Excellent PLC
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Product Overview
The ABB TU849 is a passive Module Termination Unit (MTU) designed for the redundant configuration of the Optical ModuleBus Modem TB840/TB840A within the System 800xA architecture. It provides dual power supply inputs, secure DIN rail mounting, mechanical keying, and configurable cluster addressing, ensuring high reliability in automation environments.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Redundant Module Termination Unit (MTU) |
| Article Number | 3BSE042560R1 |
| Supported Modems | TB840 / TB840A |
| Power Supply | Dual 24 V DC (19.2–30 V DC) |
| ModuleBus | Single electrical ModuleBus |
| ModuleBus Current Distribution | 5 V – max 1.5 A, 24 V – max 1.5 A |
| Power Dissipation | 2.5 W |
| Cluster Address | Rotary switch (1–7) |
| Mechanical Keys | 36 configurations (6 positions × 6) |
| Wire Size | 0.2 – 2.5 mm² (24–12 AWG) |
| Mounting | DIN rail (vertical or horizontal) |
| Rated Insulation Voltage | 50 V |
| Dielectric Strength | 500 V AC |
| Operating Temperature | 55°C (horizontal), 40°C (vertical) |
| Storage Temperature | -25°C to +70°C |
| Protection Class | IP20 |
| Certifications | cULus, ATEX Zone 2, CE, ABS, DNV-GL, BV, LR |
| RoHS/WEEE Compliance | Yes |
| Dimensions (W x H x D) | 124 × 186.5 × 47 mm |
| Weight | 0.45 kg |
Applications
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Redundant configuration for TB840/TB840A optical modems
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Industrial automation systems using ABB System 800xA
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Control system applications requiring reliable dual power input
-
I/O extension setups with non-redundant I/O networks
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Environments needing secure DIN rail module mounting
Product Advantages
-
Redundancy Ready: Supports two TB840/TB840A modems and dual power supplies
-
Secure Configuration: Mechanical keying prevents incorrect module insertion
-
Simplified Installation: Tool-operated latch for DIN rail locking
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Flexible Mounting: Vertical or horizontal installation options
-
Addressable Networking: Rotary switch for quick cluster addressing
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Certified for Harsh Environments: IP20 protection, ATEX Zone 2, marine approvals
FAQ
Q1: What is the function of the TU849?
A1: It serves as a termination unit for connecting TB840/TB840A to non-redundant I/O in redundant configurations.
Q2: Can the TU849 be hot-swapped?
A2: No, the TU849 does not support hot-swapping.
Q3: What type of power supply does it support?
A3: It supports dual 24 V DC power supplies, with a range of 19.2–30 V DC.
Q4: How many address clusters can be configured?
A4: The rotary switch allows up to 7 address clusters (1 to 7).
Q5: What mounting options are supported?
A5: The unit supports both vertical and horizontal DIN rail mounting.
Q6: Does it support redundant ModuleBus connections?
A6: No, it connects to a single electrical ModuleBus.
Q7: Is the TU849 compliant with RoHS directives?
A7: Yes, it meets RoHS compliance under directive 2011/65/EU.
Q8: Can it operate in marine environments?
A8: Yes, it holds certifications from ABS, BV, DNV-GL, and LR.
Q9: What is the rated insulation voltage?
A9: The rated insulation voltage is 50 V.
Q10: How many mechanical keying combinations are available?
A10: There are 36 possible mechanical keying configurations.
Related Models (Same Series or Function)
| Model | Description | Dimensions (mm) | Weight (kg) |
|---|---|---|---|
| TU848 | MTU for redundant I/O with TB840/TB840A | 124 × 186.5 × 47 | 0.45 |
| TU850 | MTU for single I/O and TB850 | 124 × 186.5 × 47 | 0.45 |
| TU851 | MTU for redundant I/O and TB850 | 124 × 186.5 × 47 | 0.45 |
| TU852 | MTU with extended wiring support | 124 × 186.5 × 47 | 0.45 |
| TU853 | MTU for complex I/O wiring setups | 124 × 186.5 × 47 | 0.45 |
| TB840A | Optical ModuleBus Modem (used with TU849) | 45 × 119 × 132 | 0.25 |
Popular ABB Models
| Model | Description | Dimensions (mm) | Weight (kg) |
|---|---|---|---|
| PM864AK01 | CPU module for AC 800M | 185 × 140 × 95 | 0.7 |
| CI854AK01 | Profibus DP communication interface | 127 × 51 × 185 | 0.4 |
| AI810 | Analog Input Module (8 channels) | 115 × 35 × 120 | 0.2 |
| DO810 | Digital Output Module (16 channels) | 115 × 35 × 120 | 0.2 |
| TU830V1 | Extended MTU for S800 I/O | 124 × 186.5 × 47 | 0.45 |
| CI860K01 | IEC 61850 communication interface | 127 × 51 × 185 | 0.4 |
