Input Line Fault Detection in a GMR Application | GE GFK-0787B

5

Input Line Fault Detection in a GMR Application

The 16-circuit Genius blocks are capable of continually monitoring field circuits for input short circuit or open circuit faults. The blocks detect On, Off, Short Circuit, or Open Wire conditions on circuits set up as tristate inputs.

If a block is in a ªnon-GMRº mode, a resistor must be installed in the circuit to provide Open Wire fault detection. However, if the block is in GMR mode, a zener diode is used instead to detect short circuits. The diode is installed in series between the field switch and the tristate input blocks, but physically at the field switch device. The Zener diode rating is 6.2V.

Block Setup for Tristate Inputs

V+

Field

Switch

Zener

Diode

When a block is in GMR mode, the status and on/off state of a tristate input have different specifications than they do in non-GMR mode.

DC Source	Range	Non-GMR			GMR
Block
Block		Status		Input	Status	Input
Tristate		Status		Input	Status	Input
Tristate
Input	<30% VDC	open circuit fault		0	off	0
Thresholds	>50%, < VDC+	Off		0	On	1
	±7V

	>VDC+ ±4V	On		1	shortcircuitfault	1

DC Sink		Range	Non-GMR			GMR
Block
Block			Status		Input	Status	Input
Tristate			Status		Input	Status	Input

	<4V		On		1	shortcircuitfault	1
Input	<4V		On		1	shortcircuitfault	1
Thresholds	>7V,	<50% VDC+	Off		0	On	1
	>70%	VDC+	open circuit fault		0	Off	0

When used with a GMR block, a Genius Hand-held Monitor will correctly report a short circuit fault instead of Open Circuit.

5-14	GeniustModular Redundancy Flexible Triple Modular Redundant (TMR) System	GFK-0787B
	User's Manual ±March 1995

