When ABB AC800M CEX-Bus communication is being expanded, upgraded, or repaired, the purchasing choice often comes down to a single BC810 module with part number 3BSE031154R1 or a BC810K01 kit. The correct decision depends on whether you are covering one spare position or building a redundant communication path.
What the BC810 Module Does
The ABB BC810 is a CEX-Bus interconnection unit used in AC800M control systems. It provides the physical link between the PM8xx controller and CEX-Bus devices such as communication modules, fieldbus interfaces, and remote I/O units. In redundant controller configurations or high-availability applications, two BC810 units are normally used to maintain CEX-Bus integrity if one module or its path fails.
The single order code 3BSE031154R1 supplies one BC810 unit. It is the correct item when a known single failure has occurred and the system has one spare slot, or when you are building a strategic spare inventory without the immediate need for a full redundant pair.
What the BC810K01 Kit Is
BC810K01 is a kit configured for faster building of a redundant CEX-Bus installation. The kit is not a different module; it is a package of coordinated parts. Depending on the ABB package revision, a BC810K01 kit typically includes two BC810 units, CEX-Bus interconnection cable such as TP857, and CEX-Bus terminator hardware such as TB850.
The kit reduces the risk of incomplete ordering. In a redundant CEX-Bus installation, the module is only half of the requirement. Missing cable, missing termination, or mismatched hardware creates intermittent CEX-Bus faults that are difficult to find after startup.
BC810 vs BC810K01: What Changes in Buying
| Buying element | BC810 3BSE031154R1 single module | BC810K01 kit |
| Module quantity | 1 | Usually 2 |
| CEX-Bus cable | Not included unless ordered separately | TP857 cable normally included or specified |
| CEX-Bus termination | Not included | TB850 terminator normally included |
| Main use | Single module replacement, spare unit | Redundant installation, complete pair replacement |
| Ordering risk | Low unit cost but high risk of missing accessories | Higher initial price but lower assembly risk |
| Spare strategy | Stock one or two loose modules | Keep one kit for complete redundant path |
When to Buy Only the BC810 Single Module
Buy the single BC810 when:
- One BC810 has failed and the other unit is already installed and healthy.
- The existing system has no redundancy and only one module slot is used.
- You are adding a spare module to the store for emergency replacement.
- The project specification allows a single CEX-Bus interconnection unit, and no redundant path is required.
- You already have TP857 cable and TB850 terminator in stock.
Do not buy a single module to replace a redundant pair if the second unit is suspected to be weak or if the failure cause has not been confirmed. Mixing an old module with a new module is usually acceptable if the hardware revision and firmware match, but it can create a troubleshooting point during startup.
When to Buy the BC810K01 Kit
Buy the BC810K01 kit when:
- You are building a new redundant CEX-Bus path from an empty cabinet.
- Both BC810 units in an existing redundant configuration must be replaced.
- The failure is related to cable or termination aging, and you want a new matched set.
- You want to avoid multiple purchase orders for module, cable, and terminator.
- The plant has a scheduled shutdown and needs one package with all mounting and interconnection hardware.
The kit is especially useful for maintenance teams with limited ABB configuration documentation. It converts a multi-line ordering problem into one package, reducing the chance of purchasing a module without the correct CEX-Bus accessories.
Assembly and Installation Checks
The following checks apply whether you install one BC810 or a complete BC810K01 kit.
-
Confirm slot arrangement
The BC810 mounts in the AC800M CEX-Bus rack position according to the controller configuration. Do not install it in a normal S800 I/O slot or a power supply position. -
Verify kit contents before starting
Count two BC810 modules if redundancy is required, one TP857 CEX-Bus cable per connection path, and the TB850 terminator for each open bus end. -
Check connector alignment and board seating
Insert the module straight into the backplane connector. Do not force the module if the board guide or connector is damaged. A bent backplane pin on AC800M CEX-Bus racks can damage the new module. -
Route CEX-Bus cable correctly
Keep TP857 cable away from high-power motor cables, frequency converter output cables, and unshielded contactor wiring. CEX-Bus communication distortion often comes from cable routing, not from the BC810 module itself. -
Terminate the bus at both ends
An unterminated CEX-Bus path is a common source of intermittent fault codes and startup failure. Verify that TB850 termination is installed on the correct open ends and that no extra termination is placed in the middle. -
Check LED and diagnostic indication
After power-up, the BC810 status LED should show normal CEX-Bus activity. If a CEX-Bus fault remains, remove the termination and recheck cable continuity before assuming the module is defective. -
Record the assembly
Save the BC810 part number, revision, serial number, and kit contents into the maintenance record. This helps future purchasing and reduces the chance of ordering the wrong version.
Common Buying and Assembly Mistakes
- Ordering a single BC810 when the system was originally built with a redundant pair, then discovering that no TP857 cable or TB850 terminator was left on site.
- Assuming the BC810K01 kit contains a CPU, power supply, or S800 I/O module. It does not; it is a CEX-Bus interconnection package.
- Installing the module into the wrong rack position and forcing the rear connector.
- Replacing one unit of a redundant pair without checking hardware revision and firmware compatibility.
- Not replacing an aged terminator when replacing modules. An old TB850 with poor contact can produce the same CEX-Bus fault as a failed BC810.
Frequently Asked Questions
What is the difference between BC810 3BSE031154R1 and BC810K01?
The 3BSE031154R1 is a single BC810 module. BC810K01 is a kit, usually containing two BC810 modules plus CEX-Bus interconnection cable and termination hardware. The module hardware is the same; the purchase package is different.
Can I use a BC810K01 kit to replace one failed BC810?
Yes. You can use one module from the kit and keep the second unit as a spare. Before doing this, confirm that the kit module revision matches the existing module installed in the system.
Does the BC810K01 kit always include TP857 and TB850?
Most BC810K01 packages include the required CEX-Bus cable and termination parts, but package contents can vary by region and revision. Always confirm the packing list with the supplier before ordering.
Do I need redundant BC810 units?
If the AC800M system is configured for redundant CEX-Bus operation or high-availability controller operation, yes. For a non-redundant single controller application, a single BC810 may be sufficient.
How do I check if an ABB BC810 is genuine?
Source from a supplier that can provide the original ABB part number, factory packaging, and batch traceability. For replacement procurement, request a clear photo of the module label showing 3BSE031154R1 before shipment.
Sourcing and Delivery Support
For ABB AC800M CEX-Bus spare parts, including BC810 3BSE031154R1, BC810K01 kits, TP857 cable, and TB850 terminator, contact Joyoung International Trading Co., Limited. We support global clients with PLC, DCS, ESD, and vibration monitoring spare parts, module matching, and fast delivery for scheduled and emergency shutdown work.
Email: [email protected]
Phone/WhatsApp: +86-181-5013-7565
View ABB spare parts availability
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