Series 90-70 GENIUS Bus Controller and GENIUS I/O
Contents
1. REPLACE GBC RESTORE POWER GBC70T 15 SYSTEM OPERATING OK NO REFER TO FOLLOWING PAGE ADDITIONAL TROUBLESHOOTING PROBLEM TIPS SOLVED IF PROBLEMS PERSIST CALL YOUR LOCAL DISTRIBUTOR OR THE GE FANUC PLC HOTLINE FOR ASSISTANCE PAGE 18 GBC70U Additional Troubleshooting Tips Ifthe PLC is in RUN ENABLED mode verify all blocks are powered on Verify all blocks are communicating with the PLC CPU both LEDs on If a block is not communicating the I O Fault Table will show a Loss of Block fault for that block Verify bus is connected to all devices and to GBC Fault Table will have a Loss of Block fault for all blocks downstream from a bus break Verify with the Hand Held Monitor that all blocks can be monitored from the bus connector on the 90 70 Genius Bus Controller Verify configuration of block in LM90 Configuration is the same as the block s configuration with the Hand Held Monitor 1 Grouped vs Input only etc The PLC Fault Table will show System Configuration Mismatch I O type mismatch model number mismatch BCD length mismatch reference address mismatch Verify baud rate of GBC matches configured baud rate of the blocks If you change the GBC baud rate and store configuration to the PLC the GBC must be power cycled for the baud rate to be effective The I O Fault Table may have Loss of Block fault if baud rates dif2. RECONNECT POWER BLOCH INTENDED CONFIGURE BLOCK WITH HH REWIRE BLOCK TO BUS NO RELEASE FORCED CIRCUIT WITH HHM GBC70H PAGE 8 12 FROM PG 8 IS ENABLED LED NO BLINKING ERRATICALLY SEE NOTE 4 YES IS CPU RUNNING WITH OUTPUTS YES NO YES REFER TO REMOVE HHM SERIES 90 70 FROM THE BUS TROUBLESHOOTING GUIDE PAGE 9 GBC70J 13 FROM PG 9 VERIFY HHM SBA IS UNUSED BY PROBLEM OTHER DEVICES CORRECTED ON THE BUS 9 i USING HHM CHECK SBA 5 OF EACH DEVICE ON POSSIBLE DEFECTIVE BLOCK PROBLEM RRECCED THE BUS TO ENSURE CORREC EACH SBA IS UNIQUE REMOVE POWER FROM BLOCK SEE NOTE 5 UNWIRE BLOCK FROM BUS REPLACE BLOCK RECONNECT POWER TO BLOCK CONFIGURE BLOCK WITH HHM REWIRE BLOCK TO BUS START PAGE 1 PAGE 10 GBC70K GBC TROUBLESHOOTING S GBC OK LED CONTINUOUSLY ON IS GBC MODULE OK LED BLINKING NO IS GBC OK LED OFF 20 PAGE 16 a PAGE 11 DO LEDS BLINK YES NO DEFECTIVE GBC REMOVE POWER REPLACE GBC RESTORE POWER GBC70L VERIFY RACK POWER CPU RESET GBC LOSS OF IOC CYCLE POWER ON RACK 22 FAULT IN I O USING LM90 READ FAULT PAGE 18 FAULT TABLE EXPLANATION AND RESOLVE PROBLEM DEFECTIVE GBC REMOVE POWER 17 REPLACE GBC PAGE 14 RESTORE PO
3. BLOCK HAS PROPER REFERENCE ADDRESS 15 CIRCUIT HAS OUTPUTS ENABLED YES FAULT YES VERIFY CPU IS RUN ENABLED INTENTIONAL VERIFY BUS IS INTACT AND TERMINATED PROPERLY IGNORE VERIFY BAUD RATE OF GBC AND FAULT ALL BLOCKS ARE THE SAME BLINKING UNIT OK LED INDICATES CIRCUIT FAULT PAGE 2 GBC70B NO ENSURE BLOCK POWER IS WITHIN RANGE IS PROBLEM CORRECTED CHECK SBA OF EACH DEVICE ON BUS TO ENSURE NON DUPLICATION OF SBAs SEE NOTE 5 14 PAGE 10 GBC70C 5 2 4 LEDS OFF CLEAR ANY FAULTS IN PLC FAULT TABLE POWER CYCLE RACK CONTAINING GBC IS GBC CH1 LED YES ON NO OUTPUTS ENABLED YES BLOCK amp GBC NOT COMMUNICATING VERIFY BLOCK IS INCLUDED IN LM90 CONFIGURATION ENSURE GOOD CABLING AND PROPER TERMINATION OF BUS SEE NOTE 3 NO REFER TO SERIES 90 70 TROUBLESHOOTING GUIDE GBC70D 6 FROM PG 2 7 FROM PG 4 CYCLE POWER TO BLOCK CIRCUIT FAULT PRESENT DETERMINE FAULT USING HHM OR I O FAULT TABLE IN LOGICMASTER 90 70 FAULT IS REPORTING IN BLOCK MUST PROBLEM BE ENABLED FOR FAULT TO CORRECTED APPEAR IN I O FAULT TABLE CLEAR FAULT USING HHM OR LM90 POSSIBLE DEFECTIVE BLOCK REMOVE POWER FROM BLOCK UNWIRE BLOCK FROM BUS REPLACE BLOCK RECONNECT POWER TO BLOCK CONFIG
