Controller renewal
A maintenance team may source a verified single-processor package for an installed PM891 position or for a separately engineered redundant pair.
ABB PM891K01 Processor Unit
ABB PM891K01 processor unit
ABB PLC processor module
PM891K01 industrial control unit
Brand Name:
ABB
Model Number:
PM891K01
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Product Details
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ABB PM891K01 processor unit
,ABB PLC processor module
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Product Description
ABB AC 800M Controller Hardware
PM891K01 Processor Unit
A single PM891 processor package for high-performance AC 800M control, Control Network communication and optical S800 I/O integration.
TypeSingle Processor Package
SystemAC 800M / System 800xA
FocusHigh-Performance Control
BrandABB
Product Introduction
ABB PM891K01, article 3BSE053241R1, is a single AC 800M processor package for high-performance control, Control Network communication and optical S800 I/O. It is a self-contained processor unit and does not use the TP830 baseplate found on other PM8xx families.
Core Specifications
| Model / article number | PM891K01 / 3BSE053241R1 |
|---|---|
| Package configuration | Single processor unit |
| Processor type / clock | MPC8270 / 450 MHz |
| Performance, 1,000 Boolean operations | 0.043 ms |
| Memory | 256 MB |
| Application program cycle time | Down to 1 ms |
| Power supply | 24 VDC; permitted range 19.2–30 VDC |
Network, I/O & Configuration
01Control Network
Use CN1 for a single network. Use CN1 and CN2 when the controller is engineered for a redundant Control Network.
02S800 I/O
The unit has optical ModuleBus only. It supports seven clusters, each with up to twelve modules; redundant and non-redundant modules may be mixed within ABB limits.
03CEX-Bus expansion
Communication interfaces are added on the CEX-Bus. ABB specifies up to twelve interfaces; BC810 can divide the bus into independent segments.
Battery & Redundancy Planning
The PM891 has no internal battery. If retained memory requires battery support, engineer the ABB external battery option and include its condition in the maintenance plan.
For processor redundancy, ABB uses two separate links: TK855 for RCU data and TK856 for RCU control. The redundant arrangement also connects both processors to the same CEX-Bus and uses optical ModuleBus with two TB840 units for S800 I/O.
K01 identifies the single-processor package. Do not treat a second loose CPU as a complete redundant conversion without checking the ABB redundancy cables, CEX-Bus arrangement, I/O connection and project configuration.
Applications & Fault Scenarios
Control Network loss
Check CN1/CN2 cabling, switch path, hardware address records and controller status before replacing the processor.
Application will not load
Compare the installed System 800xA/Control Builder release, CPU firmware and project hardware definition before another download attempt.
Additional Specifications
| Current consumption at 24 VDC | 660 mA typical / 750 mA maximum |
|---|---|
| External backup option | SB822; ABB states at least 33 hours when fully charged |
| Ethernet channels / speed | 2 × RJ45, 10/100 Mbit/s |
| ModuleBus I/O capacity | Up to 84 modules |
| Dimensions (W × H × D) | 174 × 186 × 94 mm |
| Operating temperature | 0 to +55 °C (+32 to +131 °F) |
Official Documentation
- ABB — Compact Product Suite Hardware Selector — PM891K01 Data SheetData sheet dated 2026-02-05 | Article 3BSE053241R1Open 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.
Warehouse handling for planned automation spare shipments.
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
Is PM891K01 a redundant processor package?
No. It is the single-processor package. The hardware supports redundancy only when a second processor and the specified ABB links, bus hardware and project configuration are added.
Does PM891K01 use a TP830 baseplate?
No. The processor is a monolithic unit with integrated termination.
How is S800 I/O connected to PM891K01?
Through optical ModuleBus. The verified limit is seven clusters and a maximum of 84 modules.
Does PM891K01 have an internal backup battery?
No. Use the ABB external battery arrangement when retained-memory backup is required.
Which service port is available on PM891K01?
COM4 is an isolated RS-232C service interface at 9,600 baud; COM3 is not supported.
What should be included in a PM891K01 RFQ?
Provide the part number, quantity, destination, required date, machine/system model, installed firmware or System 800xA release, and clear nameplate photos.
RFQ for PM891K01
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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