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

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

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 Introduction Enhanced Hot Standby CPU Redundancy Compatibility with CPU780 Using the Redundancy CPU for Non-Redundant Operation Redundancy 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 Redundancy Local I/O Genius I/OCable Connections Local I/0 Can be Enhanced Hot Standby CPU Redundancy System with Local I/O GHS 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 Setups Critical Data + Redundant Outputs Transferred Single Bus with Floating Master GDB Control Strategy Paired GBC = INT/EXT Internal External Dual Bus with Floating Master GDB Control Strategy On-Line Repair Online ProgrammingDuplex CPU Redundancy System Components For Installation InstructionsSystem Racks Redundancy CPU Features CPU Architecture Watchdog TimerExpansion Memory Board Memory Protect Keyswitch CPU FeaturesBattery Connectors CPU LEDs Port CPU Mode Switch Unit Select Pushbutton Redundancy Communications Module RCM Status Leds Connector Bus Transmitter Module ConnectorsBus Transmitter Module Status LEDs Cables and Termination Bus Receiver ModuleBus Receiver Module Status LEDs Location of GBCs and Blocks Genius Bus Controller Dual Bus Genius Networks Single Bus Genius Networks Bus Controller LEDs Programmer Connection for Configuration Configuration RequirementsOne Application Program in Both PLCs Program Folders in Control Programming Software Program Folders in Logicmaster CPU Configuration Parameters Parameter Default Range Description Configuring Shared I/O References System Communications Window Considerations Finding the Memory Available for Application Program Storage Bus Controller Configuration Parameters Rack Module Configuration Parameters Genius I/O Block Configuration Parameters Normal Operation Powerup of a Redundant CPU Resynchronization of a Redundant CPU Incompatible Configurations GDB Control Strategy GHS Control Strategy Ovrpre %S Reference Not Available References for CPU Redundancy Sweep Time Synchronization Scan Synchronization AT a Output Data Transfer to the Backup Unit Fail Wait Time Data Transfer Time GFK-1527A Normal Operation Data Transfer Example Programming a Data Transfer from Backup Unit to Active Unit Disabling 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 Unit RUN 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 Strategy CGR772 CGR935 Finding the Words to Checksum Each Sweep Finding the Total Sweep Time Finding the Background Window Time Miscellaneous Operation Information Timer and PID Function BlocksTimed Contacts Multiple I/O Scan Sets Sequential Function Chart Programming SFC Stop to RUN Mode TransitionDebugger Background Window Time Genius Bus Controller Switching Ethernet Global Data Consumption Ethernet Global Data in a Redundancy CPU Sntp Timestamping Ethernet Global Data Production Configuration of Fault Actions Fault Detection Fault Detection Message Fault Description Corrective Action PLC Fault Table Messages for Redundancy With redundancy in other fault groups Fault Response Losing a Link Faulting the Redundancy Communications Module Fault Actions in a CPU Redundancy System Fault Group Type Description Configurable Faults Fatal Faults on Both Units in the Same Sweep Non-Configurable Fault Group On-Line Repair Maintaining Parallel Bus Termination Power SupplyOn-Line Repair Recommendations Racks Redundancy Communications Module and Cables Central Processor UnitRedundancy Communications Link Failures Bus Transmitter Module Single Bus Networks Bus faultsGenius Bus Controller Genius Bus Genius Blocks Dual Bus Networks Cabling Information SpecificationsIC690CBL714A Multi-drop Cable Purpose Connector a Connector A, 15-pin Female Index Battery connectors Bus Controller, Genius Index Online programming Online repair Svcreq