GE 90-70 manual CPU Features, Memory Protect Keyswitch, CPU LEDs, Battery Connectors

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CPU Features

Memory Protect Keyswitch

The Memory Protect keyswitch can be used to manually lock program and configuration data from access by a remote programmer (serial or Ethernet). When the key is in the ON position, program and configuration data can only be changed by a programmer connected to the Bus Transmitter Module.

	CPU LEDs	OK	P1
	CPU LEDs	RUN	P2
		RUN	P2
		EN	P3

MEM PROTECT

OK: The OK LED is ON when the CPU is functioning properly. The OK LED blinks when the CPU executes power-up diagnostics, when the remote unit is powered-up, or if the system has failed. If the system has failed and the OK LED is blinking, the CPU can still communicate with the programmer (the CPU cannot communicate with the programmer during power-up diagnostics). If the OK LED is OFF, the system has failed and the CPU cannot communicate with the programmer.

Memory
Protect
Keyswitch
LEDs
CPU Mode	B
CPU Mode	A
Switch	T
Switch	T
	E
	R
Battery	Y
Battery
Connectors
Port 1
RS-232
Port 2
RS-485
Port 3
RS-422/485

RUN: This LED is ON when the CPU is in the RUN/ENABLE or RUN/DISABLE mode. It is OFF when the CPU is in STOP mode.

ENabled: This LED is ON when outputs are enabled and OFF when outputs are disabled.

MEMory PROTECT: This LED indicates the status of the memory protect keyswitch. It is ON when the keyswitch is in the ON position. It is OFF when the keyswitch is in the OFF position.

P1, P2, P3: LED blinks intermittently when there is serial communications on the indicated serial port (Port 1, Port 2, or Port 3).

Battery Connectors

There are two identical battery connectors. The battery currently installed can remain connected while a new battery is being installed, minimizing the risk of data loss. A Low Battery Warning occurs when the battery needs replacement.

When the CPU is in storage, the battery can be disconnected if there is no application program stored in memory. If a program is stored in memory, the battery should not be disconnected, or the data will be lost.

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Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide – May 2000

GFK-1527A

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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 Definition of Terms IntroductionEnhanced Hot Standby CPU Redundancy Compatibility with CPU780 Using the Redundancy CPU for Non-Redundant OperationRedundancy CPUs as Compared to Other Series 90-70 CPUs Features not Available with Redundancy CPUsDifferences in Operation for Redundancy CPUs Redundancy Communications Module Enhanced Redundancy CPU ModuleRedundant Racks Systems for Enhanced Hot Standby CPU RedundancyLocal I/O Genius I/OCable Connections Local I/0 Can be Enhanced Hot Standby CPU Redundancy System with Local I/OGHS Control Strategy Control StrategiesGDB Control Strategy Output Control with GHS Basic Enhanced Hot Standby OperationOutput Control with GDB 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 StrategyOn-Line Repair Online ProgrammingDuplex CPU Redundancy System Components For Installation InstructionsSystem Racks Redundancy CPU FeaturesCPU Architecture Watchdog TimerExpansion Memory Board Memory Protect Keyswitch CPU FeaturesBattery Connectors CPU LEDsPort CPU Mode SwitchUnit Select Pushbutton Redundancy Communications ModuleRCM Status Leds ConnectorBus Transmitter Module ConnectorsBus Transmitter Module Status LEDs Cables and Termination Bus Receiver ModuleBus Receiver Module Status LEDs 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 Input Scan Backup Qualification with Svcreq #43Validating the Backup PLCs Logic Solution Switching Times Switching Control to the Backup UnitRUN 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 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 Module and Cables Central Processor UnitRedundancy Communications Link Failures 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