GE 90-70 manual RUN Disabled Mode for GHS Control Strategy

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RUN Disabled Mode

RUN/DISABLED mode causes all physical outputs to go to their default state in that PLC. Inputs are still scanned and logic is solved. A CPU in RUN/DISABLED mode may be the active unit.

RUN Disabled Mode for GHS Control Strategy

There are several guidelines for using RUN/DISABLED mode when using the GHS Control Strategy.

1.If a unit is in RUN/DISABLED mode, its LOC_RDY %S reference and the remote unit's REM_RDY %S reference are not set and the corresponding LEDs on the Redundancy Communications Modules are OFF. This indicates that the unit (with LOC_RDY reference off) is not available to drive outputs.

2.You cannot command a role switch from an active unit that is in RUN/ENABLED mode to a unit that is in RUN/DISABLED mode. The Redundancy Communication Module role switch pushbutton and SVCREQ #26 are ignored if a role switch is attempted in this situation.

3.If the units are transitioned so that the Primary Unit is active with outputs disabled and the Secondary Unit is the backup with outputs enabled, the Primary Unit continues to solve logic and transfer outputs to the backup, and the backup unit drives the transferred outputs.

4.If units are transitioned in any manner where the Secondary Unit is active with outputs disabled and the Primary Unit is the backup with outputs enabled, the units automatically switch roles, so that Primary Unit becomes active in RUN/ENABLED mode.

5.If a unit is in RUN/ENABLED mode and the other unit is in RUN/DISABLED, the unit in RUN/ENABLED does not use its synchronized fault action table. Instead, it uses the user- configurable fault actions since there is no backup available to drive outputs.

Note

If the backup unit is in RUN/DISABLED mode, the backup unit continues to NOT drive outputs upon failure of the active unit and therefore is not a true backup.

Example 1: Role switches allowed on both units

	Primary Unit	Secondary Unit

Role	Active	Backup

Operating Mode	RUN/ENABLED	RUN/ENABLED

OK LED on RCM	ON	ON

LOC_RDY LED on RCM and %S Bit	ON	ON

LOC_ACT LED on RCM and %S Bit	ON	OFF

REM_RDY LED on RCM and %S Bit	ON	ON

REM_ACT LED on RCM and %S Bit	OFF	ON

GFK-1527A

Chapter 4 Normal Operation

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Contents GE Fanuc Automation GFL-002 Content of This Manual PrefaceRelated Publications Preface Contents Contents Chapter Fault Detection Appendix a Cabling Information Introduction Definition of TermsEnhanced Hot Standby CPU Redundancy Using the Redundancy CPU for Non-Redundant Operation Compatibility with CPU780Features not Available with Redundancy CPUs Redundancy CPUs as Compared to Other Series 90-70 CPUsDifferences in Operation for Redundancy CPUs Redundant Racks Enhanced Redundancy CPU ModuleRedundancy Communications Module Systems for Enhanced Hot Standby CPU RedundancyGenius I/O Local I/OCable Connections Enhanced Hot Standby CPU Redundancy System with Local I/O Local I/0 Can beControl Strategies GHS Control StrategyGDB Control Strategy Basic Enhanced Hot Standby Operation Output Control with GHSOutput Control with GDB Basic CPU Redundancy Setups Single Bus with Preferred Master GHS Control StrategySingle Bus with Floating Master GDB Control Strategy Critical Data + Redundant Outputs TransferredDual Bus with Floating Master GDB Control Strategy Paired GBC = INT/EXT Internal ExternalOnline Programming On-Line RepairDuplex CPU Redundancy For Installation Instructions System ComponentsSystem Racks Features Redundancy CPUWatchdog Timer CPU ArchitectureExpansion Memory Board Battery Connectors CPU FeaturesMemory Protect Keyswitch CPU LEDsCPU Mode Switch PortRedundancy Communications Module Unit Select PushbuttonConnector RCM Status LedsConnectors Bus Transmitter ModuleBus Transmitter Module Status LEDs Bus Receiver Module Cables and TerminationBus Receiver Module Status LEDs Genius Bus Controller Location of GBCs and BlocksSingle Bus Genius Networks Dual Bus Genius NetworksBus Controller LEDs One Application Program in Both PLCs Configuration RequirementsProgrammer Connection for Configuration Program Folders in Control Programming SoftwareCPU Configuration Parameters Program Folders in LogicmasterConfiguring Shared I/O References Parameter Default Range DescriptionFinding the Memory Available for Application Program Storage System Communications Window ConsiderationsRack Module Configuration Parameters Bus Controller Configuration ParametersGenius I/O Block Configuration Parameters Normal Operation Powerup of a Redundant CPU Incompatible Configurations Resynchronization of a Redundant CPUGHS Control Strategy GDB Control StrategyReferences for CPU Redundancy Ovrpre %S Reference Not AvailableScan Synchronization Sweep Time SynchronizationOutput Data Transfer to the Backup Unit AT aData Transfer Time Fail Wait TimeGFK-1527A Normal Operation Programming a Data Transfer from Backup Unit to Active Unit Data Transfer ExampleDisabling Data Transfer Copy in Backup Unit Svcreq #43 Command Block for Svcreq #43 Backup Qualification with Svcreq #43 Validating the Backup PLCs Input ScanValidating the Backup PLCs Logic Solution Switching Control to the Backup Unit Switching TimesRUN Disabled Mode RUN Disabled Mode for GHS Control StrategyExample 1 Role switches allowed on both units Example 2 Role switches allowed on both units Example 3 Role switches not allowed on either unitExample 4 Role switches allowed on both units Backup Active RUN Disabled Mode for GDB Control Strategy Example 8 InvalidFinding the Words to Checksum Each Sweep CGR772 CGR935Finding the Background Window Time Finding the Total Sweep TimeTimed Contacts Timer and PID Function BlocksMiscellaneous Operation Information Multiple I/O Scan SetsDebugger Stop to RUN Mode TransitionSequential Function Chart Programming SFC Background Window TimeGenius Bus Controller Switching Ethernet Global Data in a Redundancy CPU Ethernet Global Data ConsumptionEthernet Global Data Production Sntp TimestampingFault Detection Configuration of Fault ActionsFault Detection PLC Fault Table Messages for Redundancy Message Fault Description Corrective ActionWith redundancy in other fault groups Fault Response Faulting the Redundancy Communications Module Losing a LinkFault Actions in a CPU Redundancy System Configurable Faults Fault Group Type DescriptionNon-Configurable Fault Group Fatal Faults on Both Units in the Same SweepOn-Line Repair On-Line Repair Recommendations Power SupplyMaintaining Parallel Bus Termination RacksCentral Processor Unit Redundancy Communications Module and CablesRedundancy Communications Link Failures Genius Bus Controller Single Bus Networks Bus faultsBus Transmitter Module Genius BusDual Bus Networks Genius BlocksIC690CBL714A Multi-drop Cable SpecificationsCabling Information PurposeConnector a Connector A, 15-pin Female Battery connectors Bus Controller, Genius IndexIndex Online programming Online repair Svcreq