1. General Information

• Manufacturer: ABB (Switzerland)

• Model Number: PM891

• Part Number: 3BSE053240R1

• Product Name: High Performance Processor Unit

• Series: AC 800M DCS Control System

• Module Type: Top-tier High-end Redundant CPU Module

• Application: Ultra-high performance processing unit for large-scale critical industrial control system; applied in main turbine, boiler, petrochemical reactor and heavy industry core control cabinet; suitable for complex interlock, large analog loop and high-speed logic calculation.

• Installation Rule: Installed in high-end AC800M controller rack, dedicated CPU slot

• Compliance: CE, IEC 61508, SIL2 Industrial Safety Certification

2. Functional Description

• Processor Core: PowerPC Architecture High-speed Processor, 450 MHz

• Control Logic: Complex sequence control, mass analog regulation, advanced interlock logic

• Redundancy Function: Dual CPU hot redundant seamless switching (Switching time ≤ 10ms)

• Task Cycle: Minimum 5ms ultra-fast scanning cycle

• Expandability: Supports massive I/O points, large system expansion

3. Electrical Specifications

• Power Supply: 24 VDC ±20% Industrial DC Power

• Power Consumption: ≤ 22 W typical (High power performance)

• Onboard Memory: 256 MB RAM + 128 MB Flash Memory

• Communication Port: Dual Redundant RJ45 Ethernet + 1 Isolated Serial RJ45

• Industrial Protocol: Modbus TCP/IP, Profinet, OPC, Ethernet/IP

• Special Design: No built-in battery, RTC without battery maintenance

• Isolation Voltage: 1500 VAC electrical isolation protection

4. Environmental Specifications

• Operating Temperature: -20 °C ~ +60 °C (-4 °F ~ +140 °F)

• Storage Temperature: -40 °C ~ +85 °C (-40 °F ~ +185 °F)

• Relative Humidity: 5% ~ 95% (Non-condensing)

• Anti-vibration: Compliant with IEC 60068 industrial vibration standard

5. Mechanical Specifications

• Structure: Reinforced metal shell industrial-grade CPU module

• Dimensions (H × W × D): 220 × 95 × 105 mm

• Weight: Approximately 1.05 kg

• Mounting: Standard ABB rack rail installation, hot-swap capable

6. Compatible Devices

• System Rack: High-end AC800M Controller Rack

• Matched Module: SB822 Power Module, TB820 Terminal Base

• Upper Software: ABB Control Builder M Programming Software

7. Key Features

• 450MHz high-frequency processor for ultra-fast complex logic operation

• Dual redundant Ethernet port ensures uninterrupted network communication

• Battery-free design eliminates regular battery replacement maintenance

• Large memory for massive data storage and program operation

• 10ms rapid redundant switching for critical safety production system

8. Core Definition (Most Important Three-Grade CPU Ranking)

• PM825 (Entry): Low-end, Single-core, No Ethernet, No redundancy, Auxiliary system.

• PM866K01 (Mid): Mid-end, Dual-core, Single Ethernet, Redundancy, Main common system.

• PM891 (Top): High-end, 450MHz, Dual Ethernet, Battery-free, Critical core system.