GE 90-70 manual References for CPU Redundancy, Ovrpre %S Reference Not Available

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portion of the bus between the BSM and the blocks) result in loss of the blocks downstream from the failure on that bus stub.

Bus failures in single bus networks result in loss of the blocks downstream from the bus failure.

When using the GDB control strategy, the user is required to transfer all redundant Genius outputs to the backup unit so that both units drive the same output values.

%S References for CPU Redundancy

%S33 through %S39 and %SB18 reflect the status of the Redundancy units. The table below describes these %S references, and shows their expected states in the Primary and Secondary Units, assuming Primary is active and Secondary is backup.

 

 

 

 

Expected State

%S Bit

Definition

Nickname

Description

 

 

Primary

Secondary

 

 

 

 

 

 

 

 

Unit

Unit

 

 

 

 

 

 

%S33

Primary Unit

PRI_UNT

Set if the local unit is configured as the primary unit:

ON

OFF

 

 

 

otherwise; it is cleared. For any given local unit, if

 

 

 

 

 

PRI_UNT is set, then SEC_UNT cannot be set.

 

 

 

 

 

 

 

 

%S34

Secondary Unit

SEC_UNT

Set if the local unit is configured as the secondary unit:

OFF

ON

 

 

 

otherwise; it is cleared. For any given local unit, if

 

 

 

 

 

SEC_UNT is set, then PRI_UNT cannot be set.

 

 

 

 

 

 

 

 

%S35

Local System

LOC_RDY

Set if local unit is ready to become the active unit;

ON

ON

 

Ready

 

otherwise it is cleared.

 

 

 

 

 

 

 

 

%S36

Local System

LOC_ACT

Set if local unit is currently the active unit; otherwise it is

ON

OFF

 

Active

 

cleared. For any given local unit, if LOC_ACT is set, then

OFF (1)

ON (1)

 

 

 

REM_ACT cannot be set.

 

 

 

 

 

 

 

 

 

 

 

%S37

Remote System

REM_RDY

Set if remote unit is ready to become the active unit;

ON

ON

 

Ready

 

otherwise it is cleared.

 

 

 

 

 

 

 

 

%S38

Remote System

REM_ACT

Set if remote unit is currently the active unit; otherwise it is

OFF

ON

 

Active

 

cleared. For any given local unit, if REM_ACT is set, then

ON (1)

OFF (1)

 

 

 

LOC_ACT cannot be set.

 

 

 

 

 

 

 

 

 

 

 

%S39

Logic Equal

LOGICEQ

Set if the logic program for both units in the redundant

ON

ON

 

 

(LOGIC=)

system is the same; otherwise the bit is cleared.

 

 

 

 

 

 

 

 

%SB18

Redundant

RDN_MSG

Set if a redundant informational message was logged. It can be cleared in reference tables,

 

Informational

 

logic, or by clearing the fault tables.

 

 

 

Message, Fault

 

 

 

 

 

Logged

 

 

 

 

 

 

 

 

 

 

(1) Condition if secondary is active unit.

%S references can be read from the application program, but cannot be altered or overridden. These references are always OFF when no configuration has been stored. Once you have completed configuration of the Redundancy system and STORED the configuration, the state of these %S references is set and is maintained in STOP or RUN mode.

References %S35, %S36, %S37, and %S38 correspond to LEDs on the Redundancy Communications Module. External indicators can also be used to monitor the status of %S35 through %S38 (Local Ready/Active, Remote Ready/Active) through the application program logic.

OVR_PRE %S Reference Not Available

The OVR_PRE %S reference which indicates whether one or more overrides is active is not supported by the Redundancy CPU and should not be used.

GFK-1527A

Chapter 4 Normal Operation

4-5

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Contents GE Fanuc Automation GFL-002 Related Publications Content of This ManualPreface 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 CPU780Differences in Operation for Redundancy CPUs Features not Available with Redundancy CPUsRedundancy CPUs as Compared to Other Series 90-70 CPUs Enhanced Redundancy CPU Module Redundancy Communications ModuleRedundant Racks Systems for Enhanced Hot Standby CPU RedundancyCable Connections Genius I/OLocal I/O Enhanced Hot Standby CPU Redundancy System with Local I/O Local I/0 Can beGDB Control Strategy Control StrategiesGHS Control Strategy Output Control with GDB Basic Enhanced Hot Standby OperationOutput Control with GHS 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 ExternalDuplex CPU Redundancy Online ProgrammingOn-Line Repair System Racks For Installation InstructionsSystem Components Features Redundancy CPUExpansion Memory Board Watchdog TimerCPU Architecture CPU Features Memory Protect KeyswitchBattery Connectors CPU LEDsCPU Mode Switch PortRedundancy Communications Module Unit Select PushbuttonConnector RCM Status LedsBus Transmitter Module Status LEDs ConnectorsBus Transmitter Module Bus Receiver Module Status LEDs Bus Receiver ModuleCables and Termination 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 Logic Solution Backup Qualification with Svcreq #43Validating the Backup PLCs Input Scan Switching Control to the Backup Unit Switching TimesExample 1 Role switches allowed on both units RUN Disabled ModeRUN Disabled Mode for GHS Control Strategy Example 4 Role switches allowed on both units Example 2 Role switches allowed on both unitsExample 3 Role switches not allowed on either unit 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 Link Failures Central Processor UnitRedundancy Communications Module and Cables 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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