Image 74

GE GFK-0787B user manual Input Line Fault Detection in a GMR Application

Contents

GE Fanuc Automation GFL±002 Preface Preface Related Publications Contents Chapter Configuration Appendix a TÜV Certification Appendix B Maintenance Override Chapter Introduction Components of a GMR System Series 90-70 PLCs Inter-processor Communications Busses and Bus Controllers Additional Bus Controllers for Communications Operation Overview Input Subsystem PLC Subsystem Voting on Input Data Automatic System Test PLC Subsystem Providing Output DataOutput Subsystem Analog, RTD, and Thermocouple Blocks Genius I/O BlocksDiscrete Blocks Block Summary Number of Non-GMR I/O Available for the 789 CPU Number of I/O Points in a GMR SystemNumber of Non-GMR I/O Available for the 788 CPU 798 Configuration and Programming GMR Basic Steps of Configuration and Programming Chapter Input Subsystem Overview GMR Input Groups One sensor to one Genius input Inputs from non-GMR I/O blocks Non-Voted I/O in the Input SubsystemInputs from single-block simplex GMR input groups Discrete Input Processing Discrete InputsTypes of Blocks in the Input Subsystem Discrepancy Reporting for GMR Inputs Input Autotest for GMR Inputs Calculating Voltage Drops on Tristate Inputs Normally-open Inputs Line Monitoring for Discrete InputsNormally-closed Inputs Input Filter Time Manual Input Controls Number of Input Sensors per Voted Channel Analog InputsVoted Analog Inputs Analog Voting Adaptation Non-GMR Analog Blocks Analog Discrepancy ReportingNon-Voted Analog Inputs in GMR Input Groups Chapter Output Subsystem Types of Blocks in the Output Subsystem Output Voting Duplex Default for OutputsGMR Output Handling Results of Block Group Voting with Three PLCs Online Output Fault Reporting PLC Logon Control Block Output Groups Output Load Sharing Bus Redundancy in a 4-Block Output Group Electrical Characteristics of Sink and Source BlocksOperation of a 4-Block Output Group Manual Output Controls and Diagnostics GMR Mode Redundancy Modes for Output Blocks Hot Standby Mode in a GMR System Hot Standby ModeBasic Hot Standby Mode Operation Chapter PLC Subsystem System Startup All GMR bus controllers at serial bus address Online Changes Data Initialization CPU Sweep in a GMR System PLC Operation Important Note Estimating CPU Sweep TimeSweep Time Contribution of Genius I/O and GBCs Discrete Inputs Input ProcessingDiscrepancies Discrete Input Voting Voting with Three Discrete Inputs Voting with Two Discrete Inputs Voting for One Discrete Input Analog Inputs Analog Input Voting Voting for Three Analog Inputs Voting for Two Analog Inputs Voting for One Analog Input Output Processing Discrete Outputs Shutdown Synchronous or Asynchronous Input Autotest and I/O Shutdown M12265 ± Sdcan Cancel I/O Shutdown Output Faults that Cause I/O ShutdownM12244 ± Iosd Any I/O Shutdown Timer Activated Programming for I/O Shutdown Hours Shut Down Recovery Shut Down Prevention Global Data Redundancy Entering, Clearing, or Setting Global DataCommunications Between PLCs Chapter Diagnostics Programming for Diagnostics Output Diagnostics Diagnostics in a GMR SystemInput Diagnostics CPU Redundancy Mode Configuration Block Type Setting Up Blocks to Report Genius FaultsSetting Up Other Blocks to Send Multiple Fault Reports Summary Table GMR Autotesting Autotest Sequence Discrete Input Autotest Configuration Required for Discrete Input AutotestSetup for Input Autotest Operation of the Input Autotest Circuit Fail Mask Discrete Output Autotest Operation of the Discrete Output Autotest Block a Pulse-tested Pulse Test Operation Input Data GMR Discrepancy ReportingDiscrete Input Discrepancy Reporting Voted Discrepancy Inputs Discrete Output Discrepancy Reporting with Dynamic Outputs Discrete Output Discrepancy ReportingHow Output Discrepancy Checking is Performed Analog Input Discrepancy Reporting Input Line Fault Detection in a GMR Application PLC and I/O Fault Tables in a GMR System Clearing the Fault Tables in a GMR System Fault Table Messages for GMR Reporting of No-Load Faults on 4-Block Output Groups Fault Type for Output Autotest Fault Description Code Hex MeaningFault Specific Data Message PLC Fault Table Messages for GMRCode Code Code 10903 Code Manual Output Controls and Diagnostics Monitoring Manual Output Controls Fault, No Fault, and Alarm Contacts Discrete Input Fault Contacts for GMR Discrete Output Fault Contacts for GMR Contact References Associated with an Output ShortCircuitfault Overtemperaturefault Overloadfault Fault Contacts for Analog Inputs Analog Fault and Alarm Contacts for GMRAlarm Contacts Fault Contacts for Analog Outputs Chapter Configuration Configuration Overview Basic Steps of Configuration For Information to be copied set only Configuration to yes Using the GMR Configuration Software GMR Configuration Software Revision and Checksum Installing the Configuration Software Getting Started Mouse and Keyboard Guide for the Configuration Software Using a Mouse Configuration GMR Configuration Summary Insert the first GBC bus controller group Opening a Previously-Saved Configuration File Creating/Selecting a File Saving a Configuration File Closing a Configuration File without Saving It Changing to