PM851A-CPU 3BSE066484R1 Processor Unit ABB

Description

PM851A-CPU 3BSE066484R1 is a processor unit designed for industrial automation control applications. This unit features a 24MHz clock frequency, and from version 800xA 5.1 FP4 onwards, it provides 12MB of total memory with 6.253MB of application-accessible RAM, delivering efficient processing performance with a 0.46ms execution time for 1000 Boolean operations. The CPU board integrates a microprocessor, RAM, real-time clock, LED indicators, initialization button, and compact flash interface, while the baseboard offers versatile connectivity: two RJ45 Ethernet ports (CN1, CN2) for control network connections, two RJ45 serial ports (COM3, COM4) where COM3 is an RS-232C port with modem control signals and COM4 is an isolated port for configuration tool connections. It supports configuration via 800xA Control Builder, holds full EMC certification, and is built on standard hardware including Ethernet and Profibus DP for reliable communication. With a modular design that allows gradual expansion, built-in fault diagnosis programs, and an IP20 protection rating, this unit is engineered for stable, scalable operation in automated industrial control systems. It is also associated with part number 07DC92 and brand identifier PM856K01.