ABB TB850, article number 3BSC950193R1, is a CEX-Bus terminator for AC 800M controller communication-bus installations. ABB specifies a 25-pin DB25P male connector and screw fixing.
- Manufacturer: ABB
- Article number: 3BSC950193R1
- Type: TB850
- Product function: CEX-Bus terminator
Its specific function is to terminate the CEX-Bus at the end of the installed bus. ABB states that a TB850 must always be installed on the last unit on the CEX-Bus; it is therefore a bus accessory and does not measure or process field analog or digital I/O signals. ABB includes two TB850 terminators in the BC810K02 CEX-Bus interconnection package and in the BC820K02 CEX-Bus interconnection package. Those packages also contain their corresponding interconnection/baseplate components, so the complete topology must follow the applicable ABB AC 800M hardware documentation. The product is used in System 800xA and Compact Product Suite AC 800M controller cabinets where communication-interface units extend the CEX-Bus. Its role is correct physical bus termination, not process control, signal conditioning, protocol conversion or equipment protection.
Important Notice: Verify the exact physical nameplate and do not confuse this item with TB851 / 3BSC950194R1, which is the DB25S female CEX-Bus terminator.
Apter Power TB850 3BSC950193R1 Manuals and Guides
Important Notice: The first link is the product-parameters PDF prepared only from the cited manufacturer information; the second link is the Apter Power product manual. Confirm the physical nameplate, current manufacturer documents, and host-system requirements before installation or replacement.
CEX-Bus end termination
Installed on the last unit of an AC 800M CEX-Bus, exactly as required by ABB.
BC810 interconnection assemblies
Used as one of the two TB850 terminators supplied in ABB's BC810K02 CEX-Bus interconnection package.
BC820 redundant-controller interconnection
Used as one of the two TB850 terminators supplied in ABB's BC820K02 CEX-Bus interconnection package.
System 800xA or Compact AC 800M cabinets
Provides the specified end termination in controller communication-bus layouts; it is not an I/O module.
Read and follow the current ABB documentation and host-equipment instructions before work. Verify the complete physical nameplate and system configuration.
1
Verify both TB850 and article number 3BSC950193R1 on the physical label before installation.
2
Install the TB850 only at the last unit on the CEX-Bus, as ABB explicitly requires.
3
Do not substitute TB851: TB850 is DB25P male, while ABB lists TB851 as DB25S female for a different termination position/topology.
4
Secure the screw fixing and inspect the DB25 connector for damage before energizing the controller system.
5
Follow the current ABB AC 800M hardware manual and the project-specific CEX-Bus topology; do not add extra terminators or omit the required end terminator.
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