Back to Basics SM600 Bedienungsanleitung PDF herunterladen (Seite 27)

OVERVIEW

1.1 Features

1 - 5

Overview

Performance

Specification

Sequence Program

Configuration and

Execution Conditions

I/O Nunber Assignment

Memories and Files

Handled by CPU Module

Functions

Communication with

Intelligent Function

Module

Parameters

(4) Enhanced RAS

(a) Enhanced memory diagnostics

The memory diagnostics equipped with the CPU module are enhanced.

(b) Redundant CPU

The CPU module has two CPUs (CPU A and CPU B). The operation results of

CPU A/CPU B are compared, and output only when the results are matched so

that incorrect outputs can be prevented. (When the compared results are

mismatched, the system stops.)

The diagnostic functions of the Table1.3 prevents incorrect outputs when a

hardware error which cannot be detected by the OS occurs.

Figure 1.2 Redundant CPU

Table1.3 Hardware diagnostics function added to the QS series CPU module

Diagnostics Diagnosis Contents

Overvoltage/

undervoltage detection

Overvoltage or undervoltage is detected for the power supply voltage

provided from the power supply module to the CPU module.

Clock stop detection The input clock stop to the CPU module internal circuit is detected.

CPU

Operation

result

Compare

CPU module

Output when matched

Operation

result

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