Excellent PLC
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| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Product Overview
The ABB TU846 is a Module Termination Unit (MTU) designed for use with redundant CI840/CI840A communication interfaces in the S800 I/O system. It enables reliable connection of power, communication, and service interfaces, supporting redundancy and minimizing downtime in automation environments. It features dual ModuleBus connections, rotary address switches, and PROFIBUS connectivity, making it ideal for critical process automation systems.
Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | TU846 |
| Article Number | 3BSE022460R1 |
| Dimensions (W x H x D) | 124 x 186 x 47 mm |
| Weight | 0.5 kg |
| Power Supply Input | 24 V DC (19.2 – 30 V) |
| Mounting | DIN rail (Vertical/Horizontal) |
| Communication Protocol | PROFIBUS DP-V1 |
| Redundancy Support | Yes (Line and Module redundancy) |
| ModuleBus Current Output | 5 V @ 1.5 A; 24 V @ 1.5 A |
| Connectors | PROFIBUS: DSUB9; Service: RJ45 |
| Address Configuration | Rotary switches (0–99) |
| Mechanical Keying | 36 configurations |
| Operating Temperature | 0 to +55 °C (approved: +5 to +55 °C) |
| Storage Temperature | -40 to +70 °C |
| Relative Humidity | 5% to 95%, non-condensing |
| Ingress Protection | IP20 |
| Safety Compliance | EN 61010-1, UL 61010-1, ATEX Zone 2, IEC60536 Class I |
| RoHS/WEEE Compliance | Yes |
Applications
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Redundant I/O systems in process automation
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Safety-critical industrial automation
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Distributed control systems (DCS)
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Oil & gas, chemicals, and power generation industries
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Integration of CI840/CI840A with dual ModuleBus configurations
Key Advantages
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Supports redundant communication and I/O for system reliability
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Mechanical keying ensures correct module insertion
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Simple station address configuration via rotary switches
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Compact DIN rail-mountable design
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Multiple safety and environmental certifications
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Easy service access with RJ45 connectors
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Enables hot-redundancy in critical industrial systems
Frequently Asked Questions (FAQ)
Q1: What type of modules is TU846 compatible with?
A1: TU846 supports redundant CI840/CI840A modules with redundant I/O configurations.
Q2: Can the TU846 be hot-swapped?
A2: No, it cannot be replaced while power is applied.
Q3: What is the maximum cable length for the ModuleBus?
A3: The maximum length from TU846 to the ModuleBus terminator is 2.5 meters.
Q4: How many address settings are available?
A4: TU846 provides rotary switches for 100 station address settings (0 to 99).
Q5: What connectors are used for PROFIBUS and service ports?
A5: PROFIBUS uses a DSUB9 connector; service ports use RJ45 connectors.
Q6: What is the IP rating of the unit?
A6: It is rated IP20 according to IEC 529.
Q7: Does the TU846 support hazardous area installation?
A7: Yes, it meets ATEX Zone 2 and cULus Class I Zone 2 standards.
Q8: How many mechanical keying combinations are supported?
A8: It supports 36 different mechanical key combinations.
Q9: What are the acceptable wire sizes?
A9: Wire sizes from 0.25 to 2.5 mm² (24 – 14 AWG) are accepted.
Q10: What are the mounting options?
A10: It supports both vertical and horizontal DIN rail mounting.
Related ABB S800 I/O Series Models
| Model | Description | Dimensions (mm) | Weight |
|---|---|---|---|
| TU847 | MTU for single CI840/CI840A | 124 x 186 x 47 | 0.5 kg |
| CI840A | Communication interface module | 45 x 110 x 120 | 0.4 kg |
| TB846 | Optical ModuleBus interface | 45 x 120 x 125 | 0.45 kg |
| TB842 | Optical ModuleBus Port | 45 x 120 x 125 | 0.42 kg |
| TU841 | Compact MTU for single I/O modules | 124 x 186 x 47 | 0.5 kg |
| TU849 | Extended MTU for dual channel I/O modules | 124 x 186 x 47 | 0.5 kg |
Popular ABB Models
| Model | Description | Dimensions (mm) | Weight |
|---|---|---|---|
| PM864AK01 | AC 800M Controller | 210 x 180 x 70 | 1.2 kg |
| CI854AK01 | PROFIBUS DP interface module | 45 x 120 x 110 | 0.35 kg |
| AI810 | Analog Input Module (8 ch, 4-20mA) | 45 x 120 x 115 | 0.28 kg |
| AO820 | Analog Output Module (4 ch, 4-20mA) | 45 x 120 x 115 | 0.27 kg |
| DO810 | Digital Output Module (16 ch, 24VDC) | 45 x 120 x 115 | 0.25 kg |
| DI820 | Digital Input Module (16 ch, 24VDC) | 45 x 120 x 115 | 0.25 kg |
