GE 90-70 manual Bus Transmitter Module, Genius Bus Controller, Single Bus Networks Bus faults

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5

Bus Transmitter Module

A fault in the Bus Transmitter Module is treated just like a fault in the Redundancy Communications Module. It is only fatal if the fault prevents communications to any expansion racks within the system.

Failure of the Bus Transmitter Module may not easily be distinguished from a Redundancy Communications cable failure or even an RCM failure. However, most failure modes of the Bus Transmitter Module can be isolated to the BTM. When a Bus Transmitter Module fails, the system responds as described for the Redundancy Communications Module and cable failure. It only faults the PLC if the PLC has expansion racks installed.

The Bus Transmitter Module can be replaced by removing power from the rack and replacing the module. When power is restored to the CPU, the CPU obtains synchronization with the active system and either takes control or becomes the backup CPU.

Genius Bus Controller

In a synchronized CPU Redundancy system, all GBC faults are considered fatal. Failure of a Genius Bus Controller is detected and isolated by the PLC. If a Genius Bus Controller fails in the active PLC, the active PLC goes to STOP/FAULT mode and the backup assumes control.

The Genius Bus Controller can be replaced by removing power from the rack and replacing the module. When power is restored to the CPU, the CPU obtains synchronization with the active system and either takes control or becomes the backup CPU.

Genius Bus

For both single and dual bus Genius networks, Genius bus faults are not fatal to the PLC.

However, if a bus fault exists, it exists for both units.

Single Bus Networks Bus faults

For single bus Genius networks, there may be situations where Genius bus faults are not fatal to the PLC. However, if a bus fault exists, it exists for both systems. There may be situations where one controller can communicate to more blocks than the other controller can. The blocks will choose which controller to respond to, if either can be heard.

The Genius bus can be repaired without disturbing power to either system and thus without disturbing whichever PLC is in control of the process. Replacement of a bus can be done on line but is not recommended because all devices on that bus will be lost until the bus is repaired.

GFK-1527A

Chapter 5 Fault Detection

5-13

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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 Definition of Terms IntroductionEnhanced Hot Standby CPU Redundancy Compatibility with CPU780 Using the Redundancy CPU for Non-Redundant OperationDifferences in Operation for Redundancy CPUs Features not Available with Redundancy CPUsRedundancy CPUs as Compared to Other Series 90-70 CPUs Redundancy Communications Module Enhanced Redundancy CPU ModuleRedundant Racks Systems for Enhanced Hot Standby CPU RedundancyCable Connections Genius I/OLocal I/O Local I/0 Can be Enhanced Hot Standby CPU Redundancy System with Local I/OGDB Control Strategy Control StrategiesGHS Control Strategy Output Control with GDB Basic Enhanced Hot Standby OperationOutput Control with GHS Single Bus with Preferred Master GHS Control Strategy Basic CPU Redundancy SetupsCritical Data + Redundant Outputs Transferred Single Bus with Floating Master GDB Control StrategyPaired GBC = INT/EXT Internal External Dual Bus with Floating Master GDB Control StrategyDuplex CPU Redundancy Online ProgrammingOn-Line Repair System Racks For Installation InstructionsSystem Components Redundancy CPU FeaturesExpansion Memory Board Watchdog TimerCPU Architecture Memory Protect Keyswitch CPU FeaturesBattery Connectors CPU LEDsPort CPU Mode SwitchUnit Select Pushbutton Redundancy Communications ModuleRCM Status Leds ConnectorBus Transmitter Module Status LEDs ConnectorsBus Transmitter Module Bus Receiver Module Status LEDs Bus Receiver ModuleCables and Termination Location of GBCs and Blocks Genius Bus ControllerDual Bus Genius Networks Single Bus Genius NetworksBus Controller LEDs Programmer Connection for Configuration Configuration RequirementsOne Application Program in Both PLCs Program Folders in Control Programming SoftwareProgram Folders in Logicmaster CPU Configuration ParametersParameter Default Range Description Configuring Shared I/O ReferencesSystem Communications Window Considerations Finding the Memory Available for Application Program StorageBus Controller Configuration Parameters Rack Module Configuration ParametersGenius I/O Block Configuration Parameters Normal Operation Powerup of a Redundant CPU Resynchronization of a Redundant CPU Incompatible ConfigurationsGDB Control Strategy GHS Control StrategyOvrpre %S Reference Not Available References for CPU RedundancySweep Time Synchronization Scan SynchronizationAT a Output Data Transfer to the Backup UnitFail Wait Time Data Transfer TimeGFK-1527A Normal Operation Data Transfer Example Programming a Data Transfer from Backup Unit to Active UnitDisabling 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 Times Switching Control to the Backup UnitExample 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 Example 8 Invalid RUN Disabled Mode for GDB Control StrategyCGR772 CGR935 Finding the Words to Checksum Each SweepFinding the Total Sweep Time Finding the Background Window TimeMiscellaneous Operation Information Timer and PID Function BlocksTimed Contacts Multiple I/O Scan SetsSequential Function Chart Programming SFC Stop to RUN Mode TransitionDebugger Background Window TimeGenius Bus Controller Switching Ethernet Global Data Consumption Ethernet Global Data in a Redundancy CPUSntp Timestamping Ethernet Global Data ProductionConfiguration of Fault Actions Fault DetectionFault Detection Message Fault Description Corrective Action PLC Fault Table Messages for RedundancyWith redundancy in other fault groups Fault Response Losing a Link Faulting the Redundancy Communications ModuleFault Actions in a CPU Redundancy System Fault Group Type Description Configurable FaultsFatal Faults on Both Units in the Same Sweep Non-Configurable Fault GroupOn-Line Repair Maintaining Parallel Bus Termination Power SupplyOn-Line Repair Recommendations RacksRedundancy Communications Link Failures Central Processor UnitRedundancy Communications Module and Cables Bus Transmitter Module Single Bus Networks Bus faultsGenius Bus Controller Genius BusGenius Blocks Dual Bus NetworksCabling Information SpecificationsIC690CBL714A Multi-drop Cable PurposeConnector a Connector A, 15-pin Female Index Battery connectors Bus Controller, GeniusIndex Online programming Online repair Svcreq