Overview
The ABB 3BSE046966R1 TU839, also cataloged as the TU839 Extended Module Termination Unit, provides field signal termination and sensor power distribution for DI820, DI821, and DI825 I/O modules within the ABB S800 I/O system.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU839 (3BSE046966R1) |
| Brand | ABB |
| Origin | Sweden |
| Product Type | Module Termination Unit |
| Connection Type | Terminal block |
| Configuration Type | Extended MTU |
| I/O Channels | 8 individually isolated channels |
| Supported I/O Modules | DI820, DI821, DI825 |
| Process Connections | 28 connections |
| Voltage Rating | 250 V |
| Maximum Current per I/O Channel | 1 A |
| Maximum Process Connection Current | 10 A |
| Sensor Power Distribution | Two individually isolated groups with fused outputs |
| Sensor Power Fuse Rating | 200 mA per group |
| I/O Configuration | Single I/O |
| Mounting Method | Standard DIN rail mounting |
| Mounting Direction | Both directions |
| Weight | 0.28 kg |
| Dimensions | 126 mm width x 64 mm depth x 110 mm height |
| Operating Temp | 0 to +55 deg C |
| Storage Temp | -40 to +70 deg C |
| Relative Humidity | 5 to 95 %, non-condensing |
| Protection Class | IP20 according to IEC 60529 |
| Power Consumption | Passive MTU, no independent power consumption |
| Wire Size | 24-14 AWG; 0.2-2.5 mm2 |
| Recommended Torque | 0.5 Nm |
| Dielectric Test Voltage | 2300 V a.c. channel to ground; 1350 V a.c. channel to channel |
| Electrical Safety Standards | EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201 |
| EMC Standards | EN 61000-6-4, EN 61000-6-2 |
ABB S800 I/O ModuleBus and I/O Distribution Characteristics
The TU839 extends ABB S800 I/O installation flexibility through direct ModuleBus distribution and field wiring termination. It transfers ModuleBus communication signals to the connected I/O module and the following MTU position. In addition, the unit shifts outgoing position signals to generate the correct address for the installed I/O module.
The unit provides eight isolated I/O channels, with each channel containing two I/O terminals. Furthermore, it supports two isolated process power groups for sensor supply distribution. Each group includes a 200 mA fuse to protect connected field devices.
The TU839 uses ABB S800 I/O mechanical keying technology to prevent incorrect I/O module insertion. Two mechanical keys provide 36 possible configuration combinations through six positions per key. This configuration only controls mechanical compatibility and does not modify electrical operation.
Frequently Asked Questions
Q: Does the TU839 provide active signal conversion or signal processing?
A: No. The TU839 is a passive Module Termination Unit that provides field connection, signal routing, and sensor power distribution without signal processing functions.
Q: How does the TU839 connect to the ABB S800 I/O system?
A: The TU839 connects the I/O module through the ModuleBus interface and distributes field wiring through terminal block connections.
Q: Can the TU839 support redundant I/O configurations?
A: No. The TU839 is specified for single I/O configurations with DI820, DI821, and DI825 modules.
Field Installation Guidelines
Install the TU839 on a standard DIN rail and confirm that the mechanical latch securely locks the unit to the rail. The DIN rail connection provides the grounding path required for the installed assembly.
Connect field wiring according to the assigned channel configuration and verify terminal torque before system commissioning. Keep sensor power wiring separated from high-noise power cables to reduce electrical interference.
Before inserting the I/O module, verify that the mechanical key positions match the intended module type. The key settings prevent incorrect physical installation but do not replace electrical verification procedures.
Follow ABB S800 I/O grounding, shielding, and cabinet wiring practices during installation. Confirm insulation resistance and dielectric requirements before applying process voltage.
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