external field wiring and the Safety Manager system interconnection cable. Field devices connect to screw terminals on the FTA, while a compatible SICC cable links the assembly to the designated input module.

This separation provides an organized field-wiring interface and allows the termination assembly to be installed on a DIN rail within the control cabinet.

Channel Grouping and Fuse Protection

The assembly provides 16 channels arranged in two groups of eight. Each group shares a common positive supply protected by a 250 mA slow-acting fuse.

The documented maximum output current per fuse is 175 mA. This value is important when evaluating the field-circuit supply and should not be confused with the fuse’s nominal 250 mA rating. The connected input module and system design define the permitted operating limits.

Supported Input Circuits

The TSDI-16UNI family is specified for compatible 24/48 V DC and NAMUR input circuits. The actual voltage limit is determined by the connected input module, even though the termination assembly documentation lists maximum voltage categories of 50 V DC for overvoltage category III and 150 V DC for category II.

Confirm the signal type and voltage requirements before connecting a field device. The assembly should not be treated as a universal interface for arbitrary AC or DC signals.

Mechanical Installation

The 90 × 70 × 60 mm assembly is designed for standard TS32 or TS35 × 7.5 DIN EN rails. The documented rail length requirement is 91 mm.

Correct terminal preparation is essential for secure connections. Honeywell’s listed requirements specify a maximum wire diameter corresponding to 2.5 mm² (AWG 14), a strip length of 7 mm, and a tightening torque of 0.5 Nm.

FC and FS Variant Differences

Honeywell identifies both FS-TSDI-16UNI and FC-TSDI-16UNI in the hardware reference. The FS variant is non-conformal-coated, while the FC variant is conformal-coated. The release documentation lists FC-TSDI-16UNI part number 3440741 and identifies its conformal-coated configuration.

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When replacing an installed assembly, match the complete model number and confirm whether the project requires the FC or FS version.

Replacement and Maintenance Guidance

Before procurement, record the existing model and part number, the associated input module, the SICC cable designation, and the field-circuit voltage. Confirm fuse ratings and the required terminal arrangement against the system drawings.

After installation, verify field polarity, fuse continuity, terminal tightness, input status, and the required end-to-end functional behavior. For safety-related applications, complete the prescribed verification and commissioning process before returning the system to service.

 

Applications & System Role

The FC-TSDI-16UNI is used to terminate discrete field signals for compatible Honeywell Safety Manager input systems.

Typical applications include:

• Safety interlock status monitoring.
• Emergency shutdown system input circuits.
• Field switch and contact-state acquisition.
• Process equipment permissive signals.
• NAMUR sensor interfaces.
• Industrial alarm and equipment-status monitoring.
• Maintenance and replacement of existing Safety Manager input termination assemblies.

The specific safety function depends on the connected input module, field-device characteristics, controller configuration, and validated application logic. The FTA alone does not determine the safety integrity level of the complete system.

 

Frequently Asked Questions

Q1: What is the HONEYWELL FC-TSDI-16UNI?

It is a conformal-coated, 16-channel safe digital input field termination assembly for Honeywell Safety Manager systems.

Q2: How many input channels does it provide?

It provides 16 channels arranged in two groups of eight.

Q3: Which input circuits does it support?

The TSDI-16UNI family supports compatible 24/48 V DC and NAMUR input circuits. Actual electrical limits depend on the connected input module.

Q4: What fuse does it use?

The documented rating is a 250 mA slow-acting fuse in a 5 × 20 mm package, with a maximum output current of 175 mA per fuse.

Q5: Which DIN rail does it fit?

It mounts on TS32 or TS35 × 7.5 DIN EN rails and requires approximately 91 mm of rail length.

Q6: What are its dimensions?

The assembly measures 90 × 70 × 60 mm (L × W × H).

Q7: How does it connect to the Safety Manager input module?

It connects field wiring through screw terminals and interfaces with compatible input hardware using a designated SICC system interconnection cable.

Q8: What is the difference between FC-TSDI-16UNI and FS-TSDI-16UNI?

The FC version is conformal-coated; the FS version is non-conformal-coated. Confirm the required variant and approved system compatibility before replacement.