Technical Overview

The AC 800M Controller is a modular, rail-mounted control platform composed of multiple integrated units including:

CPU processors

Communication interface modules

Power supply modules

CEX-Bus expansion units

I/O subsystem accessories

The PM864A is one of the high-performance processors in the AC 800M family, offering advanced computing power, large memory capacity, and full redundancy support for critical industrial applications.

CPU and Communication Interfaces

Each PM864A CPU module includes:

Two built-in Ethernet ports (CN1, CN2)
Used for controller-to-controller communication, operator stations, engineering tools, and networked I/O.
Supports redundant network topologies.

Two RS-232C serial ports (COM3, COM4)

COM3: RS-232C with modem control signals for point-to-point communication

COM4: Isolated RS-232C interface for programming, diagnostics, or connection to third-party equipment

These interfaces allow the controller to communicate with:

SCADA / HMI systems

Engineering workstations

Third-party automation devices

Peer AC 800M controllers

Typical Applications

The PM864A redundant controller is suitable for high-availability industrial systems such as:

Power generation and turbine control

Petrochemical and chemical process automation

Substation automation

Metallurgical and large manufacturing lines

Critical infrastructure requiring fault-tolerant controllers

Its dual-CPU redundancy capability ensures continuous operation and high system reliability for demanding industrial environments.