Product Overview
The ABB TU811V1 is a compact 8-channel module termination unit (MTU) designed for the S800 I/O system. This passive unit connects field wiring to I/O modules and carries part of the ModuleBus. It distributes the ModuleBus to the I/O module and to the next MTU, while generating the correct address by shifting outgoing position signals. Mechanical keying with 36 possible configurations prevents incorrect I/O module insertion, ensuring reliable operation.
Key Features
- Compact installation for space-saving control panels
- Up to 8 isolated channels for field signals
- Direct connections to ModuleBus and I/O modules
- Mechanical keying prevents wrong module insertion
- Latching device for secure DIN rail grounding
- DIN rail mounting for flexible orientation
Technical Specifications
| Parameter |
Value |
| Article Number |
3BSE013231R1 |
| Type |
Compact |
| Connection |
Terminal block |
| Channels |
8 |
| Voltage |
250 V |
| Maximum Current per I/O Channel |
3 A |
| Acceptable Wire Sizes |
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 |
2000 V a.c. |
| Operating Temperature |
0 to +55 °C (+32 to +131 °F) |
| Storage Temperature |
-40 to +70 °C (-40 to +158 °F) |
| Protection Class |
IP20 (IEC 60529) |
| Dimensions (W x D x H) |
64 mm x 64 mm x 170 mm (incl. connector/terminals/latch) |
| Weight |
0.17 kg (0.37 lbs) |
Industry Applications
The ABB TU811V1 excels in discrete automation environments where reliable signal termination is critical. Typical applications include:
- Manufacturing assembly lines with DI820, DI821, DO820, and DO821 I/O modules
- Process control systems requiring isolated field connections
- Machine builder panels where compact MTU installation reduces enclosure size
With its 250 V rating and 3 A per channel, the TU811V1 handles moderate power signals while maintaining isolation for sensitive logic.
Installation & Setup
Mount the TU811V1 on a DIN rail using the integrated latching device for proper grounding. The unit supports both horizontal and vertical mounting; however, vertical orientation reduces the maximum ambient temperature to 40 °C (104 °F). Use the mechanical keys to set the desired configuration before inserting the I/O module. Acceptable wire sizes range from 0.2–4 mm² solid or 0.2–2.5 mm² stranded (24–12 AWG). Apply a torque of 0.5–0.6 Nm and strip 7 mm of insulation for reliable connections.
Maintenance & Reliability
The passive design of the TU811V1 ensures minimal wear, but periodic inspection of terminal tightness and keying alignment is recommended. Operate within the 0 to +55 °C range to maintain full performance. The unit meets CE, UL, and marine certifications (ABS, BV, DNV-GL, LR), and complies with EMC standards EN 61000-6-4 and EN 61000-6-2, ensuring robust operation in industrial environments.
Compatibility & Integration
Designed for the ABB S800 I/O system, the TU811V1 works with DI820, DI821, DO820, and DO821 modules. It supports single I/O configurations and connects directly to the ModuleBus. Its compact size and DIN rail mounting simplify integration into existing cabinets.
Selection Guide
Before ordering, verify your I/O module type and channel count. The TU811V1 is ideal for 8-channel applications requiring 250 V isolation. For redundant systems, consider alternative MTUs. PLC Source PRO offers genuine ABB TU811V1 units with fast shipping and expert support.