ABB PM891K01 PM891K02 AC 800M High-Performance Redundant Processor Units

Next-Generation Control for System 800xA and Industrial Process Automation

Product Family: ABB AC 800M

Models: PM891K01 (Base Unit) | PM891K02 (Redundant Kit)

Order Codes: 3BSE053241R1 (PM891K01) | 3BSE053242R1 (PM891K02)

Brand: ABB

Type: High-Performance Process Controller / Redundant Processor Unit

Product Overview

The ABB PM891K01 and PM891K02 represent the high-performance backbone of the ABB AC 800M controller family, specifically designed for the System 800xA and Compact Product Suite automation platforms.

Engineered for mission-critical applications, these monolithic processor units combine robust processing power with flexible modularity. The PM891K01 serves as a standalone high-capacity CPU, while the PM891K02 is a factory-engineered Redundant Kit containing two PM891K01 units plus synchronization cables, offering seamless "bumpless" transfer for maximum system uptime .

Key Features & SEO Keywords

High-Performance Processing: Powered by a 450 MHz MPC8270 CPU with 256 MB of RAM (208.985 MB available for application logic) .

CPU Redundancy Support (PM891K02): Designed for hot-standby configurations. If the primary unit fails, the secondary unit takes over instantly without process interruption .

Dual Ethernet Connectivity: Features two RJ45 ports (10/100 Mbps) for connection to the Control Network, supporting MMS and IAC protocols for high-speed data exchange .

Expansion Capabilities (CEX-Bus): Supports up to 12 communication expansion modules (e.g., Profibus DP, Modbus, Ethernet/IP) via the built-in CEX-Bus .

Extensive I/O Capacity: Connects up to 7 clusters of S800 I/O units (optical Modulebus) or 12 units per cluster, totaling up to 84 I/O modules per controller .

No Internal Battery: Maintenance-free operation; uses a real-time clock with 50 ppm stability (~0.5 hours/year drift) .

Hot Swappable (with BC810): Requires the BC810K02 CEX-Bus Interconnection unit for live replacement in redundant setups .

Technical Specifications (Datasheet)

Specification PM891K01 (Standalone) PM891K02 (Redundant Kit)

Order Code 3BSE053241R1 3BSE053242R1

Processor MPC8270 @ 450 MHz Dual MPC8270 @ 450 MHz

Memory (RAM) 256 MB 2 x 256 MB

Application RAM ~208 MB ~208 MB per unit

Performance 0.043 ms / 1000 boolean ops Same (Redundant Logic)

Redundancy Optional (Requires second unit) Included (Hot Standby)

Ethernet Ports 2 x RJ45 (10/100 Mbps) 4 x RJ45 (2 per CPU)

Service Port 1 x RJ45 (COM4 - Isolated) 1 x RJ45 per CPU

CEX-Bus Slots Up to 12 Modules Up to 12 Modules

I/O Capacity 7 S800 Clusters (84 modules) 7 S800 Clusters (84 modules)

Hot Swap Yes (Requires BC810K02) Yes (Requires BC810K02)

Dimensions (HxWxD) 186 x 174 x 94 mm Kit: 2 units + cables

Weight ~2 kg ~4 kg (Kit total)

Operating Temp 0°C to +60°C 0°C to +60°C

Protection Rating IP20 IP20

PM891K02 Kit Contents

The redundant kit includes:

2 x PM891K01 Processor Units

1 x TK850V007 CEX-bus Extension Cable

1 x TK855 RCU Data Link Cable

1 x TK856 RCU Control Link Cable

(Note: BC810K02 is required for hot replacement and must be ordered separately) .

Applications & Use Cases

The ABB PM891 series is ideal for high-availability processes where downtime results in significant financial loss or safety risks:

Oil & Gas: Pipeline monitoring, refinery process control, and offshore platform automation.

Power Generation: Turbine control, balance of plant (BOP), and substation automation (IEC 61850).

Chemical & Pharmaceutical: Batch processing, reactor control, and regulatory compliance.

Water & Wastewater: Large-scale treatment plant SCADA integration and pump sequencing.

Manufacturing: Automotive powertrain assembly and material handling systems.

Why Choose PM891K01/K02?

Compared to older AC 800M models (PM861, PM864, PM866), the PM891 series offers a higher clock speed (450 MHz) and larger memory (256 MB), making it suitable for complex calculations and large data logging. The PM891K02 specifically provides a factory-tested redundancy package, eliminating configuration guesswork and ensuring immediate high-availability .

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