Honeywell DC-TUIO31 Non-Redundant Universal I/O IOTA

The Honeywell DC-TUIO31, also cataloged as the TUIO31 Non-Redundant Universal Input/Output Termination Assembly, operates as a dedicated hardware component for routing and terminating field wiring signals to the Universal Input/Output Module (UIOM) within Experion PKS Series C platforms.

Hardware Specifications

Process Control Integration & Channel Isolation

• 4-20 mA HART Loop Protocol Execution: Each of the 32 channels is equipped with routing paths supporting the pass-through of the 4-20 mA HART loop protocol, enabling bi-directional diagnostic data communication between intelligent field transmitters and the controller backplane.
• 1500 V Channel-to-Channel Isolation Protection: The internal circuit layout provides robust 1500 V channel-to-channel isolation. This isolates electrical noise and prevents ground loop currents from degrading measurement accuracy or damaging adjacent analog input lines.
• Software-Configurable Signal Adaptation: Eliminates the need for physical jumper selection on the assembly board. Channel configuration for inputs (AI/DI) or outputs (AO/DO) is achieved strictly via system software, preventing diagnostic configuration faults on the physical loop.

Frequently Asked Questions

Q: Can a Universal Input Output Module (UIOM) be safely hot-swapped on the DC-TUIO31 assembly during live operation?

A: Yes. The physical design of the DC-TUIO31 allows the active controller module to be inserted or removed without interrupting power or signal connections to the remaining nodes. Field termination wiring remains fully undisturbed during the exchange.

Q: Does the DC-TUIO31 support dual-redundant module installations?

A: No. The DC-TUIO31 is a 9-inch non-redundant base board. It only supports a single active UIOM card. For redundant, dual-module operations, a 12-inch redundant IOTA (CC-TUIO41) must be deployed.

Q: What is the operational distinction of the "DC-" prefix compared to the "CC-" prefix?

A: The "DC-" prefix indicates that this IOTA is an uncoated module intended for clean, environmentally controlled control rooms. For high-humidity, corrosive, or salt-laden industrial atmospheres, the conformal coated version (CC-TUIO31) must be used.

Field Installation Guidelines

• DIN-Rail Assembly Mounting: Securely mount the IOTA on a standard 35 mm DIN rail. Ensure both grounding clips of the assembly are in direct mechanical contact with the bare metal of the DIN rail to establish chassis ground.
• Field Shield Grounding: Connect all field cable shielding lines directly to the dedicated copper earth bar at the base of the cabinet. Do not tie shield wires together inside the IOTA terminal strip.
• Wire Gage and Termination Torque: Terminate field wiring using wire sizes between 0.2 mm square and 2.5 mm square (24 to 12 AWG). Tighten terminal block screws to a maximum torque of 0.5 Nm to prevent thread damage.
• Separation of Signal Classes: Run low-voltage analog and digital signals in dedicated cable ducts isolated from high-voltage AC power lines by a minimum of 300 mm.