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ABB TU508-ETH S500 Interface Terminal Unit

1. Product Description

The ABB TU508-ETH S500 is a dedicated interface terminal unit designed for ABB S500 series industrial control systems, serving as a critical bridge between S500 controllers (e.g., S500 PLCs) and Ethernet-enabled field devices or upper-level monitoring systems. Unlike standard terminal units, it integrates Ethernet communication functionality with traditional signal 转接 capabilities, enabling both analog/digital signal wiring management and Ethernet data transmission in a single compact device.

As a core connection component in S500-based automation networks, the TU508-ETH S500 provides standardized terminal blocks for secure wiring of field sensor/actuator signals, while its built-in Ethernet port (RJ45) facilitates data exchange between the S500 controller and Ethernet devices (e.g., HMIs, SCADA systems, remote I/O modules). It features industrial-grade insulation, anti-interference circuitry, and a rugged DIN rail-mounted design, ensuring stable operation in harsh industrial environments with electromagnetic interference (EMI), temperature fluctuations, or mechanical vibration. Widely applied in manufacturing, energy, and infrastructure projects, it simplifies S500 system wiring, enhances Ethernet connectivity, and improves overall system maintainability.

2. Detailed Parameters

Parameter Category	Specifications
Model Number	TU508-ETH S500
Product Type	Interface Terminal Unit (with Ethernet communication function)
Terminal Configuration	16 screw-type terminals (8 pairs for analog/digital signal wiring; 2 dedicated terminals for power input)
Ethernet Interface	1 × 10/100 Mbps RJ45 port (auto-negotiation; supports full/half duplex)
Supported Ethernet Protocols	Modbus TCP/IP (client/server), Ethernet/IP (compatible with S500 system protocol)
Signal Compatibility	Analog signals: 4-20 mA, 0-10 V; Digital signals: 24 V DC (PNP/NPN)
Rated Voltage	Signal terminals: 300 V AC/DC; Power terminals: 24 V DC (19.2-28.8 V DC)
Rated Current	10 A per signal terminal (continuous); 2 A for Ethernet module power
Conductor Size	0.2-2.5 mm² (solid/stranded copper wire; ferrule recommended for stranded wire ≥1.0 mm²)
Insulation Material	Polyamide 66 (PA66), flame-retardant (UL94 V-0), corrosion-resistant
Operating Temperature	-40℃ to +70℃
Storage Temperature	-40℃ to +85℃
Dimensions (W×H×D)	48.3 mm × 105 mm × 62 mm (compatible with standard DIN rail)
Mounting Method	DIN rail mounting (35 mm standard rail, EN 50022)
Compatibility	ABB S500 series controllers (e.g., S500 PLC), S500 remote I/O modules, Ethernet HMIs/SCADA
Protection Class	IP20 (when installed in a closed control cabinet)
Certification	IEC 61000-6-2 (EMC immunity), IEC 60947-1 (industrial safety), IEEE 802.3 (Ethernet), CE, UL

3. Advantages & Features

Integrated Ethernet & Signal Wiring Functionality

Combines traditional terminal unit signal 转接 with 10/100 Mbps Ethernet communication, eliminating the need for separate Ethernet adapters or terminal blocks. This integration simplifies S500 system architecture, reduces control cabinet space usage by up to 30%, and lowers overall deployment costs.

Multi-Protocol Ethernet Compatibility

Supports Modbus TCP/IP and Ethernet/IP protocols, enabling seamless connectivity with S500 controllers, third-party Ethernet HMIs (e.g., ABB Panel 800), and SCADA systems. The auto-negotiation Ethernet port adapts to 10/100 Mbps networks, ensuring flexible integration with existing industrial Ethernet infrastructures.

Industrial-Grade Signal Reliability

PA66 flame-retardant insulation (UL94 V-0) and 300 V AC/DC rated signal terminals ensure safe signal transmission, while built-in EMI filters suppress interference from nearby high-power equipment (motors, inverters). This prevents signal distortion for analog/digital signals, maintaining ±0.1% accuracy for 4-20 mA analog signals—critical for precise process control.

Easy Installation & Maintenance

Standardized screw-type terminals with clear numbering enable quick wiring identification; the compact DIN rail design allows side-by-side mounting with S500 modules. The Ethernet port features a locking mechanism (optional) to prevent accidental disconnection, and the terminal cover can be removed without tools for wiring adjustments, reducing maintenance time.

Wide Environmental Adaptability

-40℃ to +70℃ operating temperature range withstands extreme industrial conditions, from freezing outdoor substations to high-temperature manufacturing workshops. Vibration resistance (IEC 60068-2-6) ensures stable performance in mobile equipment (e.g., on-site process skids) or vibrating production lines.

4. Application Fields

S500-Based Manufacturing Automation

Used in automotive, electronics, and machinery factories to connect S500 PLCs with Ethernet-enabled sensors (e.g., vision inspection cameras), VFDs (via Modbus TCP/IP), and analog actuators (e.g., control valves). The terminal unit manages both digital I/O signals and Ethernet data, enabling real-time production line monitoring and control.

Energy & Power Auxiliary Systems

Deployed in solar power plants, wind farms, or thermal power auxiliary systems to link S500 controllers with Ethernet-connected power meters (Modbus TCP/IP) and analog temperature/pressure sensors. It facilitates data transmission between local S500 systems and central SCADA, supporting efficient energy management and equipment monitoring.

Water & Wastewater Treatment

Integrates with S500 process controllers to manage 4-20 mA signals from water quality sensors (pH, dissolved oxygen) and 24 V DC digital signals from pump status switches. The Ethernet port connects to remote SCADA systems, enabling centralized monitoring of treatment processes and remote adjustment of chemical dosing pumps.

Building Automation with S500 Controllers

Applied in commercial buildings or industrial facilities to connect S500 HVAC controllers with Ethernet-based BMS (Building Management Systems) and analog/digital signals from HVAC equipment (temperature sensors, fan speed controllers). It streamlines building energy control, reducing energy consumption by up to 15% via optimized HVAC operation.

S500 Legacy System Upgrades

Acts as an Ethernet interface for older S500 systems lacking native Ethernet connectivity, enabling integration with modern Ethernet HMIs or cloud-based monitoring platforms. This extends the lifespan of S500 controllers while adding advanced connectivity features, avoiding costly full-system replacements.

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