Product Introduction
When you need a reliable and compact solution for field wiring termination in your S800 I/O system, the ABB TU812V1 delivers. This 50 V compact module termination unit (MTU) provides 16 signal connections and serves as a passive interface between field wiring and I/O modules. As part of the S800 I/O family, the TU812V1 distributes the ModuleBus to connected I/O modules and passes position signals to the next MTU, ensuring correct addressing.
Technical Specifications Breakdown
The TU812V1 operates at 50 V and supports up to 16 I/O channels via a 25-pin D-sub connector. Key electrical parameters include a maximum current of 2 A per I/O channel and 5 A per process connection. The dielectric test voltage is 500 V a.c., ensuring robust isolation. The unit measures 64 mm in width (including connector), 64 mm in depth (including terminals), and 170 mm in height (including latch), with a weight of 0.17 kg. It mounts on a DIN rail in both directions, with temperature ratings of 55 °C for horizontal mounting and 40 °C for vertical mounting. The protection class is IP20 according to IEC 60529.
Industry Applications
In process control environments, the TU812V1 connects field devices such as sensors and actuators to ABB S800 I/O modules. For example, in a chemical plant, it terminates up to 16 analog or digital signals from transmitters, reducing wiring complexity. Its mechanical keying prevents insertion of incompatible I/O modules, minimizing configuration errors. The unit supports both single and redundant I/O configurations, making it suitable for critical applications requiring high availability.
Installation & Setup Guidance
Mount the TU812V1 on a standard DIN rail using its latching device for grounding. Connect field wiring to the 25-pin D-sub male connector, which accommodates up to 16 I/O signals. Set the two mechanical keys to match the I/O module type—each key has six positions, offering 36 possible configurations. Ensure the ambient temperature does not exceed 55 °C for horizontal mounting or 40 °C for vertical mounting. For redundant I/O setups, use two TU812V1 units with compatible modules.
Maintenance & Reliability
Periodically inspect the TU812V1 for signs of corrosion or damage, especially in environments with high humidity (5 to 95 % non-condensing) or corrosive gases (ISA-S71.04 G3). The unit operates reliably in temperatures from 0 to +55 °C and can be stored from -40 to +70 °C. Its IP20 protection requires installation in a clean, dry enclosure. No internal components require user service; simply verify the mechanical keying and connector integrity during routine checks.
Compatibility & Integration
The TU812V1 works with a wide range of ABB S800 I/O modules, including AI810, AI815, AI820, AI830, AI830A, AI835, AI835A, AI845, AO810, AO810V2, AO815, AO820, AO845, AO845A, DI810, DI811, DI814, DI830, DI831, DI840, DI880, DI885, DO810, DO814, DO840, DO880, DP820, and DP840. It connects to the ModuleBus and supports single I/O configurations. The unit carries CE mark, electrical safety certifications (EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201), hazardous location approvals (C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2), and marine certifications (ABS, BV, DNV-GL, LR).
Selection Guide & Purchasing Advice
Before ordering the TU812V1, verify your I/O module compatibility from the list above and confirm the required number of signal connections (up to 16). The unit is designed for single I/O systems; for redundant applications, order two units. Ensure your DIN rail meets the mounting requirements and that the ambient temperature stays within the specified limits. SpareTechPLC stocks the TU812V1 with fast shipping and expert support. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
Q1: What is the maximum current per I/O channel on the TU812V1?
A1: The maximum current per I/O channel is 2 A, with a maximum process connection current of 5 A.
Q2: Can the TU812V1 be used in hazardous locations?
A2: Yes, it has hazardous location approvals including C1 Div 2 cULus, C1 Zone 2 cULus, and ATEX Zone 2.
Q3: How many signal connections does the TU812V1 support?
A3: It supports up to 16 I/O signals via a 25-pin D-sub connector.
Q4: What is the operating temperature range for horizontal mounting?
A4: For horizontal mounting, the maximum ambient temperature is 55 °C (131 °F).
Q5: Does the TU812V1 require a separate power supply?
A5: No, the TU812V1 is a passive MTU and does not require its own power supply; it distributes the ModuleBus from the I/O module.
