ABB PM866AK01 3BSE076939R1
Product Overview
The ABB PM866AK01 (3BSE076939R1) is a complete processor unit kit for the ABB AC 800M PAC platform, designed to work with the ABB 800xA process automation system. Delivering 133 MHz processing power paired with 64 MB RAM, this controller executes IEC 61131‑3 control logic, handles S800 I/O data exchange over CEX‑Bus, and manages system‑level communication via dual Ethernet and serial RS‑232 ports. This kit includes CPU hardware, TP830 baseplate, bus terminators and backup battery; software license is sold separately. Widely deployed across chemical plants, power utilities, pulp‑and‑paper and heavy‑industry facilities, it serves as a critical spare for existing AC800M installed‑base upgrades and direct‑replacement projects.
2. Product Core Brief (Snapshot Format)
- Model: PM866AK01
- Part Number: 3BSE076939R1
- Brand: ABB
- Series: AC 800M Process Controller
- Core Function: PAC processor unit, executes IEC‑61131‑3 application logic, handles CEX‑Bus I/O processing, dual‑Ethernet and serial communication for 800xA distributed control system.
- Category: AC800M Processor Unit / PAC CPU Module
- Key Specs: 133 MHz MPC866 processor, 64 MB RAM / 4 MB Flash, dual 10‑Mbit Ethernet, two RS‑232C serial ports, supports up to 96 I/O modules, DIN‑rail slide‑lock mounting, 24 VDC supply, minimum 1 ms task cycle time
- Condition: New Original (New Surplus)
Key Technical Specifications
- Processor: MPC866, 133 MHz clock frequencyABB
- Memory: 64 MB RAM, 4 MB Flash for firmware storage
- Logic Performance: 1000 boolean operations completed within 0.09 ms
- Task Cycle: Minimum 1 ms application cycle
- Communication Ports:
- 2 × RJ45 Ethernet (10 Mbit/s, MMS/IAC protocol)
- COM3: RS‑232C with modem control
- COM4: Galvanically isolated RS‑232C engineering service port
- I/O Capacity: Max 96 local I/O modules for non‑redundant configuration
- Power Supply: 24 VDC (19.2‑30 VDC), typical power consumption 5.1 W
- Mounting: DIN‑rail slide‑lock mechanical structure, TP830 baseplate included
- Kit Contents: PM866A CPU, TP830 baseplate, CEX‑Bus, ModuleBus, RCU‑Link terminators, memory backup battery
- Operating Temperature: 0 °C ~ +55 °C cabinet rating
- Certifications: CE, UL/cUL, ISA‑Secure, RoHS compliant
- Configuration Tool: Compact Control Builder for 800xA platform
- Weight: ~1.2 kg
Typical Application Scope
‑ Medium‑to‑large‑scale process control for chemical and petrochemical plants ‑ Power‑plant auxiliary‑control systems, pulp‑and‑paper manufacturing lines ‑ Industrial facility automation built on ABB 800xA DCS platform ‑ Retrofit and spare‑part replacement for existing AC 800M controller racks ‑ Modular automation projects requiring flexible expansion of S800 series I/O
Maintenance & Inventory Manager Practical Notes
- Common field failure modes: Backup battery depletion causing RAM data loss, Ethernet port surge damage, base‑plate connector oxidation in high‑humidity cabinets, flash‑memory wear from frequent firmware updates.
- Compatibility note: This PM866AK01 delivery is a full kit with baseplate and terminators. Existing spare‑part replacement must match the complete ordering code; terminator omission will trigger CEX‑Bus communication failures. Software license is not included in this part number and needs separate procurement.
- Pre‑shipment test checklist: Verify power‑on LED status indicators, validate dual‑Ethernet port connectivity, test COM4 engineering‑port access, confirm battery health, run program download/upload functional test, complete multi‑hour thermal burn‑in test.
- Spare‑parts stocking strategy: AC800M is a mature‑generation PAC platform; OEM lead times for genuine processor units can be lengthy. Sites running critical production loops should hold matched spare processor kits to reduce plant‑downtime risk.
Critical Installation Pitfalls
‑ Strictly apply ESD anti‑static protection during handling; static discharge can damage CPU internal circuits without visible failure. ‑ Always fit supplied CEX‑Bus / ModuleBus terminators; missing terminators produce unstable I/O bus communication and random module drop‑offs. ‑ This unit does not include application‑software license; confirm license availability before commissioning new spare CPU hardware. ‑ Monitor backup‑battery age regularly; expired battery will lose RAM‑resident data upon power loss. Replace battery strictly per ABB service manual.
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