High-availability controller renewal
Appropriate where the installed BOM calls for the complete redundant package rather than an isolated replacement CPU.
ABB PM891K02 Redundant Processor Unit Kit
ABB PM891K02 redundant processor
ABB PLC processor unit kit
ABB PM891K02 with warranty
Brand Name:
ABB
Model Number:
PM891K02
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Product Details
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ABB PM891K02 redundant processor
,ABB PLC processor unit kit
,ABB PM891K02 with warranty
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Product Description
ABB AC 800M Controller Hardware
PM891K02 Redundant Processor Unit Kit
A factory-defined redundant PM891 package with two processor units plus separate data, control and CEX-Bus interconnection cables.
TypeRedundant Processor Kit
SystemAC 800M / System 800xA
FocusHigh Availability Control
BrandABB
Product Introduction
ABB PM891K02, article 3BSE053242R1, is the redundant PM891 processor package for AC 800M. It combines two PM891K01 units with TK850V007, TK855 and TK856 cables. ABB states that BC810K02 is ordered separately when hot replacement is required.
Core Specifications
| Model / article number | PM891K02 / 3BSE053242R1 |
|---|---|
| Package configuration | Redundant processor kit |
| Processor type / clock | MPC8270 / 450 MHz |
| Performance, 1,000 Boolean operations | 0.043 ms |
| Memory per processor | 256 MB |
| Redundant switch-over | Maximum 10 ms |
| Power supply | 24 VDC; permitted range 19.2–30 VDC |
Package Contents & Hot Replacement
| Processor units | 2 × PM891K01 |
|---|---|
| CEX-Bus cable | 1 × TK850V007 CEX-Bus extension cable |
| Redundancy data link | 1 × TK855 RCU Data Link cable |
| Redundancy control link | 1 × TK856 RCU Control Link cable |
| BC810K02 | Not included |
| Hot replacement requirement | ABB states that BC810K02 must be ordered separately to make PM891 processor hot replacement possible |
Redundancy, Network & I/O Commissioning
01Build both RCU links
Connect TK855 and TK856 exactly as documented; the PM891 uses separate data and control redundancy paths.
02Connect the shared CEX-Bus
Both processors must reach the same expansion bus through the specified cable or the engineered BC810 arrangement.
03Connect redundant S800 I/O
Use optical ModuleBus and two TB840 units. The PM891 has no electrical ModuleBus connection.
Applications & Fault Scenarios
Backup not synchronized
Check both RCU links, firmware alignment, application state and controller diagnostics before testing switch-over.
Hot-replacement planning
Confirm that the separately ordered BC810K02 and site procedure are in place; the package alone does not provide ABB hot replacement.
Additional Specifications
| Built-in backup battery | No |
|---|---|
| Ethernet per processor | 2 × RJ45, 10/100 Mbit/s |
| ModuleBus I/O capacity | Up to 84 modules |
| Dimensions per processor (W × H × D) | 174 × 186 × 94 mm |
| Package weight | 4,000 g |
| Operating temperature | 0 to +55 °C (+32 to +131 °F) |
Official Documentation
- ABB — Compact Product Suite Hardware Selector — PM891K02 Data SheetData sheet dated 2026-01-14 | Article 3BSE053242R1Open official ABB source
- ABB — ABB Ability System 800xA 6.1 — AC 800M Controller Hardware Product Guide3BSE036352-610 A | System version 6.1Open official ABB source
Amikon Service
Commercial supply support, separate from ABB technical documentation.
Part and package checks for planned redundant-controller work.
Identity check
Part number and visible condition reviewed.
Test scope
Available testing stated on the quotation.
Packing & DOA
Protective packing and prompt issue review.
RMA & warranty
Terms confirmed before the order is placed.
Multi-brand Spare Parts Also Requested
XCPBDP00MI-B501AP-IV9907-028NXC1 NetAXS-123eTOP11-0050ML7421B1023ML7425A6008VS-4450EDSC318BRC-H700U1241B/U1242BAE2S-P01
These part numbers are independent purchasing references only. They are not replacements for the product on this page. Compatibility and stock must be confirmed separately for each item.
FAQ
What is included in PM891K02?
Two single-processor packages, one TK850V007 CEX-Bus cable, one TK855 data-link cable and one TK856 control-link cable.
Is BC810K02 included with PM891K02?
No. ABB states that it must be ordered separately when PM891 hot replacement is required.
How are the redundant processors linked in PM891K02?
Use both supplied links: TK855 carries RCU data and TK856 carries RCU control.
How is S800 I/O connected to PM891K02?
Through optical ModuleBus and two TB840 units. The processor has no electrical ModuleBus.
Does PM891K02 have internal backup batteries?
No. Use the approved external battery arrangement where retained-memory backup is required.
What should be included in a PM891K02 RFQ?
Provide the part number, quantity, destination, required date, machine/system model, installed BC810 arrangement, software release and clear labels for both processors.
RFQ for PM891K02
For a faster technical and commercial check, send the installed-part details before the requested ship date.
Email Miya Zheng- Part Number
- Quantity
- Destination
- Required Date
- Machine / System Model
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