• PN: TU804-1
• Brand: ABB
• Series: S800 I/O System, System 800xA DCS
• Type: Compact Screw Termination Unit

• Function: TU804-1 is a compact wiring terminal base specially designed for S800 series analog and digital I/O modules. It establishes stable electrical connections between field sensors, actuators and I/O modules, undertakes signal distribution and power transmission tasks. Equipped with channel-to-channel isolation design, it effectively avoids signal crosstalk and interference, and supports hot swapping of I/O modules, enabling online maintenance and replacement without shutting down the whole control system.

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Core Features

1. Compact structure with screw terminal wiring design, saving cabinet installation space and ensuring reliable long-term wiring connection
2. Built-in electrical isolation between each signal channel, effectively suppressing electromagnetic interference and improving signal acquisition accuracy
3. Hot-swap compatible, allowing individual I/O module replacement without interrupting the operation of the entire DCS system
4. Clear terminal number marking, convenient for field wiring debugging, circuit inspection and daily equipment maintenance
5. Industrial wide-temperature design, stable continuous operation in power, petrochemical, metallurgy and other harsh industrial environments

6. Standard DIN rail mounting, easy to install and arrange centrally inside control cabinets

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Technical Specifications

• Wiring Type: Screw Terminal
• Rated Supply Voltage: 24 VDC
• Operating Temperature: 0℃ ~ +60℃
• Storage Temperature: -40℃ ~ +85℃, 5%~95% RH non-condensing
• Dimension: 186.5 × 64 × 58.5 mm
• Net Weight: 0.21 kg
• Protection Class: IP20
• HS Code: 85389091
• Certifications: CE, UL

• Product Status: Brand new original and tested surplus spare parts available

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Compatibility

• Matched I/O Modules: S800 series AI810, AO810, DI810, DO810 and other standard analog & digital I/O modules
• Applicable Control System: ABB System 800xA, AC800M PLC, Advant OCS DCS
• Matched Communication Unit: RF615 PROFIBUS DP communication module, RC610 remote I/O base unit

• Not Compatible: S500 I/O modules, AC500 PLC terminal bases, third-party proprietary I/O systems

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Application

1. Field signal wiring connection for thermal power, petrochemical, water treatment and metallurgical automation projects
2. Compact layout design of S800 remote I/O stations in limited-space DCS control cabinets
3. Retrofit and maintenance of old ABB DCS systems, replacement of faulty terminal units

4. Precise signal collection and control output wiring for temperature, pressure, flow and other process instruments

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Our Advantage

• Passed strict wiring continuity, insulation resistance and hot swap compatibility tests before delivery
• 12-month warranty provided for brand new original and fully tested surplus termination units