Description
Honeywell DC-TUIO31 Universal I/O Termination Assembly
Product Overview
The Honeywell DC-TUIO31 is a non-redundant Universal I/O Termination Assembly (IOTA) used with Honeywell Experion Series C control-system hardware. Honeywell documentation identifies DC-TUIO31 as one of the supported IOTA models for the CC-PUIO31 Universal Process I/O module, with the DC-TUIO31 designated as the non-redundant 9-inch configuration. The termination assembly provides the physical field-wiring interface for the universal I/O architecture rather than functioning as the primary I/O processing electronics itself.
The Honeywell DC-TUIO31 is associated with the UIO-2 architecture, where channels can be configured for different signal functions according to the connected I/O module and control-system configuration. The associated CC-PUIO31 supports analog input, analog output, digital input, digital output, and pulse-input functions, allowing one universal I/O architecture to accommodate mixed process signals. Honeywell documentation also identifies HART 7 support for analog I/O, open-wire detection, electronic short-circuit protection, fast scanning, and configurable safe-state behavior for applicable output channels.
For maintenance and procurement purposes, the Honeywell DC-TUIO31 should be treated as an IOTA/termination assembly rather than simply an interchangeable analog or digital I/O module. The distinction matters when replacing hardware: the DC-TUIO31 must be matched to the correct UIO-2 electronics, carrier arrangement, redundancy configuration, wiring scheme, and system revision. Honeywell’s documentation explicitly distinguishes DC-TUIO31 from the redundant DC-TUIO41, so the redundancy requirement should be checked before ordering.
Product Introduction
The DC-TUIO31 belongs to Honeywell’s Universal I/O architecture for Experion Series C systems. Its primary purpose is to provide the termination and connection interface between field wiring and the associated universal I/O electronics.
Unlike a dedicated analog-input termination assembly, the UIO-2 architecture allows the connected channel functionality to be selected according to the system configuration. This is useful in projects where field signal assignments may change during engineering or where a single cabinet design needs to accommodate several signal types.
Honeywell documentation lists DC-TUIO31 and DC-TUIO41 as IOTA options for the CC-PUIO31 UIO-2 module, with DC-TUIO31 specified for the non-redundant 9-inch arrangement.
Main Features and Advantages
Universal I/O Architecture
The most important characteristic of the DC-TUIO31 is its role in Honeywell’s UIO-2 architecture. The associated CC-PUIO31 can support multiple channel functions, including analog input, analog output, digital input, digital output, and pulse input. Any four channels can be configured for pulse input according to the published specification.
This arrangement can reduce the number of dedicated I/O termination designs required within a project. It also gives engineering teams greater flexibility when the final signal schedule is still being developed.
DC-TUIO31
32-Channel System Architecture
The UIO-2 system is specified for up to 32 channels per module. For analog-input configurations, Honeywell documentation specifies current inputs from 0–20 mA or 4–20 mA, with 16-bit A/D conversion and a nominal 250-ohm input impedance. The published analog-input scan rate is 10 ms.
These specifications apply to the associated universal I/O electronics rather than meaning that the DC-TUIO31 itself is a 32-channel analog input card. This distinction is important when preparing a replacement bill of materials.
HART and Diagnostic Functions
The associated UIO-2 electronics support HART 7 for applicable analog I/O configurations. The architecture also provides open-wire detection and electronic short-circuit protection. These functions can assist commissioning and maintenance personnel in identifying field-loop problems without immediately replacing hardware.
Non-Redundant Configuration
DC-TUIO31 is specifically identified as the non-redundant 9-inch IOTA for the CC-PUIO31. Honeywell also lists DC-TUIO41 as the redundant alternative. A replacement order should therefore confirm whether the existing cabinet is designed for non-redundant or redundant operation.
Procurement and Replacement Considerations
Do not substitute DC-TUIO31 solely because another termination assembly has a similar connector or physical appearance. Verify the associated I/O module, IOTA model, cabinet wiring, system revision, channel configuration, and redundancy architecture.
For used or refurbished hardware, practical acceptance testing should include connector inspection, terminal integrity, identification-label verification, correct mating with the intended I/O hardware, and representative channel testing where the assembly is being supplied as part of a complete I/O interface.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | DC-TUIO31 |
| Part Number | 51307772-176 |
| Product Type | Universal I/O Termination Assembly (IOTA) |
| I/O Architecture | UIO-2 |
| Associated I/O Module | CC-PUIO31 |
| Configuration | Non-redundant |
| IOTA Size | 9-inch |
| Channel Capacity | Up to 32 channels within associated UIO-2 architecture |
| Supported Signal Functions | AI, AO, DI, DO, Pulse Input* |
| HART | HART 7 supported by associated UIO-2 electronics for applicable analog I/O |
| Analog Input Range* | 0–20 mA / 4–20 mA |
| A/D Resolution* | 16 bit |
| Analog Input Impedance* | 250 Ω nominal |
| Analog Input Scan Rate* | 10 ms |
| Pulse Input Channels* | Any 4 channels |
| Pulse Frequency* | 0–15 kHz |
| Minimum Pulse Width* | 25 µs |
| System Application | Honeywell Experion Series C / Experion PKS |
| Redundant Alternative | DC-TUIO41 |
| Operating Temperature* | Associated UIO-2 module specified for -40 to +70°C ambient |
*These specifications describe the associated CC-PUIO31/Universal I/O architecture, not independent electrical characteristics of the passive termination assembly itself. Honeywell documentation identifies DC-TUIO31 as the IOTA used with CC-PUIO31.
Related Products
- Honeywell CC-PUIO31 Universal Process I/O Module
- Honeywell DC-TUIO41 Redundant Universal I/O Termination Assembly
- Honeywell CC-TUIO31 Universal I/O Termination Assembly
- Honeywell CC-TUIO41 Redundant Universal I/O Termination Assembly
- Honeywell Experion Series C I/O hardware
Frequently Asked Questions
What is Honeywell DC-TUIO31?
DC-TUIO31 is a non-redundant Universal I/O Termination Assembly used with Honeywell’s UIO-2 architecture in Experion Series C systems. Honeywell documentation specifically associates it with the CC-PUIO31 Universal Process I/O module.
What is the part number for DC-TUIO31?
The commonly referenced part number is 51307772-176. The complete assembly label should be checked before procurement because Honeywell hardware can have revision and configuration identifiers.
Is DC-TUIO31 an analog input module?
No. It is better described as an I/O termination assembly (IOTA). The associated CC-PUIO31 provides the universal I/O functionality, with channels configurable for several signal types.
How many channels does the UIO-2 system support?
The associated CC-PUIO31 is specified for up to 32 channels per module. Individual channel functionality depends on the system configuration.
Is DC-TUIO31 redundant?
No. Honeywell identifies DC-TUIO31 as the non-redundant 9-inch IOTA. DC-TUIO41 is listed for the redundant configuration.
Does the UIO-2 architecture support HART?
Yes. Honeywell documentation specifies HART 7 support for applicable analog I/O configurations and identifies a HART modem per channel for fast-performance applications.
What should be checked before replacing DC-TUIO31?
Confirm the complete part number, IOTA type, CC-PUIO31 compatibility, non-redundant cabinet architecture, connector arrangement, wiring, system revision, and channel configuration. Do not use the redundant DC-TUIO41 as a direct substitute without confirming the cabinet design.
