Overview
Configured for signal termination and ModuleBus distribution in the ABB S800 I/O system, the ABB TU850 (3BSE050930R1) (TU850 Extended Module Termination Unit) provides direct electrical connection for up to 16 I/O channels.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU850 (3BSE050930R1) |
| Brand | ABB |
| Origin | Sweden |
| Product Type | Extended Module Termination Unit |
| Weight | 0.26 kg |
| Dimensions | 126 mm W x 64 mm D x 110 mm H |
| Operating Temp | 0 to +55 deg C |
| Power Consumption | Passive MTU, no external power consumption specified |
| I/O Channels | 16 channels |
| Maximum Rated Voltage | 50 V |
| Maximum Current per I/O Channel | 15 mA per digital input channel; 25 mA per two analog input channels |
| Maximum Current Rating | 2 A |
| Compatible I/O Modules | AI810, DI810, DI811, DI830, DI831 |
| Connection Type | Terminal block |
| Process Connections | 40 connections for up to 16 I/O channels |
| Sensor/Transmitter Power Outlets | 16 current limited outlets |
| Connector Interface | D-sub connector 25 pin male |
| Mounting Method | Standard DIN rail mounting |
| Mounting Direction | Both directions |
| Wire Size | Solid: 0.2 – 4 mm²; Stranded: 0.2 – 2.5 mm², 24 – 12 AWG |
| Recommended Torque | 0.5 – 0.6 Nm |
| Stripping Length | 7 mm |
| Dielectric Test Voltage | 500 V AC |
| Protection Class | IP20 according to IEC 60529 |
| Hazardous Location Certification | C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2 |
| Relative Humidity | 5 to 95 %, non-condensing |
| Corrosion Protection | ISA-S71.04: G3 |
| EMC Compliance | EN 61000-6-4, EN 61000-6-2 |
| Safety Standards | EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201 |
| Pollution Degree | Degree 2, IEC 60664-1 |
ABB S800 I/O ModuleBus and I/O Density Scaling
The TU850 manages ModuleBus distribution between the connected I/O module and the following MTU position. It shifts outgoing position signals to generate the correct address identification for downstream MTUs. Therefore, the unit maintains proper I/O addressing within the ABB S800 I/O architecture.
Additionally, the TU850 supports I/O density scaling through a 16-channel termination structure. It uses two mechanical coding keys with six positions each, creating 36 possible configurations for different I/O module types. The key settings only provide mechanical identification and do not modify electrical operation.
The unit supports ABB industrial control installations that require DIN-rail mounting, terminal-based field wiring, and direct interface with S800 I/O modules. Furthermore, the passive design avoids additional configuration requirements through software parameters.
Frequently Asked Questions
Q: Does the TU850 provide electrical power to the connected I/O module?
A: No. The TU850 is a passive Module Termination Unit. It distributes ModuleBus signals and field connections but does not operate as an independent power supply.
Q: How does the TU850 identify different I/O module configurations?
A: The TU850 uses two mechanical keys with six positions each. These keys create 36 mechanical configurations without changing the electrical function of the MTU or I/O module.
Q: Can the TU850 support hazardous area installations?
A: Yes. The TU850 supports hazardous location applications with certifications including ATEX Zone 2, C1 Div 2 cULus, and C1 Zone 2 cULus.
Field Installation Guidelines
Install the TU850 on a standard DIN rail and verify that the mechanical latch engages correctly before connecting field wiring. Use approved conductor sizes according to the terminal specifications.
Route signal cables separately from high-current power cables to reduce electrical interference. Connect cable shields according to the system grounding design and applicable EMC installation practices.
Before commissioning, verify the mechanical key positions match the selected ABB S800 I/O module type. Confirm terminal connections, ModuleBus continuity, and field signal polarity before applying system power.
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