Introducing the M580 Hot Standby System

Overview

This chapter presents a brief overview of the Modicon M580 Hot Standby system, including:

a description of primary and standby control components
the Hot Standby CPU modules
LEDs and switches
modes of operation

An M580 Hot Standby system is based on two identically configured linked to each other and to the same remote I/O network. If one CPU stops communications, the other assumes control of the I/O system.

What Is in This Chapter?

This chapter contains the following topics:

Primary and Standby PACs
PAC Switchover in an M580 Hot Standby System
Physical Description of M580 Hot Standby CPUs
Standards and Certifications
Hot Standby System States
Configuration Compatibility

CPU

(central processing unit) The CPU, also known as the processor or controller, is the brain of an industrial manufacturing process. It automates a process as opposed to relay control systems. CPUs are computers suited to survive the harsh conditions of the industrial environment.