1. Product Overview

Brand / Series / Positioning

• Brand: Honeywell

• Series: Safe Digital Input / Field Termination Assembly (FTA) modules

• Positioning: The FC‑TSDI‑16UNI is a universal (multi‑type) safe digital input FTA module. Its role is to bridge field discrete signals (switches, sensors, contacts) of varying types (dry contact, voltage, current, NAMUR) into a safety logic system, providing protection, isolation, fusing, and signal conditioning in safety instrumented systems (SIS).

It sits between field wiring and the safety controller, ensuring that signals arrive reliably and safely, handling faults, overvoltage, grouping, fusing, and isolation. Used in industries requiring high safety integrity, such as oil & gas, petrochemical, power, refining, etc.

2. Technical Specifications

Below is a summary table of specifications for FC‑TSDI‑16UNI, based on available product listings and technical sources. (Actual datasheet should be consulted for final design.)

3. Product Description & Features

The FC‑TSDI‑16UNI is a universal safe digital input field termination assembly (FTA). Its main purpose is to accept discrete signals from the field—such as switches, relay contacts, NAMUR sensors, DC voltage signals—and provide a protected, fused, isolated, conditioned path into the safety control system.

Key features include:

• Universal Input Capability: Accepts dry contact, voltage, current, and NAMUR type discrete signals.

• Fused Groups: The 16 channels are divided into two groups of 8, each group’s positive supply line fused (250 mA) to prevent a fault in one channel from affecting the rest.

• Overvoltage / Fault Protection: Designed to handle overvoltage conditions (50 V / 150 V limits), protecting against wiring errors and surges.

• Isolation & Safety Integrity: Maintains signal separation, channel protection, and safe handling in a safety I/O architecture.

• Compact Form Factor: Fits on DIN rail, with snap‑in mounting and minimal footprint (90 × 70 × 60 mm).

• Robust Field Termination: Screw terminals with standard wiring specs make field installation easier and secure.

• Integration with Safety System: It interfaces with system interconnect cable (SICC‑0001/Lx) and works with complementary modules like SDIL‑1608 or safety controllers.

• Diagnostic / Fault Awareness: When a channel or fuse fault occurs, the system can detect input failures (e.g. open circuit, short circuit) and flag them in the safety logic.

In essence, FC‑TSDI‑16UNI sits at the boundary between field wiring and the safety logic domain, providing safe, robust digital input reception.

4. Applications

Typical usage scenarios include:

• Safety Instrumented Systems (SIS): As part of ESD (emergency shutdown), Fire & Gas, Burner Management, or Safety loops—monitoring discrete inputs such as emergency stops, safety interlocks, limit switches.

• Plant Safety Logic: Monitoring field detection devices (level switches, pressure switches, flow switches) used as safe inputs.

• Redundant / Fault-tolerant Control Architectures: The fusing, grouping, and fault isolation features support designs requiring high availability and safety integrity.

• Process Control Integration: Bridging digital signals from the field to the safety or control system in process industries (petrochemical, refining, power plants, etc.).

• Retrofit / Upgrades in Automated Plants: Can replace older discrete I/O modules to introduce safety diagnostics, improved protection, or better integration.

The universality of input types allows FC‑TSDI‑16UNI to be used in varied applications where the signal types may differ (dry contact, voltage, NAMUR), without needing a separate module per signal type.

5. Advantages

Here are primary advantages of FC‑TSDI‑16UNI:

• Versatility in Input Type: Supports multiple discrete signal types without needing different modules for each.

• Fault Containment: Fusing groups help isolate a fault to a limited set of channels, preventing system-wide impact.

• Compact & Efficient Design: Small footprint with snap-in DIN rail mounting saves space in enclosures.

• Enhanced Safety / Protection: Overvoltage design, fused groups, isolation give robust protection against wiring errors, surges, and faults.

• Ease of Field Wiring: Screw terminals, standard wiring practices (max wire size, torque, strip length) make installation straightforward.

• Diagnostic Capabilities: Fault detection, input failure awareness, channel-level reliability.

• Seamless System Integration: Works cleanly with safety logic / I/O systems, with designed interface to interconnect cables.

• Reliability in Harsh Environments: Designed for industrial ambient conditions, with protective design practices.

These advantages make FC‑TSDI‑16UNI a strong choice when you need a universal, robust, safety‑grade digital input termination module.

6. Related Models (Same Series or Similar Function)

Here are 5 models that are in the same family (safe digital input FTAs) or complement with related I/O functions:

These modules often coexist in safety I/O architectures: TSDI types for inputs, TSDO types for outputs, TSAO for analog output, etc.

7. Popular Modules from Same Brand

Here are 5 well-known modules from Honeywell’s I/O / safety / control portfolio: