State Industries GFK-0827 manual Chapter Introduction, Hot Standby CPU Redundancy Product

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Chapter

1

Introduction

This chapter is an introduction to a method of CPU Redundancy for the Series 90-70 Programmable Logic Controller which is referred to as the Hot Standby CPU Redundancy product.

The contents of this chapter provide:

ha basic description of what Hot Standby CPU Redundancy is;

htells what it does for you - the user;

hprovides a basic description of the components of the Hot Standby CPU Redundancy system;

hprovides a basic description of how a system is configured using the Logicmaster 90-70 programming software configurator function;

hlists certain restrictions that you must be aware of;

hand defines terminology unique to this product.

Note

For those who are not familiar with the various redundancy alternatives which may be applied to a Series 90-70 PLC system, please refer to Appendix A before proceeding with this chapter. For those who are familiar with those redundancy alternatives please proceed with the dicussion of the 'Hot Standby CPU Redundancy Productº below.

Hot Standby CPU Redundancy Product

CPU Redundancy for the Series 90-70 Programmable Logic Controller provides a method of allowing a critical application or process to continue operating if a failure occurs in any single component. The CPU Redundancy system described in this guide is the Hot Standby CPU Redundancy product. A Hot Standby CPU Redundancy system consists of two CPUs connected to one or more Genius I/O buses. Each PLC is configured as either Primary or Secondary. The Primary PLC is the preferred PLC and

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Contents GE Fanuc Automation GFL±002 Content of this Manual Related PublicationsPreface We Welcome Your Comments and SuggestionsContents Chapter System Components Chapter Configuration Chapter Operation System Operation Fault Detection and Control Actions Synchronized Hot Standby CPU Redundancy System Configuration Contents Chapter Introduction Hot Standby CPU Redundancy ProductGFK-0827 Features of the Hot Standby CPU Redundancy Product Benefits of the Hot Standby CPU Redundancy ProductSystems for Hot Standby CPU Redundancy Systems Genius I/O SystemLocal I/O System Cable ConnectionsBasic Hot Standby Operation Control StrategySynchronized Hot Standby CPU Redundancy System Configuration Redundancy CPU Module Redundancy Communications ModuleBumpless Switching Switch to Backup Unit TimeSynchronized CPUs Effect on Scan TimeConfigurable Backup Data Size On-Line ProgrammingOn-Line Repair Configuration Requirements Programming ConsiderationsDefinition of Terms Term DefinitionCommonly Used Acronyms Acronym DefinitionChapter System Components Redundancy CPUWatchdog Timer CPU ArchitectureCapacities for Redundancy CPU, IC697CPU780 CPU Features Redundancy CPU IC697CPUCPU Mode Switch Valid Operating Mode SelectionMemor y Protect Keyswitch Battery ConnectorsCPU Status LEDs Serial Port Connector Expansion Memory BoardExpansion Memory Boards for CPU RCM Features Redundancy Communications ModuleRCM System Status Leds Board OKRCM Connectors Unit Selection PushbuttonLED Status Indicators Bus Transmitter ModuleBTM Connectors Bus Receiver ModuleBus Signal Termination BRM ConnectorsGenius Bus Controller Genius Bus Controller User Features GBC Connectors RacksChapter Configuration Configuring a Hot Standby CPU Redundancy SystemBasic Redundancy System Setup Logicmaster 90 ConfigurationSystem Configuration Redundancy System RequirementsScreens for Fault Category Configuration Monitor or Online modeConfiguration with Logicmaster Handling FoldersConfiguration of a Redundancy CPU Module GFK-0827 Redundant CPU Requirements Normal Sweep Mode Redund TypeBackground Window Constant Window Sweep Mode Constant Sweep ModeCtrl Strgy Fail WaitShared I/O Shared I/O Data Parameters Shared I/O Reference ValuesTransfer Data Size Reference Type ReferenceSize CalculationforNumberofBytesConfiguring a CPU Expansion Memory Board Configuration of a Redundancy Communications Module Configuration Configuration of a Genius Bus Controller Paired GBC ParameterSerial Bus Address Configuring a Primary Redundant PLC Select the Redundancy CPU Module Select an Expansion Memory Board Configure the Redundant Communications Module Configure a Genius Bus Controller Configuration Configure Genius I/O Blocks Configure the Bus Transmitter Module Configuring a Secondary Redundant PLC Change Redund Type GFK-0827 Power-Up Sequence of a Redundant CPU Chapter OperationIncompatible Configurations Resynchronization of the Redundant CPU Hot-Standby Redundancy Control Strategy Synchronous Scan First Data Transfer %I, %AI and SynchronizationData Transfer from Backup Unit to Active Unit Switching Control to Backup Unit Second Data Transfer %Q, %AQ, %R, and %MRole Switch Svcreq References for CPU Redundancy Definition for% S Reference for Redundancy StatusRedundancy CPU Considerations RUN Disabled Mode Differences in Operation for CPURUN/ENABLED Locrdy Locact Remrdy Remact Configuration of Fault Actions Stop to RUN Mode Transition Background Window TimeWords per Sweep = Timed Contacts Ovrpre %S ReferenceGenius Bus Controller Switching Fault Detection Fault CategoriesChanging Fault Category Actions PLC Fault Table Fault Zoom Help Text for Redundancy Error CodesFaulting RCMs, Losing Links, and Terminating Communications GFK-0827 Fault Actions in a CPU Redundancy System Maskable Fault Group DescriptionsMaskable Fault Group Actions UserConfigurableNon-Maskable Fault Group Descriptions Non-Maskable Fault Action DescriptionsOn-Line Repair Maintaining Parallel Bus TerminationOn-Line Repair Recommendations Power Supply RacksCentral Processor Unit Redundancy Communications Module and CablesRedundancy Communications Link Failures Bus Transmitter ModuleGenius Bus Controller Genius Bus GeniusBlocksAppendix Redundancy Alternatives Redundancy AlternativesRedundancy Option Key See Table RedundancyOptions PLCSeries 90-70 Redundancy Through Application Logic Index Index Index Index Index