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ABB TB850 – CEX-Bus Terminator
Product Overview
ABB TB850 is a CEX-Bus terminator specifically designed for ABB’s AC 800M and 800xA control systems. It serves as a critical component to ensure signal integrity on the CEX bus, eliminating signal reflection and attenuation that could cause communication instability or system failures. The module features a 25-pin DB25P male connector with screw fixing, and it must be installed on the last unit of the CEX bus to maintain reliable data transmission in industrial automation environments like petrochemical, metallurgy, and large-scale manufacturing.
Technical Specifications — TB850
| Parameter | Value |
|---|---|
| Product Model | TB850 |
| Manufacturer | ABB |
| Product Type | CEX-Bus Terminator |
| Power | Passive (no external power required) |
| Communication / Protocol | CEX-Bus; 10 Mbps forwarding speed (14881 pps), 100 Mbps (148810 pps) |
| Operating Temperature | -10°C to 50°C |
| Mounting | 19-inch 1U rack type |
| Dimensions (HxWxD) | 44.5 mm × 440 mm × 370 mm |
| Weight | 4.3 kg |
| Typical Interfaces | 25-pin DB25P male connector (screw-fixed) |
| Compliance | IEC 61850-3, RoHS |
ABB TB850
Key Features and Benefits — TB850
- Signal Integrity Protection: Eliminates signal reflection and attenuation on the CEX bus, ensuring stable data transmission between control system units.
- Secure Connection: Equipped with a screw-fixed DB25P male connector, preventing loose connections caused by industrial vibration.
- System Compatibility: Fully compatible with ABB AC 800M (4.1-6.0 versions) and 800xA control systems, enabling seamless integration.
- Passive Design: Requires no external power supply, reducing wiring complexity and potential power-related faults in industrial settings.
Related Models
- TB851: ABB CEX-Bus terminator variant with enhanced anti-interference performance, suitable for harsh industrial environments.
- TK850: ABB CEX-Bus extension cable, paired with TB850 to extend bus distance and enable cross-cabinet signal transmission.
- TB825: ABB analog input module, works with TB850 in 800xA systems for precise signal collection.
- TB852: ABB analog output module, compatible with TB850 to deliver controlled signals to industrial actuators.
Installation and Maintenance — TB850
- Installation: Mount on a 19-inch 1U rack; install exclusively on the last unit of the CEX bus. Ensure the DB25P connector is securely screwed to avoid contact issues.
- Configuration: No additional programming needed; confirm system compatibility (AC 800M/800xA) before installation.
- Maintenance: Regularly inspect the connector’s tightness and rack mounting stability. Replace immediately if the connector is damaged or signal transmission is unstable.
This terminator is essential for maintaining reliable operation of ABB CEX-Bus systems, preventing communication faults and ensuring continuous performance in critical industrial automation applications.
