ABB TU814V1 3BSE013233R1 Module Terminal Unit

The TU814V1 is a Compact Module Terminal Unit within the ABB Ability™ System 800xA® hardware portfolio. It serves as a passive interface component primarily designed for reliably connecting and routing field wiring to the system's I/O modules. Its core function is to provide an electrical interface for field devices such as sensors and actuators, safely and accurately transmitting their signals to the corresponding I/O modules via its built-in part of the ModuleBus, thereby integrating them into the higher-level control system.

As a crucial interface component in industrial automation control systems, the TU814V1 acts as a bridge in various sectors including process control, factory automation, and machinery manufacturing. With its compact mechanical design, flexible configuration capabilities, highly reliable connection performance, and broad compatibility, it significantly simplifies system wiring, module installation, and maintenance, enhancing the engineering efficiency and long-term operational stability of the entire control system.

2. Key Features and Benefits

1. High-Density Channels & Flexible Configuration: A single TU814V1 supports up to 16 I/O channels, meeting the access requirements for medium-scale signal points. The channels are divided into two electrically isolated groups of 8 channels each, with independent voltage supervision for each group. This enhances system noise immunity and safety, facilitating group-based power supply and maintenance.

2. Mechanical Key Configuration System: The product features two six-position mechanical keys, providing a total of 36 different mechanical configuration combinations. This design allows the same MTU model to be easily adapted, through simple mechanical setting, to various types of ABB System 800xA I/O modules (e.g., AI, DI, DO, AO). This configuration is purely for physical orientation and does not affect the electrical functionality of the MTU or the I/O module, greatly improving hardware versatility and simplifying spare parts management.

3. Modular & Easy Maintenance Design:

• Removable Terminal Board: The upper part of the MTU (terminal board) can be detached and replaced even while the system is operational. This allows for maintenance, such as replacing a damaged terminal screw, without requiring a system shutdown, maximizing uptime.

• Crimp Snap-in Connections: Three rows of crimp snap-in connectors are provided for field signals and process power connections. Using pre-fitted crimp terminals, wiring can be completed before shipment. On-site, connections are made simply by plugging in or unplugging the connector blocks, drastically reducing on-site wiring errors and time, and supporting a "pre-assembly" workflow.

• Mechanical Locking Mechanism: A built-in locking mechanism securely locks the I/O module in its correct position. Simultaneously, it sends a "BLOCK" signal to the module, ensuring the module remains in its initialization state until fully locked, preventing misoperation.

4. Convenient Mounting: Supports mounting on standard DIN rails and includes a mechanical latch that can be easily engaged, locked, or released using a screwdriver, enabling rapid deployment within industrial cabinets.

5. Reliable Electrical & Safety Characteristics:

• High Electrical Ratings: Maximum rated continuous current per I/O channel is 2A, and per process voltage connection point (L+) is 5A. Maximum rated voltage is 50V DC, meeting the needs of most 24V DC industrial field devices.

• Strong Insulation & Withstand Voltage: Rated insulation voltage is 50V, with a dielectric withstand test voltage of 500V AC, ensuring excellent electrical isolation.

• Comprehensive Protection & Certifications: Features IP20 protection rating and complies with Equipment Class I (earth protected) per IEC 61140. The product holds CE, cULus (for Class I Div 2 / Zone 2 hazardous locations), ATEX Zone 2, and several marine certifications (ABS, BV, DNV-GL, LR), making it suitable for demanding industrial and marine environments.

6. Wide Compatibility: Designed specifically for use with the extensive range of ABB System 800xA I/O modules. The compatibility list includes dozens of analog and digital I/O modules such as AI810, AI815, DI810, DI814, DO810, DO815, AO810, AO815, etc., offering users great flexibility in system construction.

3. Application Scenarios

The TU814V1 MTU, as a key interface for the ABB System 800xA distributed I/O system, is widely used in:

• Process Industries: Continuous and batch process control in oil & gas, chemical, pharmaceutical, water treatment, etc.

• Manufacturing: Automation lines in automotive, food & beverage, packaging, metallurgy, etc.

• Energy Sector: Monitoring and control in power plants (thermal, hydro, renewable) and transmission/distribution systems.

• Marine & Shipping: Suitable for ship control systems, complying with multiple marine certifications.

• Infrastructure: Monitoring systems for building automation, airports, tunnels, etc.

Its primary role is to centrally and systematically connect various field signals—digital (e.g., push buttons, limit switches, relay contacts) and analog (e.g., 4-20mA transmitters, thermocouples, RTDs)—and provide control output interfaces for actuators (e.g., valves, motor starters).

4. Working Principle & Signal Distribution

The TU814V1 serves a dual role as a "junction box" and a "bus repeater":

1. Field Signal Distribution: Through its three rows (A, B, C) of crimp connectors (corresponding to connection table X1 in the document), it systematically brings field device power (L1+, L2+), common references (L1-, L2-), and signal wires (e.g., A1, 2, 3...) into the system. The two isolated group design allows for independent reference grounds for different signal types or supply zones, reducing common-mode interference.

2. ModuleBus Distribution & Address Generation: The MTU internally carries part of the ModuleBus that connects to the higher-level controller or communication module. It not only distributes ModuleBus signals (and power) to the I/O module mounted on it but also cascades these signals to the next MTU in line, enabling serial expansion of multiple MTUs. Furthermore, the MTU features address shifting functionality. Based on its physical position on the backplane, it generates the correct logical address for the connected I/O module, typically via position signals on the backplane connectors, simplifying system address configuration.

5. Installation, Wiring & Configuration Guide

1. Mounting:

• Snap the MTU onto a standard 35mm DIN rail.

• Use a screwdriver to engage the bottom latch, securely locking the MTU to the rail.

2. Mechanical Key Configuration:

• According to the I/O module model to be installed, set the positions of the two mechanical keys by referring to the hardware manual. Use a small screwdriver to rotate the dial on each key to the specified position. This step must be completed before installing the I/O module.

3. Wiring:

• Pre-assembly (Recommended): In the workshop or during preparation, use the appropriate crimping tool to attach field cables to the matching crimp terminals (e.g., Phoenix 1808890 series) according to the wiring diagram.

• On-site Connection: Insert the pre-crimped cables into the corresponding row and position (A, B, C rows, positions 1-10) of the X1 connector on the MTU as per the connection diagram (e.g., Figure 216 and Table 113 in the document). A click indicates proper locking. This pluggable design facilitates maintenance and replacement.

• Process Power: Connect the system-provided 24V DC process power positive (L+) to the designated L1+/L2+ terminals, and the negative (0V) to the corresponding L1- and L2- terminal groups.

4. Module Installation & Locking:

• Align the corresponding ABB I/O module with the MTU's guide rails and connector slots and insert it.

• Firmly push the module down until its base is fully seated against the MTU.

• Use a screwdriver or manually (depending on design) operate the module locking mechanism on the MTU to mechanically lock the I/O module. The module then receives the "BLOCK" release signal and enters normal operation.