State Industries GFK-0827 manual Genius Bus Controller, Bus Signal Termination, BRM Connectors

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I/O Bus Signal Termination

The I/O bus signals must be terminated at the end of the bus. In a standard PLC system this is done by installing a resistor pack, located inside of a terminator plug (catalog number IC697ACC702) on the bottom connector of the BRM module that is installed in the last I/O expansion rack in the system. In a Hot Standby CPU Redundancy system a special I/O cable with built-in termination is used. Do not use the resistor plug with the terminated cable.

LED Status Indicators

There are three LEDs located at the top of the BRM. The LEDs are labeled: OK, LAST RACK, and BUS ACTIVE. The LEDs are visible through the clear plastic lens at the top of the module's cover. The function of each LED is described below.

Board OK

The top LED, the Board OK LED, is ON when the CPU software completes its power-up configuration of the expansion rack and at least one module in that rack responds to the CPU requests for information. It is OFF when any of these conditions are not met.

Last Rack

The middle LED is the Last Rack LED. This LED is ON when the I/O bus terminator plug is installed in the bottom connector of this BRM, and is Off when it is not installed. The terminator plug is to be installed only on the BRM that is at the end of the expansion rack I/O bus. All BRMs are shipped from the factory with a terminator plug installed. These terminator plugs must be removed from any expansion rack located between the CPU rack and the last expansion rack.

Expansion Bus Active

The bottom LED provides the status of the expansion bus. This LED is ON when the BRM has detected that there has been activity on the expansion bus in the last 500 ms, otherwise it is off. When this LED is OFF, the BRM is holding the Series 90-70 I/O modules in its rack in their default state.

BRM Connectors

The BRM has two connectors mounted on the front of the board. The top connector is for the I/O cable connection to either the lower connector on a BTM in the CPU rack, or to the lower connector on another BRM. The lower connector is for an I/O cable connection to the upper connector of a BRM in the next expansion rack on the I/O bus or to the top connector on an RCM. The I/O cable is an 18 twisted-pair cable with a ground shield. The total maximum cable length from the CPU rack to the most distant expansion rack (at the same ground potential) is 50 feet. Standard parallel I/O bus cables that meet this specification are available in lengths of 5, 10, 25, and 50 feet.

Genius Bus Controller

The Genius Bus Controller (GBC), catalog number IC697BEM731, for the Series 90-70 PLC is the interface for the Series 90-70 PLC to a Genius I/O communications system. Configuration of the GBC is simple through use of Logicmaster 90 Configurator software. Genius I/O blocks are scanned asynchronously by the GBC and I/O data is transferred to the CPU once per scan over the backplane of the Series 90-70 PLC rack.

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

GFK-0827

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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 ProductCable Connections Systems for Hot Standby CPU Redundancy SystemsGenius I/O System Local I/O SystemControl Strategy Basic Hot Standby OperationSynchronized Hot Standby CPU Redundancy System Configuration Redundancy Communications Module Redundancy CPU ModuleEffect on Scan Time Bumpless SwitchingSwitch to Backup Unit Time Synchronized CPUsOn-Line Repair Configurable Backup Data SizeOn-Line Programming Programming Considerations Configuration RequirementsTerm Definition Definition of TermsAcronym Definition Commonly Used AcronymsRedundancy CPU Chapter System ComponentsCapacities for Redundancy CPU, IC697CPU780 Watchdog TimerCPU Architecture Redundancy CPU IC697CPU CPU FeaturesValid Operating Mode Selection CPU Mode SwitchCPU Status LEDs Memor y Protect KeyswitchBattery Connectors Expansion Memory Boards for CPU Serial Port ConnectorExpansion Memory Board Redundancy Communications Module RCM FeaturesBoard OK RCM System Status LedsUnit Selection Pushbutton RCM ConnectorsBus Transmitter Module LED Status IndicatorsBus Receiver Module BTM ConnectorsGenius Bus Controller Bus Signal TerminationBRM Connectors Genius Bus Controller User Features Racks GBC ConnectorsConfiguring a Hot Standby CPU Redundancy System Chapter ConfigurationRedundancy System Requirements Basic Redundancy System SetupLogicmaster 90 Configuration System ConfigurationMonitor or Online mode Screens for Fault Category ConfigurationHandling Folders Configuration with LogicmasterConfiguration of a Redundancy CPU Module GFK-0827 Redundant CPU Requirements Background Window Normal Sweep ModeRedund Type Constant Sweep Mode Constant Window Sweep ModeShared I/O Ctrl StrgyFail Wait 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 DescriptionsOn-Line Repair Recommendations On-Line RepairMaintaining Parallel Bus Termination Redundancy Communications Module and Cables Power SupplyRacks Central Processor UnitGenius Bus Controller Redundancy Communications Link FailuresBus Transmitter Module GeniusBlocks Genius BusRedundancy Alternatives Appendix Redundancy AlternativesRedundancy Option Key See Table PLC RedundancyOptionsSeries 90-70 Redundancy Through Application Logic Index Index Index Index Index
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