GE 90-70 manual Backup Qualification with Svcreq #43, Validating the Backup PLCs Input Scan

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Example

In the following example, when %M00035 is on, the input and output copies are disabled.

%M00035									%T00041
	MOVE_				MOVE_				SVC_
	INT				INT				REQ
CONST	IN	Q	%L00001	CONST	IN	Q	%L00002	CONST	FNC
00000	LEN			00001	LEN			00043
	LEN				LEN
	00001				00001			%L00001	PARM

Backup Qualification with SVCREQ #43

Service Request function block #43 can be used to help determine if the backup PLC unit is collecting inputs properly (that is, validate the input scan). It can also be used to help determine whether the backup PLC unit is calculating outputs and internal variables properly (that is, validate the logic solution). Instructions are given below.

Validating the Backup PLC's Input Scan

To determine whether the backup PLC is collecting inputs properly, follow these steps:

1.Activate SVCREQ #43 on the backup CPU, passing “0, 1" to disable the input and output data transfer copies.

2.Observe the backup unit's %I and %AI reference tables. The values in these tables correspond to the inputs that the backup is currently collecting.

3.Visually compare the backup unit's %I and %AI reference tables with the active unit's tables. Pay special attention to the %I and %AI references that are configured to be shared between the two units.

4.When you are satisfied that the backup unit is collecting inputs properly, disable the rung that calls SVCREQ #43.

Validating the Backup PLC's Logic Solution

To determine whether the backup PLC is calculating outputs and internal variables properly, follow these steps:

1.Activate SVCREQ #43 on the backup CPU, passing “0, 2" to disable the output data transfer copy.

2.Observe the backup unit's %Q, %AQ, %M, and %R reference tables. The values in these tables correspond to the inputs that the backup is currently calculating.

3.Visually compare the backup unit's %Q, %AQ, %M, and %R reference tables with the active unit's tables. Pay special attention to the %Q, %AQ, %M, and %R references that are configured to be shared between the two units.

4.When you are satisfied that the backup unit is calculating outputs and internal variables properly, disable the rung that calls SVCREQ #43.

GFK-1527A

Chapter 4 Normal Operation

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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