TheABB PM861A (3BSE018158R1)is a versatile, high-performance processor unit for the AC 800M control system. Designed for reliability and speed, it features a 48 MHz MPC860 microprocessor and supports CPU redundancy with an ultra-fast switchover time of less than 10 ms. This unit is ideal for industrial applications requiring consistent uptime and robust I/O management.
Technical Specifications
Manufacturer:ABB
Article Number:3BSE018158R1(PM861A)
Processor:MPC860 RISC, 48 MHz
Memory:16 MB SDRAM; 2 MB Flash PROM
Battery Backup:118 hours (internal); supports external SB821/SB822 for extended backup
I/O Capacity:Up to 12 S800 I/O units (via electrical ModuleBus)
Ethernet Ports:2x 10Base-T (CN1, CN2)
Serial Ports:COM3 (RS-232C, modem support), COM4 (Service tool)
Redundancy:CPU redundancy supported (< 10 ms switchover)
Power Supply:24 V DC (19.2–30 V DC)
Weight:1200 g
Key Features
Rapid Redundancy:Provides seamless CPU switchover in under 10 ms, ensuring continuous process control without interruption.
Battery-Backed Security:16 MB of SDRAM is protected by an internal battery, with options for external battery units to extend data retention for weeks.
Integrated Communication:Equipped with dual Ethernet ports for control network connectivity and specialized serial ports for modem and configuration tools.
Efficient Scalability:Directly manages up to 12 S800 I/O modules via the electrical ModuleBus, simplifying local I/O architectures.
Industrial Durability:Low power dissipation (6 W typical) and a wide operating voltage range make it resilient in various factory conditions.
