Overview
Configured for field signal termination and ModuleBus distribution in the ABB S800 I/O system, the ABB TU813 (3BSE036714R1) (TU813 Compact Module Termination Unit) provides direct physical and electrical connection between field wiring and compatible I/O modules.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU813 |
| Brand | ABB |
| Article Number | 3BSE036714R1 |
| Product Type | Compact Module Termination Unit (MTU) |
| System Platform | ABB S800 I/O System |
| Origin | Sweden |
| Weight | 0.17 kg |
| Dimensions | 170 mm x 64 mm x 64 mm |
| Installed Width | 58.5 mm edge-to-edge |
| Operating Temp | Horizontal mounting: 0 to +55 deg C; Vertical mounting: 0 to +40 deg C |
| Storage Temp | -40 to +70 deg C |
| Protection Rating | IP20 according to IEC 60529 |
| Relative Humidity | 5% to 95%, non-condensing |
| Hazardous Location | ATEX Zone 2 |
| Number of Channels | 8 isolated channels |
| Process Connections | 16 field connection points |
| Connection Type | Crimp snap-in connector |
| Rated Voltage | 250 V AC/DC |
| Maximum Current | 3 A per channel |
| ModuleBus Current | Maximum 1.5 A at 5 V / Maximum 1.5 A at 24 V |
| Acceptable Wire Size | 0.2 to 2.5 mm² stranded wire (24 to 14 AWG) |
| Compatible Modules | DI820, DI821, DI825, DO820, DO821, AI825 |
| Redundancy Configuration | Single non-redundant |
ABB S800 I/O ModuleBus and I/O Density Scaling
The ABB TU813 applies the S800 I/O backplane bus architecture to distribute ModuleBus power and communication signals between connected I/O modules and adjacent MTUs. Therefore, the unit maintains automatic address generation through signal position shifting without requiring manual address configuration.
The TU813 supports I/O density scaling through eight isolated channels and sixteen field connection points. Additionally, the mechanical keying system uses two six-position rotary keys to create 36 possible configurations, preventing incompatible I/O module installation.
The unit follows ABB industrial control hardware design principles, including backplane bus communication management, modular I/O expansion, and firmware flash compatibility considerations within the S800 I/O platform.
Frequently Asked Questions
Q: Does the ABB TU813 provide electrical isolation between field channels?
A: Yes. The TU813 provides eight isolated field channels for connecting compatible ABB S800 I/O modules. The unit functions as a passive termination interface and does not process field signals.
Q: Can the TU813 operate with redundant MTU configurations?
A: No. The TU813 is specified as a single non-redundant Compact Module Termination Unit. Redundancy functions depend on the selected I/O module and system configuration.
Q: How does the TU813 prevent incorrect I/O module installation?
A: The TU813 uses mechanical keying with two six-position rotary keys. The key positions define compatible module insertion configurations.
Field Installation Guidelines
- Mount the TU813 directly on a standard DIN rail using the integrated locking mechanism.
- Verify that the installed I/O module matches the mechanical key configuration before insertion.
- Route field wiring separately from high-voltage power cables to reduce electrical interference.
- Ensure terminal connections use suitable wire sizes within the specified 0.2 to 2.5 mm² range.
- Connect the DIN rail grounding path according to the cabinet grounding design.
- Maintain proper cabinet ventilation to keep the operating temperature within the specified range.
- Check ModuleBus alignment between adjacent MTUs before completing the installation.
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