Honeywell CC-TUIO31 32-Point UIO-2 IOTA

Key Technical Specifications

Honeywell specifies CC-TUIO31 as the non-redundant 9-in IOTA, while CC-TUIO41 is the 12-in redundant IOTA. The associated CC-PUIO31 provides 32 universal I/O points and supports analog, digital, and pulse functions, with HART 7 capability.

Part-number caution: Some aftermarket listings associate CC-TUIO31 with additional hardware numbers such as 51306875-176. Do not assume every CC-TUIO31 listing has the same suffix or revision. Match the label on the installed assembly against the purchasing specification before ordering.

Product Introduction

Honeywell CC-TUIO31 is a Series C UIO-2 non-redundant IOTA used with the CC-PUIO31 Universal I/O module in Experion PKS installations. It provides the physical field termination and interface for one 32-point UIO-2 module. Honeywell specifies a 9-in (229 mm) IOTA footprint.

The key replacement issue is identification: CC-TUIO31 is the IOTA, not the CC-PUIO31 I/O electronics module. For redundant UIO-2 installations, Honeywell specifies CC-TUIO41 instead. Verify the installed cabinet arrangement before ordering either part.

CC-TUIO31

CC-TUIO31

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation — Approximately 5–10 Minutes

⚠️ Safety First: Notify operations, place the affected process in the approved safe state, and follow the site’s lockout/tagout procedure. Do not remove the IOTA from an energized installation unless the applicable Honeywell documentation and site procedure explicitly permit it.

Tools Required:

• ESD wrist strap
• Appropriate Phillips screwdriver
• Digital multimeter
• Wire labels
• Smartphone or camera
• Current Experion PKS cabinet/I/O drawings

Data Backup and Identification

1. Confirm the exact model: CC-.
2. Confirm that the cabinet uses the non-redundant UIO-2 arrangement.
3. Verify that the associated I/O module is .
4. Photograph the complete installed assembly.
5. Photograph TB1, TB2, TB3, connectors, and field wiring.
6. Record the existing module and IOTA labels, including suffixes and date codes.
7. Record the channel assignments in the Experion engineering database.
8. Keep the old hardware available until commissioning is complete.

Honeywell documentation states that the non-redundant IOTA accommodates one module; the redundant configuration uses two modules on the larger CC-TUIO41 IOTA.

Stage 2: Removing the Old IOTA — Approximately 5 Minutes

1. Place the affected process in the approved maintenance state.
2. Isolate power according to the site procedure.
3. Remove the cabinet cover or access hardware as required.
4. Label every field conductor before disconnecting it.
5. Photograph each terminal group and connector.
6. Disconnect the field wiring without pulling on the conductors.
7. Release the applicable mounting hardware.
8. Remove the CC- carefully without forcing the mating connectors.
9. Inspect the mating interface for bent contacts, contamination, or physical damage.
10. Inspect the surrounding wiring and terminal blocks.

⚠️ Keep the old IOTA until the replacement has passed functional checks. It provides a direct physical reference if a wiring question appears during commissioning.

Stage 3: Installing the New CC- — Approximately 5–10 Minutes

1. Verify that the replacement label reads CC-.
2. Confirm the physical assembly is the 9-in non-redundant configuration.
3. Verify compatibility with the installed module.
4. Attach an ESD wrist strap before handling the associated electronic hardware.
5. Position the IOTA according to the cabinet drawing.
6. Seat the assembly without forcing connectors or mounting hardware.
7. Secure the IOTA using the specified cabinet hardware.
8. Reconnect TB1/TB2/TB3 and other applicable wiring according to the original documentation.
9. Check every conductor against the photographs and engineering drawings.
10. Verify that no wire is loose, pinched, or incorrectly landed.

Self-Checklist:

• CC- model confirmed
• Non-redundant configuration confirmed
• CC- compatibility confirmed
• Terminal wiring verified
• Connectors fully seated
• Mounting hardware secured
• No damaged contacts
• ESD precautions followed

Stage 4: Power-On & Testing — Approximately 10–15 Minutes

1. Perform a complete wiring inspection before energizing the system.
2. Verify the applicable cabinet supply conditions against the engineering documentation.
3. Energize the affected hardware using the approved startup procedure.
4. Check the associated module status indicators.
5. Connect to the Experion engineering environment.
6. Verify that the expected hardware is detected.
7. Confirm the configured channel assignments.
8. Test representative analog and digital points.
9. Verify signal scaling, status, alarms, and output behavior.
10. Return the process to normal control only after the I/O checks pass.

⚠️ If the assembly is not recognized, do not immediately condemn the IOTA. Check the CC-/IOTA pairing, connector seating, cabinet position, wiring, and Experion configuration first.

Honeywell’s technical documentation shows CC- paired with either CC- or CC-TUIO41 and documents the relevant field-wiring arrangements.

Frequently Asked Questions (FAQ)

Q1. Is Honeywell CC- the same thing as CC-?

No. This is an important purchasing distinction.

CC- is the non-redundant IOTA. CC- is the Universal I/O module that mounts to the IOTA. Honeywell lists them as separate components in the UPC architecture.

Q2. How many I/O points does the CC- support?

The CC- arrangement is specified for 32 UIO points when used with the CC- Universal I/O module. The module can configure channels for analog input, analog output, digital input, digital output, and pulse input functions.

Q3. What is the difference between CC- and CC-TUIO41?

CC- is the 9-in non-redundant IOTA. CC- is the 12-in redundant IOTA. Honeywell’s documentation describes the redundant arrangement as mounting two modules on one redundant IOTA.

Q4. Can CC- be used as a direct replacement for an older Honeywell IOTA?

Compatibility depends on the installed Series C architecture and Experion release. Honeywell’s 2026 System Hints documentation identifies CC- / CC- / CC- as the recommended replacement family for the earlier CC-PUIO01 / CC-TUIO01 / CC-TUIO11 family when using Experion R432 and above. Verify the actual Experion release and cabinet configuration before making a migration decision.

Q5. Is CC- redundant?

No. CC- is specifically the non-redundant IOTA. If the application requires redundant hardware, Honeywell identifies CC- as the corresponding redundant IOTA.

Q6. Can I hot-swap CC-?

Do not assume that it is hot-swappable. CC- is part of the cabinet-level UIO termination architecture, and the permitted replacement procedure depends on the specific Experion/UPC installation. Unless the applicable Honeywell documentation explicitly permits energized replacement for your configuration, isolate the equipment before removal.

Q7. What condition should I specify when buying a replacement?

Specify the required condition explicitly: New Original, New Surplus, or Refurbished and Tested. Also request photographs of the actual label, including the full part number, revision/date code, and condition. Some aftermarket listings identify different secondary part numbers against CC-, so relying on the base model alone can create an avoidable identification error.