Description

ABB TU818 – Advanced Industrial PLC Terminal Unit Module Comprehensive Technical Guide

Product Description

Product Parameters

Advantages and Features

1. High-Density Secure Termination: ABB TU818 features 48 tinned copper terminals with anti-loosening lock washers, ensuring rock-solid connections that resist corrosion and industrial vibration, eliminating signal loss and costly downtime caused by loose wiring.
2. Enhanced Load-Bearing Capacity: With an 18A maximum current per terminal and support for up to 3mm² wire cross-section, the module handles mid-to-high power control lines and dense signal wiring, replacing multiple low-capacity terminal units and streamlining system architecture.
3. Multi-Layer Integrated Protection: Built-in 2.2kV surge protection shields connected PLC and I/O modules from voltage transients, while the UL94 V-0 rated flame-retardant housing and short-circuit resistant terminals enhance safety in high-risk industrial environments.
4. Seamless Cross-System Compatibility: Tailored for ABB’s core automation modules and compatible with third-party PLC equipment, ABB TU818 offers flexibility for both new installations and legacy system retrofits, reducing compatibility issues and installation time.
5. Maintenance-Friendly Design: The triple-row terminal layout with color-coded labeling and accessible wiring ports simplifies wire tracing, module replacement, and system expansions, cutting maintenance time by up to 30% compared to conventional terminal units.

Application Cases in Application Fields

1. Petrochemical Hydrocracking Unit Control Cabinets: A large petrochemical plant in North America deployed ABB TU818 in its hydrocracking unit control cabinets. The module terminated signals for pressure transmitters, catalyst injectors, and safety interlocks, withstanding high-temperature and corrosive environments, reducing wiring-related failures by 42% and ensuring compliance with strict industrial safety regulations.
2. Steel Mill Continuous Casting Line Control Panels: A leading European steel mill adopted ABB TU818 for its continuous casting line control panels. The module handled wiring for temperature sensors, roller speed controls, and cooling system actuators, its high current capacity supporting heavy-duty equipment lines and its rugged design maintaining stability amid intense vibration.
3. Municipal Waste Incineration Plant Automation Systems: A major Asian municipal waste incineration plant integrated ABB TU818 into its flue gas treatment control systems. The module’s surge protection safeguarded equipment against power grid fluctuations, while its organized terminal layout simplified maintenance in the dusty, high-temperature environment, ensuring consistent compliance with environmental emission standards.

Comparisons with Competing Products

Selection Suggestions and Precautions

Selection Suggestions

1. Large-Scale ABB Automation Projects: Prioritize ABB TU818 for projects using ABB AC 800M series PLCs or 800xA systems, as its native compatibility ensures seamless integration and avoids the need for third-party adapters.
2. High-Density & High-Current Wiring Needs: Choose this module for complex control systems (e.g., petrochemical plants, steel mills) that require dense terminal layout and mid-to-high current capacity, where standard terminal units may be insufficient.
3. Harsh Industrial Environments: Opt for ABB TU818 for control cabinets in high-vibration, high-temperature, or corrosive environments, thanks to its anti-corrosion terminals, surge protection, and reinforced housing.

Precautions

1. Installation: Mount the module on standard 35mm DIN rails in a dry, dust-free control cabinet; ensure the galvanized steel mounting bracket is fully locked to prevent displacement, and maintain a 10mm gap from adjacent heat-generating components for optimal heat dissipation.
2. Wiring Safety: Use wires within the specified cross-section range (0.5mm² – 3mm²) and torque terminal screws to 1.1-1.4 N·m—over-tightening may damage terminal threads, while under-tightening can lead to loose connections and arcing.
3. Protection Maintenance: Periodically inspect the built-in surge protection varistors for signs of damage (discoloration, cracking) and replace the module if compromised; clean terminals with a dry cloth regularly to remove dust and prevent corrosion.
4. Storage: Store unused ABB TU818 modules in a cool, dry environment with a temperature range of -10°C to +45°C and relative humidity below 75%, keeping them in the original anti-static packaging to protect terminals and housing from mechanical damage.

TU818