Overview
The ABB TU841 Termination Unit (Part No. 3BSE020848R1) is a passive module designed to connect TB840/TB840A Optical ModuleBus Modems to ABB’s S800 I/O system. Unlike active PLC modules, the TU841 does not perform logic or processing; instead, it ensures secure electrical termination, power supply connections, and cluster address configuration.
It is specifically intended for non‑redundant I/O setups, while the TU840 is used for redundant I/O. The TU841 is widely deployed in ABB 800xA and AC 800M automation platforms, where reliability and ease of installation are critical.
Technical Data
| Specification | Value / Description |
|---|---|
| Product Type | Termination Unit TU841 |
| Dimensions | 124 × 186 × 47 mm |
| Weight | 0.45 kg |
Typical Applications
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Process industries: Connecting optical modems to non‑redundant I/O in chemical and pharmaceutical plants.
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Power generation: Supporting turbine and boiler control systems with secure communication.
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Water treatment facilities: Providing reliable modem termination for pumps and mixers.
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Manufacturing automation: Ensuring stable communication in production lines.
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Infrastructure systems: Applied in building automation and utility monitoring networks.
For example, engineers often use the TU841 when non‑redundant communication is sufficient, saving cost and complexity compared to redundant setups.
FAQ
Q1: Is the TU841 a PLC module?
A1: No, it is a termination unit (MTU), not a PLC processor.
Q2: What is the difference between TU840 and TU841?
A2:
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TU840: Connects TB840/TB840A to redundant I/O.
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TU841: Connects TB840/TB840A to non‑redundant I/O.
Q3: How are cluster addresses set?
A3: A rotary switch allows settings from 1 to 7.
Q4: What accessories are included?
A4: It comes with a power supply connector and a TB807 ModuleBus terminator.
Q5: How is the TU841 installed?
A5: It is DIN‑rail mounted with a mechanical latch for quick installation.
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| Condition | 100% New with Original Package |
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
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| A: Yes, we collaborate with over 50 countries worldwide. As a top supplier in China, we offer significant discounts based on market trends. |
| Q: What Is the Warranty Period? |
| A: All our new and original products come with a standard one-year warranty. |
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| A: We require 100% T/T (Telegraphic Transfer) payment before shipping. For items with a lead time, a 30% deposit is needed upfront, and the remaining 70% is due before shipping. If you have a representative in China, you can arrange an RMB transfer through them. |
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| A: Delivery usually takes 1-3 days after receiving the initial payment. For items with a lead time, shipping will occur according to the specified schedule. |
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| A: We ensure safe packaging with multiple layers of protection. Products are first placed in their original boxes and sealed with labels. A layer of bubble wrap is then added for collision protection during transit. Finally, the items are packed securely in durable boxes. |
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