Overview
The ABB TU811 3BSE008526R1, also cataloged as the TU811 Compact Module Termination Unit, operates as a dedicated field wiring interface component for signal termination and ModuleBus power distribution within the ABB S800 I/O System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU811 3BSE008526R1 |
| Brand | ABB |
| Product Type | Compact Module Termination Unit (MTU) |
| System Compatibility | ABB System 800xA / S800 I/O System |
| Origin | Sweden |
| Weight | Approx. 0.18 kg to 0.20 kg |
| Dimensions | 64 mm x 170 mm x 64 mm |
| Operating Temp | 0 deg C to +55 deg C horizontal mounting; 0 deg C to +40 deg C vertical mounting |
| Storage Temperature | -40 deg C to +70 deg C |
| Relative Humidity | 5% to 95%, non-condensing |
| Power Consumption | Passive MTU; no independent power consumption |
| Rated Voltage | 250 V AC/DC |
| Maximum Current per Channel | 3 A |
| Number of Channels | 8 isolated channels |
| Terminal Configuration | 2 x 8 signal terminals |
| Compatible I/O Modules | DI820, DI821, DO820, DO821 |
| Dielectric Test Voltage | 2000 V AC |
| Protection Class | IP20 according to IEC 60529 |
| Mounting Type | 35 mm DIN rail mounting |
| Terminal Type | Screw terminals |
| Solid Wire Size | 0.2 mm2 to 4.0 mm2 |
| Stranded Wire Size | 0.2 mm2 to 2.5 mm2 |
| Tightening Torque | 0.5 Nm to 0.6 Nm |
| Stripping Length | 7 mm |
ABB S800 I/O ModuleBus and Industrial Control Integration
The TU811 provides a passive electrical and mechanical interface between field wiring and ABB S800 I/O modules. It routes field signals through screw terminals and transfers ModuleBus communication and supply connections to the mounted I/O module and adjacent MTUs.
Furthermore, the unit supports ABB industrial control architectures through structured I/O density scaling. The mechanical keying system provides 36 key combinations, which prevents incorrect module installation during maintenance activities. The grounding latching mechanism connects directly to the DIN rail and maintains the protective grounding path.
The TU811 supports backplane bus communication velocity management within the S800 I/O architecture. In addition, it maintains firmware flash compatibility through the installed I/O module rather than through the passive MTU itself.
Frequently Asked Questions
Q: Does the ABB TU811 contain active electronic processing circuits?
A: No. The TU811 is a passive Module Termination Unit. It provides terminal connections, mechanical mounting, ModuleBus routing, and power distribution functions.
Q: Which ABB I/O modules can be installed with the TU811?
A: The TU811 supports compatible ABB S800 I/O modules including DI820, DI821, DO820, and DO821 modules.
Q: Can the TU811 be replaced by the TU811V1 version?
A: Yes. The TU811 3BSE008526R1 has been superseded by TU811V1 3BSE013231R1, which maintains compatibility with the original installation configuration.
Field Installation Guidelines
- Install the TU811 on a standard 35 mm DIN rail and verify mechanical locking before connecting field wiring.
- Confirm the selected I/O module matches the MTU mechanical keying configuration before insertion.
- Route signal cables separately from high-current power conductors to reduce electrical interference.
- Connect protective grounding through the DIN rail grounding latch according to the cabinet grounding design.
- Verify terminal tightening torque and conductor preparation before commissioning.
- Inspect ModuleBus connections between adjacent MTUs to ensure correct alignment and communication continuity.
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