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- ABB
- TB851
- CEX-Bus Terminator
- Sweden
- 55 × 16 × 45 mm
- 0.04kg
- 3BSC950194R1
- Xiamen, China
- New & In Stock
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Product Overview: ABB TB851 (3BSC950194R1)
Brand & Series
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Brand: ABB
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Series: S800 / AC 800M / 800xA Automation Accessories
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Product Type: CEX‑Bus Terminator Module
Product Description
The TB851 (3BSC950194R1) is a passive terminator module designed for CEX‑Bus communication networks in industrial automation systems. It ensures signal integrity by eliminating reflections at the end of a bus line, which is critical for reliable communication between controllers and I/O modules in AC 800M and 800xA distributed control systems.
This module is compact, lightweight, and DIN-rail mountable, requiring no external power or maintenance. Its design guarantees long-term reliability in harsh industrial environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | TB851 |
| Part Number | 3BSC950194R1 |
| Function | CEX‑Bus Terminator |
| Bus Compatibility | CEX‑Bus |
| Voltage Requirement | Passive, no power required |
| Bus Connector | 25‑pin DB25 female |
| Mounting Type | DIN rail / Panel mount (S800 compatible) |
| Dimensions (H×W×D) | 55 × 16 × 45 mm |
| Weight (kg) | 0.04 |
| Operating Temperature | 0–55 °C |
| Storage Temperature | −40–+70 °C |
| Humidity | 5–95 % non‑condensing |
| Environmental Compliance | RoHS, CE, UL |
| Compatibility | AC 800M, 800xA systems |
Applications
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Termination of CEX‑Bus lines in control cabinets
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Process automation networks
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Oil & gas, chemical, and petrochemical plants
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Power generation and substation monitoring
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Water and wastewater treatment systems
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Mining and material processing automation
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Manufacturing production lines requiring reliable bus communication
Key Advantages
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Signal Integrity: Eliminates reflections, preventing data errors.
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Compact & Lightweight: Small footprint; easy panel installation.
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Maintenance-Free: Passive design, no power required.
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Easy Integration: DIN rail or panel mount installation.
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Industrial Compatibility: Works with AC 800M and 800xA systems.
Recommended Related Models (Same Series / Similar Function)
| Model | Description | Basic Parameters |
|---|---|---|
| TB840A | S800 CEX‑Bus terminator | Dimensions 55×16×45 mm, Weight 0.04 kg |
| TU842 | AC 800M termination unit | DIN rail mount, passive, similar bus interface |
| TU810V1 | Compact S800 module terminator | Small size, CEX‑Bus compatible |
| TU845 | S800 I/O termination unit | Standard S800 DIN mounting |
| CI872K01 | AC 800M communication interface | Interface module for bus networks |
Popular ABB Models (Other Hot Units)
| Model | Category | Key Features |
|---|---|---|
| PM861AK01 | AC 800M CPU module | Central controller CPU |
| PM867 | High-end processor | Redundant CPU, advanced performance |
| AI810 | Analog Input Module | 8-channel AI, S800 system |
| DP840 | Pulse Counter Module | Counts pulses, specialty I/O |
| CI840A | Profibus DP Interface | Communication interface for Profibus |
FAQ (10 Q&A)
Q1: What is the TB851 used for?
A1: It terminates the CEX‑Bus line to prevent signal reflections and maintain communication integrity.
Q2: Does it require external power?
A2: No, it is a passive module and operates without power.
Q3: Where should it be installed?
A3: At the end of the CEX‑Bus line in the control system cabinet.
Q4: Which systems is it compatible with?
A4: ABB AC 800M and 800xA distributed control systems.
Q5: Can it be reused in another installation?
A5: Yes, if the module is still functional and properly installed.
Q6: What happens if the terminator is missing?
A6: Signals may reflect back, causing data errors or communication failures.
Q7: What environmental conditions can it handle?
A7: Operating temperature 0–55 °C, storage −40–+70 °C, humidity 5–95 % non‑condensing.
Q8: How is it mounted?
A8: On a DIN rail or panel mount with standard screws.
Q9: Does it provide diagnostic feedback?
A9: No, it is passive; status is monitored indirectly through bus performance.
Q10: Is it compliant with environmental standards?
A10: Yes, it is RoHS and CE compliant.