ABB TU841 | S800 I/O Termination Unit with Mechanical Keying
Manufacturer: ABB
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Part Number: TU841
Condition：New with Original Package
Product Type: Termination Unit with Mechanical Keying
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Description
The ABB TU841, part number 3BSE020848R1, is a Module Termination Unit (MTU) designed for the S800 I/O system, part of ABB’s System 800xA platform. It connects Optical ModuleBus Modems TB840/TB840A in redundant configurations to non-redundant I/O modules.
This MTU provides connections for power supply, one electrical ModuleBus, and two optical modems, ensuring reliable communication and fault tolerance in distributed control systems.
The TU841 features a rotary switch for cluster addressing (positions 1–7) and mechanical keying to prevent incorrect module insertion. With 36 possible keying configurations, it supports flexible and secure installation in demanding industrial automation environments.
Technical Specifications
| Specification | Details |
|---|---|
| Model Number | TU841 |
| Part Number | 3BSE020848R1 |
| System Compatibility | ABB S800 I/O, System 800xA |
| Function | MTU for redundant TB840/TB840A with non-redundant I/O |
| ModuleBus Connections | 1 electrical ModuleBus, 2 optical ModuleBus (via TB840/TB840A) |
| Cluster Addressing | Rotary switch, positions 1–7 |
| Mechanical Keying | 4 keys (2 per position), 6 positions each → 36 configurations |
| Mounting Type | DIN rail |
| Application Areas | Distributed control systems, process automation |
| Country of Origin | Germany / Spain / United States |
| Dimensions (L × W × H) | 160 mm × 160 mm × 120 mm |
| Weight | 0.8 kg |
FAQ
Q1: What is the purpose of the TU841?
A1: The TU841 connects TB840/TB840A modems to non-redundant I/O, enabling reliable communication in distributed systems.
Q2: How many keying configurations are available?
A2: The MTU supports 36 mechanical keying configurations for secure module installation.
Q3: Can it handle multiple optical modems?
A3: Yes, it connects up to two TB840/TB840A modems simultaneously.
Q4: How is the cluster address set?
A4: Via a rotary switch with positions 1 to 7.
Q5: What mounting type is supported?
A5: The unit is designed for DIN rail mounting, ensuring easy integration.