State Industries GFK-0827 manual Fault Actions in a CPU Redundancy System

Page 88

4

Fault Actions in a CPU Redundancy System

Fault actions in the Hot Standby CPU Redundancy System are handled differently than those in a non-redundancy (Simplex) system. Whenever there is a ºreadyº backup unit configured in the system, the fault actions in the active unit will not be those normally specified by the user. For an active unit with a ready backup, any fault which will cause a degradation in performance, or loss of control of I/O which does not cause a similar degradation of performance or loss of control of I/O in the backup will be considered a FATAL fault in the active unit and cause the active unit to transition to STOP mode.

The configurable fault actions will be applied whenever the system is running in stand-alone mode in case you prefer fault tolerance (availability) versus safety (depending on the application). The following tables (1) define the Fault Groups and (2) show the fault groups and their fault action defaults. There are three fault actions shown in Table 11: Fatal, Non-Fatal, and Conditionally Fatal. Fatal always stops the PLC, Non-Fatal never stops the PLC and Conditionally Fatal stops the PLC depending on other information in the fault.

Table 9. Maskable Fault Group Descriptions

 

 

Table

 

 

 

Fault Group

Type

Description

 

 

 

 

 

 

 

 

 

 

 

 

LOSS_RACK

CPU

Lossof or Missing Rack

 

 

 

 

 

 

 

LOSS_IOC

I/O

Loss of or Missing IOC

 

 

 

 

 

 

 

LOSS_IO_MOD

I/O

LossoforMissingI/OModule

 

 

 

 

 

 

 

LOSS_OTHR_MOD

CPU

Loss of or Missing Option Module

 

 

 

 

 

 

 

ADD_RCK

CPU

Addition of or Extra Rack

 

 

 

 

 

 

 

ADD_IOC

I/O

Addition of or Extra IOC

 

 

 

 

 

 

 

ADD_IO_MOD

I/O

AdditionoforExtraI/OModule

 

 

 

 

 

 

 

ADD_OTHR_MOD

CPU

Additionof, Reset of, or Extra Option Module

 

 

 

 

 

 

 

IOC_FAULT

I/O

IOC or I/O Bus Fault

 

 

 

 

 

 

 

IO_MOD_FAULT

I/O

I/OModule Fault

 

 

 

 

 

 

 

CNFG_MIS_MTCH

Both

SystemConfigurationMismatch

 

 

 

 

 

 

 

SYS_BUS_ERROR

CPU

System Bus Error

 

 

 

 

 

 

 

CPU_HARDWR

CPU

CPU Hardware Failure

 

 

 

 

 

 

 

MOD_HARDWR

CPU

Module Hardware Failure (e.g. Serial Port Failure on PCM)

 

 

 

 

 

 

 

IOC_SOFTWR

I/O

IOC Software Failure

 

 

 

 

 

 

 

MOD_OTHR SOFTWR

CPU

Option Module Software Failure

 

 

 

 

 

 

 

PRG_BLK_CHKSUM

CPU

ProgramBlockChecksumMismatch

 

 

 

 

 

 

 

LOW_BATTERY

CPU

Low Battery in the System

 

 

 

 

 

 

 

CNST_SW_EXCD

CPU

Constant Sweep Exceeded

 

 

 

 

 

 

 

PLC_FTBL_FULL

CPU

PLC System Fault Table Full

 

 

 

 

 

 

 

IO_FTBL_FULL

CPU

I/OFault Table Full

 

 

 

 

 

 

 

APPLICATION_FLT

CPU

UserApplicationFault

 

 

 

 

 

 

GFK-0827

Chapter 4 Operation

 

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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 TimeOn-Line Programming Configurable Backup Data SizeOn-Line Repair Configuration Requirements Programming ConsiderationsDefinition of Terms Term DefinitionCommonly Used Acronyms Acronym DefinitionChapter System Components Redundancy CPUCPU Architecture Watchdog TimerCapacities for Redundancy CPU, IC697CPU780 CPU Features Redundancy CPU IC697CPUCPU Mode Switch Valid Operating Mode SelectionBattery Connectors Memor y Protect KeyswitchCPU Status LEDs Expansion Memory Board Serial Port ConnectorExpansion 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 ModuleBRM Connectors Bus Signal TerminationGenius 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 Redund Type Normal Sweep ModeBackground Window Constant Window Sweep Mode Constant Sweep ModeFail Wait Ctrl StrgyShared 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 DescriptionsMaintaining Parallel Bus Termination On-Line RepairOn-Line Repair Recommendations Power Supply RacksCentral Processor Unit Redundancy Communications Module and CablesBus Transmitter Module Redundancy Communications Link FailuresGenius 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
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