GE 90-70 manual Central Processor Unit, Redundancy Communications Module and Cables

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In the unlikely event that a rack failure does occur and is correctly diagnosed, the rack can be replaced with power removed from the system. When the rack is replaced and power restored to the system, the CPU will obtain synchronization with the active system and either take control or become the backup CPU.

Central Processor Unit

If the redundancy CPU fails, the OK light on the CPU will turn off or blink. In addition, fault information will be available in the Fault Table of one or both CPUs.

If the active CPU fails, control is transferred to the backup system. CPU replacement can be accomplished by removing power from the rack and replacing the CPU. When power is returned to the system, the program can be loaded into the CPU and the CPU started. It will then obtain synchronization with the active system and either take control or become the backup CPU.

Redundancy Communications Module and Cables

If a fault is detected in a single Redundancy Communications Module or in its terminated I/O cable, the backup RCM is used. Control does not transfer to the backup CPU. An RCM fault is logged in the PLC Fault Tables of both PLCs. The loss of an RCM is not fatal. If there are expansion racks within a system, and the cable fault is such that the system can no longer communicate to the expansion racks, then the fault is fatal and the PLC is halted. Control then transfers to the backup PLC.

If an RCM fault is detected, proceed as follows:

STOP the unit with the suspected bad RCM.

Turn power off at that rack.

Unplug the terminated cable from the RCM and replace the module.

Reconnect the terminated cable.

Power-up the rack with mode switch in STOP.

Verify that the REMOTE ACTIVE and REMOTE READY LEDs are on. Note that the RCM

TLEDs only update if the board is not faulted. Switch the repaired unit to RUN.

Redundancy Communications Link Failures

There are two types of Redundancy Communications Link failures; a "Link Timeout" and a "Hard Link Failure". When a Link Timeout occurs, the RCM BOARD OK LED remains ON and the LOCAL READY and LOCAL ACTIVE LEDs continue to reflect the status of the Local unit. The REMOTE ACTIVE and REMOTE READY LEDs are not updated by the Remote unit until the link is reinitialized by storing a configuration or power cycling either unit. When a Hard Link Failure occurs, all five RCM LEDs go OFF. A power cycle of the Local unit is required to attempt to reinitialize the failed link.

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Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide – May 2000

GFK-1527A

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Contents GE Fanuc Automation GFL-002 Preface Content of This ManualRelated 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 CPU780Redundancy CPUs as Compared to Other Series 90-70 CPUs Features not Available with Redundancy CPUsDifferences in Operation for Redundancy CPUs Enhanced Redundancy CPU Module Redundancy Communications ModuleRedundant Racks Systems for Enhanced Hot Standby CPU RedundancyLocal I/O Genius I/OCable Connections Enhanced Hot Standby CPU Redundancy System with Local I/O Local I/0 Can beGHS Control Strategy Control StrategiesGDB Control Strategy Output Control with GHS Basic Enhanced Hot Standby OperationOutput 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 ExternalOn-Line Repair Online ProgrammingDuplex CPU Redundancy System Components For Installation InstructionsSystem Racks Features Redundancy CPUCPU Architecture Watchdog TimerExpansion Memory Board CPU Features Memory Protect KeyswitchBattery Connectors CPU LEDsCPU Mode Switch PortRedundancy Communications Module Unit Select PushbuttonConnector RCM Status LedsBus Transmitter Module ConnectorsBus Transmitter Module Status LEDs Cables and Termination Bus Receiver ModuleBus Receiver Module Status LEDs Genius Bus Controller Location of GBCs and BlocksSingle Bus Genius Networks Dual Bus Genius NetworksBus Controller LEDs Configuration Requirements Programmer Connection for ConfigurationOne Application Program in Both PLCs 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 Validating the Backup PLCs Input Scan Backup Qualification with Svcreq #43Validating the Backup PLCs Logic Solution Switching Control to the Backup Unit Switching TimesRUN Disabled Mode for GHS Control Strategy RUN Disabled ModeExample 1 Role switches allowed on both units Example 3 Role switches not allowed on either unit Example 2 Role switches allowed on both unitsExample 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 TimeTimer and PID Function Blocks Miscellaneous Operation InformationTimed Contacts Multiple I/O Scan SetsStop to RUN Mode Transition Sequential Function Chart Programming SFCDebugger 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 Power Supply Maintaining Parallel Bus TerminationOn-Line Repair Recommendations RacksRedundancy Communications Module and Cables Central Processor UnitRedundancy Communications Link Failures Single Bus Networks Bus faults Bus Transmitter ModuleGenius Bus Controller Genius BusDual Bus Networks Genius BlocksSpecifications Cabling InformationIC690CBL714A Multi-drop Cable PurposeConnector a Connector A, 15-pin Female Battery connectors Bus Controller, Genius IndexIndex Online programming Online repair Svcreq
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