Overview
The ABB TB850 is a compact, screw-mounted terminator used in distributed control systems (DCS) to finalize the CEX-Bus communication line. It features a 25-pin DB25P male connector and is designed for use with ABB’s AC 800M series, including PM864 and PM891 processor units. Moreover, the TB850 plays a critical role in maintaining signal quality by eliminating electrical reflections at the end of the bus. Its passive design requires no external power and offers near-zero power consumption, making it ideal for long-term industrial deployment. In addition, the module complies with international standards for control system accessories and is CE and UL certified.
Technical Data / Specifications
| Specification | Details |
|---|---|
| Model | TB850 |
| Product Type | CEX-Bus Terminator |
| Operating Temperature | 0°C to +55°C |
| Dimensions | 55 mm × 16 mm × 50 mm |
| Weight | 0.04 kg |
Typical Applications
The TB850 is essential in ABB AC 800M systems for terminating the CEX-Bus communication line. It ensures reliable data transmission between processor units and communication interfaces in distributed control architectures. For instance, in a power plant or chemical facility, the TB850 is installed at the last node of the CEX-Bus to prevent signal degradation. In addition, it supports integration with various ABB modules such as PM864AK01, CI854A, and other CEX-Bus compatible units. Its simple installation and passive operation make it a preferred choice for system engineers and maintenance teams.
FAQ
Q: What is the function of the TB850 terminator?
A: It terminates the CEX-Bus to prevent signal reflection and ensure stable communication in ABB control systems.
Q: Is external power required for the TB850?
A: No, it is a passive device with near-zero power consumption.
Q: What systems is it compatible with?
A: It is designed for ABB AC 800M systems and works with CEX-Bus modules like PM864 and CI854A.
Q: How is the TB850 installed?
A: It uses a 25-pin DB25P male connector and is fixed with screws at the last unit on the bus.
Q: What are the environmental ratings?
A: Operating temperature is 0°C to +55°C, with IP20 protection for indoor control cabinet use.
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