Overview
Configured for redundant TB840/TB840A Optical ModuleBus Modem connection in non-redundant I/O configurations, the ABB 3BSE020848R11 (TU841 Module Termination Unit) provides direct physical and electrical execution within ABB S800 I/O ModuleBus systems.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TU841 |
| Full Article Number | 3BSE020848R11 |
| Brand | ABB |
| Product Type | Module Termination Unit (MTU) |
| Origin | Sweden |
| Communication Protocol | ModuleBus |
| Configuration Type | Redundant TB840/TB840A, Single I/O, Single Power |
| I/O Configuration | Non-redundant I/O |
| Line Redundancy | Yes |
| Hot Swap | No |
| Power Input | 24 VDC (19.2 – 30 V) |
| ModuleBus Current Distribution | Maximum 5 V 1.5 A and 24 V 1.5 A |
| Mechanical Key Configurations | 36 different combinations |
| Rated Insulation Voltage | 50 V |
| Dielectric Test Voltage | 500 VAC |
| Power Dissipation | 2.0 W |
| Acceptable Wire Size | Solid: 0.2 – 2.5 mm2; Stranded: 0.2 – 2.5 mm2, 24 – 12 AWG |
| Recommended Torque | 0.5 Nm |
| Mounting Position | Vertical or Horizontal |
| Weight | 0.45 kg |
| Dimensions | Width 124 mm, Height 186 mm including latch, Depth 47 mm |
| Operating Temp | 0 to +55 deg C |
| Storage Temp | -40 to +70 deg C |
| Relative Humidity | 5 to 95 %, non-condensing |
| Ingress Protection | IP20 according to IEC 60529 |
| Hazardous Location Certification | cULus Hazardous Location Class 1 Zone 2, ATEX Zone 2 |
| Marine Certificates | ABS, BV, DNV-GL, LR |
| Compliance | CE, EU RoHS, UAE RoHS, CN RoHS, WEEE Directive 2012/19/EU |
ABB ModuleBus Redundant Interface Characteristics
The TU841 provides a passive connection interface for redundant TB840/TB840A Optical ModuleBus Modems in ABB S800 I/O installations. The unit accepts two TB840/TB840A modules and distributes the ModuleBus connection to non-redundant I/O modules.
In addition, the TU841 uses a rotary switch for cluster address setting from 1 to 7. Four mechanical keys define the supported module configuration, and each key provides six positions. Therefore, the unit supports 36 mechanical configuration combinations that technicians can select with a screwdriver.
The ABB S800 architecture uses ModuleBus communication and I/O density scaling methods to organize field interface modules. The TU841 maintains the electrical connection path between the modem interface and the connected I/O hardware without active signal processing.
Frequently Asked Questions
Q: Does the TU841 support hot swap operation?
A: No. The TU841 does not support hot swap replacement. Technicians must follow the system shutdown and isolation procedures before removing connected modules.
Q: What is the purpose of the two TB840/TB840A positions on the TU841?
A: The two positions allow connection of redundant Optical ModuleBus Modems while the connected I/O configuration remains non-redundant.
Q: How does the TU841 set the ModuleBus cluster address?
A: The TU841 uses a rotary switch for cluster address selection. The available address range is from 1 to 7.
Field Installation Guidelines
- Install the TU841 on the ABB S800 I/O mounting arrangement using vertical or horizontal orientation according to cabinet design requirements.
- Verify that the 24 VDC power supply remains within the specified input range before connecting the unit.
- Configure the mechanical keys before installation to match the required module type.
- Use approved wire sizes within the specified range and tighten terminals using the recommended torque value.
- Separate ModuleBus wiring from high-voltage switching cables to reduce electrical interference.
- Connect protective earth according to the cabinet grounding design and applicable installation standards.
- Confirm the rotary switch cluster address before system commissioning.
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