Another Directory Entering a System Description Starting a New ConfigurationClosing and Deleting the System Configuration File GMR Configuration Selections When you select System, the following menu appears Shutdown CPU ConfigurationSimplex Test Interval Period Input Discrepancy Filter Limits Global Data Initialization Data+ %R data needed for the application Spare Initialize Data GBC1 GBC2 Parame Comment Ters M12234 Fault ActionsM12232 Write Access Adding Bus Controllers and I/O Modules Genius Bus Controller Group Configuration Exiting the Window Exiting a Block Group Window Configuring the Input Subsystem for a Bus Controller GroupSelect To Configure Start %I SBA Auto Test GFK-0787B Duplex State GFK-0787B Analog I/O Group Configuration Vote Adapt Mode Vote Adaptation Default State Analog Discrepancy Thresholds and Limits Configuring the Output Subsystem for a Bus Controller Group Start %Q GFK-0787B Options Start Ref Bus C inputs Reserved inputs Configuration References are 0001 to CONFIG4 Creating the GMR10 Output File Printing the GMR Configuration Completing the Logicmaster 90 Configuration Configuring Bus Controllers Creating and Copying the PLC Configuration Logicmaster Configuration Summary GFK-0787B Configuring GMR Bus Controllers and I/O Blocks Setting Up Blocks for Fault Reporting Configuring Genius I/O BlocksCopying Configurations Editing the Reference Addresses Device Configuring 16-Circuit and 32-Circuit Discrete DC BlocksFeature Circuit or Factory Selections Block Setting Serial bus Circuit I/O Type Report Faults Block I/O Type Baud Rate Pulse Test Input Filter Time Configuration Duplex Default Duplex Output Default State Setting Block Duplex Voted Output Default State Setting Block Results of Block Voting with Only Two PLCs Online Chapter Programming Overview Estimating Bus Scan Time Program Instruction Set for GMREstimating Memory Usage Use of Do I/O and Suspend I/O References Reserved For Memor y Write AccessReserved References Input and Output Addressing for GMR Discrete I/O Addressing 1024 ± 16 ± 3 x 32 +1 = 913 = %I0913 Q1009 to %Q1024I1009 to %I1024 Analog I/O Addressing 16 x 6 = 96 words required AnalogOutput AddressingExample Register %R Memory Assignment for GMR Memory Required for Startup Initialization Data Monitoring Forces and Overrides Monitoring the Fault TablesSystem Status %S References GMR Status and Control %M References Status References Resetting Status Flags PLC OK Flags Reference Nickname Description Meaning Control ReferencesM12257 Continue M12262 Report Clearing the PLC Fault Tables40-characterConfiguration File Description Programming for Startup Monitoring Startup Status Enabling Outputs At Startup Powerup Note Performing I/O Fault Reset These Program Blocks represent logic Fault. If both are not 1, initialization continuesExample Ladder Logic Routines that are appropriate for Application When a third PLC comes on line Triplex bit is optional the need for this bit depends on Programming for I/O Shutdown Point FaultsEnabling I/O Point Faults Clearing Faults Associated with Fault/No Fault Contacts Programming for Fault and Alarm ContactsFault and No Fault Contacts Fault-Locating References Discrete Input Fault Contacts for GMR Discrete Output Fault Contacts for GMR Analog Fault Contacts for GMR Analog Alarm Contacts for GMR Y3 dummy not used Reading GMR DiagnosticsParameters for the Call Function Range for Start Value Data Table NumbersContains Range for End Value Error Codes for GMR Diagnostics Code Meaning Programming for Global Data Global Data for the Application Program GFK-0787B Adding GMR10 to the Logicmaster Librarian Select F6 Add Element to Library Do not Rename GMR10 Storing a Program to the PLC GFK-0787B Using the Store Function Field Description Storing an Identical Program Following CPU Replacement Storing a Revised Program Press the Space Bar to Continue Using the Program Download UtilityUsing the Download Utility with the Default PLC IDs Customizing the Download Utility for Other PLC IDs Processing Complete Programming Information GFK-0787B Chapter Installation Information Genius Bus Connections Termination Boards Input Wiring Single Sensor to Three Blocks Triple Bus Three Sensors to Three Blocks Triple Bus Block Wiring for 16-Circuit Source Block in an Input Group DC Source Block IC660BBD020 Block Wiring for 16-Circuit Sink Block in an Input Group DC Sink Block IC660BBD021 Block Wiring for 32-Circuit Source Block in an Input Group DC Source Block IC660BBD024 Block Wiring for 32-Circuit Sink Block in an Input Group DC Sink Block IC660BBD025 Output Wiring for a 16-Circuit, 4-Block Group Circuit, 4-Block Output Group Block Wiring for a 16-Circuit 4-Block Output Group Block a ON±OFF±ON Test Output Autotest and Pulse TestingOFF±ON±OFF Test GE Catalog Number CR7RBXXEL Spectra 700 IEC Control Relay Output Wiring for a 32-Circuit, 4-Block Group Block Wiring for a 32-Circuit 4-Block Output Group Block a GFK-0787B Milliamp Appendix TÜV Restrictions Catalog Number Firmware Description Revision Level Appendix a TÜV Certification COMMREQ, DATAINITCOMM, Call SUB, Callexternal Appendix Maintenance Override Project engineer Projectengineer, Typeapproval Recommendations Index Index-2 Index-3 Index-4