State Industries GFK-0827 manual Transfer Data Size

Page 49

3

Note that the memory for the Shared I/O data that is stored at configuration must be subtracted from the amount of memory on the configured expansion memory module. The calculation for the size of the memory for Shared I/O data is (bytes of Input data transfer plus bytes of Output data transfer plus 8 Kbytes for synchronization information).

For example if the selected expansion memory is 512 Kbytes, and the Shared I/O data is 10 Kbytes of Input data transfer and 20 Kbytes of Output data transfer, then 10K + 20K

+8K Bytes = 38 KBytes is reserved for data transfers. This is subtracted from the 512 KBytes of available user memory (512K ± 38K = 474K Bytes, which means that 474 KBytes is available for the user's control program.

Table 6. Transfer Data Size

Reference Type	ReferenceSize	CalculationforNumberofBytes


If point faults are DISABLED use the following calculations.

%I	Bit	(%I references x 4 bits/reference) ⎟8bits/byte

%AI	Word	(%AIreferencesx2bytes/reference)

%Q	Bit	(%Q references x 4 bits/reference) ⎟8bits/byte

%M	Bit	(%M references x 4 bits/reference) ⎟8bits/byte

%AQ	Word	(%AQ references x 2 bytes/reference)

%R	Word	(%R references x 2 bytes/reference)

If point faults are ENABLED use the following calculations.

%I	Bit	(%I references x 5 bits/reference) ⎟8bits/byte

%AI	Word	(%AIreferencesx3bytes/reference)

%Q	Bit	(%Q references x 5 bits/reference) ⎟8bits/byte

%M	Bit	(%M references x 4 bits/reference) ⎟8bits/byte

%AQ	Word	(%AQ references x 3 bytes/reference)

%R	Word	(%R references x 2 bytes/reference)

Interrupts

Interrupts cannot be ENABLED for Input Modules or VME modules when the configured CPU is a CPU 780. The current configuration will be checked to ensure that there are no modules that have interrupts ENABLED. If modules do exist in the current configuration that have interrupts ENABLED and you configure a CPU 780, a prompt will appear asking whether or not all module interrupts should be DISABLED automatically. You cannot configure a Redundant CPU (CPU 780) until all module interrupts are DISABLED.

38

Series 90-70 Hot Standby CPU Redundancy User's Guide ± December 1993

GFK-0827

Image 49

Contents GE Fanuc Automation GFL±002 Related Publications Content of this ManualWe Welcome Your Comments and Suggestions PrefaceContents Chapter System Components Chapter Configuration Chapter Operation System Operation Fault Detection and Control Actions Synchronized Hot Standby CPU Redundancy System Configuration Contents Hot Standby CPU Redundancy Product Chapter IntroductionGFK-0827 Benefits of the Hot Standby CPU Redundancy Product Features of the Hot Standby CPU Redundancy ProductGenius I/O System Systems for Hot Standby CPU Redundancy SystemsLocal I/O System Cable ConnectionsControl Strategy Basic Hot Standby OperationSynchronized Hot Standby CPU Redundancy System Configuration Redundancy Communications Module Redundancy CPU ModuleSwitch to Backup Unit Time Bumpless SwitchingSynchronized CPUs Effect on Scan TimeOn-Line Programming Configurable Backup Data SizeOn-Line Repair Programming Considerations Configuration RequirementsTerm Definition Definition of TermsAcronym Definition Commonly Used AcronymsRedundancy CPU Chapter System ComponentsCPU Architecture Watchdog TimerCapacities for Redundancy CPU, IC697CPU780 Redundancy CPU IC697CPU CPU FeaturesValid Operating Mode Selection CPU Mode SwitchBattery Connectors Memor y Protect KeyswitchCPU Status LEDs Expansion Memory Board Serial Port ConnectorExpansion Memory Boards for CPU Redundancy Communications Module RCM FeaturesBoard OK RCM System Status LedsUnit Selection Pushbutton RCM ConnectorsBus Transmitter Module LED Status IndicatorsBus Receiver Module BTM ConnectorsBRM Connectors Bus Signal TerminationGenius Bus Controller Genius Bus Controller User Features Racks GBC ConnectorsConfiguring a Hot Standby CPU Redundancy System Chapter ConfigurationLogicmaster 90 Configuration Basic Redundancy System SetupSystem Configuration Redundancy System RequirementsMonitor or Online mode Screens for Fault Category ConfigurationHandling Folders Configuration with LogicmasterConfiguration of a Redundancy CPU Module GFK-0827 Redundant CPU Requirements Redund Type Normal Sweep ModeBackground Window Constant Sweep Mode Constant Window Sweep ModeFail Wait Ctrl StrgyShared I/O Shared I/O Reference Values Shared I/O Data ParametersReference Type ReferenceSize CalculationforNumberofBytes Transfer Data SizeConfiguring a CPU Expansion Memory Board Configuration of a Redundancy Communications Module Configuration Paired GBC Parameter Configuration of a Genius Bus ControllerSerial 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 Chapter Operation Power-Up Sequence of a Redundant CPUIncompatible Configurations Resynchronization of the Redundant CPU Hot-Standby Redundancy Control Strategy First Data Transfer %I, %AI and Synchronization Synchronous ScanData Transfer from Backup Unit to Active Unit Second Data Transfer %Q, %AQ, %R, and %M Switching Control to Backup UnitRole Switch Svcreq Definition for% S Reference for Redundancy Status References for CPU RedundancyRedundancy CPU Considerations Differences in Operation for CPU RUN Disabled ModeRUN/ENABLED Locrdy Locact Remrdy Remact Configuration of Fault Actions Background Window Time Stop to RUN Mode TransitionWords per Sweep = Ovrpre %S Reference Timed ContactsGenius Bus Controller Switching Fault Categories Fault DetectionChanging Fault Category Actions Fault Zoom Help Text for Redundancy Error Codes PLC Fault TableFaulting RCMs, Losing Links, and Terminating Communications GFK-0827 Maskable Fault Group Descriptions Fault Actions in a CPU Redundancy SystemUserConfigurable Maskable Fault Group ActionsNon-Maskable Fault Action Descriptions Non-Maskable Fault Group DescriptionsMaintaining Parallel Bus Termination On-Line RepairOn-Line Repair Recommendations Racks Power SupplyCentral Processor Unit Redundancy Communications Module and CablesBus Transmitter Module Redundancy Communications Link FailuresGenius Bus Controller GeniusBlocks Genius BusRedundancy Alternatives Appendix Redundancy AlternativesRedundancy Option Key See Table PLC RedundancyOptionsSeries 90-70 Redundancy Through Application Logic Index Index Index Index Index