GE 90-70 manual Cables and Termination, Bus Receiver Module Status LEDs

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Bus Receiver Module

The Bus Receiver Module (BRM), catalog number IC697BEM711, is the expansion rack interface to the I/O bus. The Bus Receiver Module connects to a Bus Transmitter Module in rack 0 or to a Bus Receiver Module in the previous rack via a parallel I/O bus cable.

In a CPU Redundancy system with expansion racks, the last bus connection is to a Redundancy Communications Module, as explained previously.

Connectors

The top connector on the Bus Receiver Module is for connection to the previous Bus Transmitter or Bus Receiver Module.

The lower connector on the Bus Receiver Module is for connection to the upper connector of a Bus Receiver Module in the next expansion rack or to the upper connector of a Redundancy Communications Module.

LEDs

BOARD OK LAST RACK BUS ACTIVE

Cables and Termination

In an expansion I/O system, the cable between Bus Transmitter/Receiver modules 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.

In a non-redundant PLC system, this bus must be terminated using terminator plug (IC697ACC702) on the bottom connector of the last Bus Receiver. All BRMs are shipped from the factory with a terminator plug installed. For a redundant PLC system, these terminator plugs must be removed from all BRMs.

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.

Connector to Previous BTM or BRM

Connector to Redundancy Communications Module or Bus Receiver Module

Bus Receiver Module Status LEDs

Board OK: The top LED is ON when the CPU 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 ON when the terminator plug is installed in the bottom connector of this Bus Receiver Module and is Off when it is not installed.

Expansion Bus Active: The bottom LED ON indicates activity on the expansion bus in the last 500 ms. Otherwise it is off and I/O modules in the rack are held in their default state.

GFK-1527A

Chapter 2 System Components

2-9

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Contents GE Fanuc Automation GFL-002 Content of This Manual PrefaceRelated 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 CPU780Features not Available with Redundancy CPUs Redundancy CPUs as Compared to Other Series 90-70 CPUsDifferences in Operation for Redundancy CPUs Redundant Racks Enhanced Redundancy CPU ModuleRedundancy Communications Module Systems for Enhanced Hot Standby CPU RedundancyGenius I/O Local I/OCable Connections Enhanced Hot Standby CPU Redundancy System with Local I/O Local I/0 Can beControl Strategies GHS Control StrategyGDB Control Strategy Basic Enhanced Hot Standby Operation Output Control with GHSOutput 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 ExternalOnline Programming On-Line RepairDuplex CPU Redundancy For Installation Instructions System ComponentsSystem Racks Features Redundancy CPUWatchdog Timer CPU ArchitectureExpansion Memory Board Battery Connectors CPU FeaturesMemory Protect Keyswitch CPU LEDsCPU Mode Switch PortRedundancy Communications Module Unit Select PushbuttonConnector RCM Status LedsConnectors Bus Transmitter ModuleBus Transmitter Module Status LEDs Bus Receiver Module Cables and TerminationBus Receiver Module Status LEDs Genius Bus Controller Location of GBCs and BlocksSingle Bus Genius Networks Dual Bus Genius NetworksBus Controller LEDs One Application Program in Both PLCs Configuration RequirementsProgrammer Connection for Configuration 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 Backup Qualification with Svcreq #43 Validating the Backup PLCs Input ScanValidating the Backup PLCs Logic Solution Switching Control to the Backup Unit Switching TimesRUN Disabled Mode RUN Disabled Mode for GHS Control StrategyExample 1 Role switches allowed on both units Example 2 Role switches allowed on both units Example 3 Role switches not allowed on either unitExample 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 TimeTimed Contacts Timer and PID Function BlocksMiscellaneous Operation Information Multiple I/O Scan SetsDebugger Stop to RUN Mode TransitionSequential Function Chart Programming SFC 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 On-Line Repair Recommendations Power SupplyMaintaining Parallel Bus Termination RacksCentral Processor Unit Redundancy Communications Module and CablesRedundancy Communications Link Failures Genius Bus Controller Single Bus Networks Bus faultsBus Transmitter Module Genius BusDual Bus Networks Genius BlocksIC690CBL714A Multi-drop Cable SpecificationsCabling Information PurposeConnector a Connector A, 15-pin Female Battery connectors Bus Controller, Genius IndexIndex Online programming Online repair Svcreq
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