4. Bus improperly wired or intermit Block functioning Circuit tent bus forced OFF ON Defective GBC Blink Circuit fault CPU communicat Ei OFF No power to GBC or GBC reset mm e It No CPU DICE M O COME OFF Blinking Defective GBC ing nications for 3 bus scans Alternate blinking Circuit fault Circuit forced Blinking ON Defective GBC Synchronous blinking No CPU communications serial Blinking OFF GBC failed power up blank slot bus address conflict between GBC and PLC CPU or No power to block or block I O chain between expansion rack faulty For RTD Thermocou and main rack is broken ple and Current source analog Blinking Blinking blocks I O enabled LED is off For RTD Thermocouple and Current source analog blocks this indicates an Electronics as sembly Terminal assembly mis match Genius Cable Troubleshooting One of the reasons for the popularity of the Genius I O family is the advanced level of diagnostics available on a point by point basis These diagnostics allow for quick identification of block level hard ware and I O wiring problems thus minimizing the overall mean time to repair MTTR for the control system These diagnostics do not however assist in the troubleshooting of communications prob lems related to the cable plant especially in newly installed systems Here is a list of the troubleshooting tips that have proven to be the most valuable in starting up countless Genius systems around t
5. 18 ARE BOTH GBC LEDS ON VERIFY BUS CONNECTOR HAS JUMPERS ACROSS NO SERIAL 1 amp SERIAL 2 NO VERIFY HHM HAS IS GBC ON END OF BUS UNIQUE SBA VERIFY NO DEVICE ON BUS HAS SAME SBA AS GBC DEFECTIVE GBC REMOVE POWER VERIFY BUS IS REPLACE GBC TERMINATED RESTORE POWER WITH CORRECT RESISTORS SEE NOTE 3 PAGE 15 GBC70R GBC PASSED POWER UP DIAGNOSTICS 20 FROM PG 11 IS LM90 CONFIG STORE CONFIG TO EQUAL TO PLC CONFIG IN PLC 22 PAGE 18 GBC CH1 LED STATE VERIFY BUS IS INTACT AND PROPERLY TERMINATED VERIFY BUS CONNECTOR IS FIRMLY INSTALLED ON GBC VERIFY ALL BUS DEVICES CONFIG RESOLVE MISMATCH ARE COMPATIBLE 90 70 MISMATCH FAULTS FOR SLOT GBC DOES NOT SUPPORT FAULTS IN PLC WHERE GBC RESIDES PHASE A DEVICES 2 RESTORE CONFIG IF NECESSARY 5 OK LED CONTINUOUSLY POWER CYCLE ON RACK CONTAINING GBC PAGE 16 GBC70S 21 POWER CYCLE RACK CONTAINING FROM PG 16 GBC EXCESSIVE BUS ERRORS CAUSED GBC TO DROP OFF THE BUS POWER OFF OR REMOVE ALL DEVICES ON THE BUS RESTORE THEM UNTIL THE DEVICE CAUSING THE EXCESSIVE BUS ERRORS IS FOUND REPLACE DEVICE PAGE 17 ARE BOTH YES 22 GBC LEDS PAGE 18 ON i NO DOES I O FAULT TABLE HAVE ERROR RATE FAULT YES NO DEFECTIVE GBC REMOVE POWER
6. ECTANGLE TELLS YOU TO DO SOMETHING 5 PAGE 6 A NUMBERED BUBBLE WITH AN ARROW INTO THE BUBBLE INDICATES THAT THE PROCEDURE IS CONTINUED AT A CORRESPONDINGLY NUMBERED BUBBLE ON THE INDICATED PAGE NUMBER A NUMBERED BUBBLE WITH AN ARROW OUT OF THE BUBBLE INDICATES THE START OF A PROCEDURE ON THAT 1 USING Refer to Preface for GENIUS BLOCK information on safety START considerations related TROUBLESHOOTING publications and the symbols used in this guide IS UNIT S UNIT OK LED ARE UNIT OK amp OK LED NO BLINKING YES ENABLED LEDS NO RYTHMICALLY BLINKING ON SYNCHRONOUSLY YES SEE NOTE 4 ES 8 PAGE 6 ERRATIC OR OFF UNIT OK eo x LED INDICATES COMMUNICATIONS OR INSUFFICIENT POWER OR ARCONT IOT BLOCK FAILURE ENSURE BLOCK POWER VERIFY HHM SBA IS ono aa UNUSED BY ANY OTHER PROPERLYCONNECTED DEVICE ON THE BUS SEE NOTE 1 USE HHM TO ASSIGN BLOCK AN UNUSED SBA 2 19 CHANGE BLOCK SBA IN LM90 AND Hee CURRENT STORE CONFIG TO PLC SOURCE ANALOG OR THERMOCOUPLE BLOCK SEE NOTE 2 14 PAGE 1 PAGE 10 GBC70A GFZ 0087 4 FROM PG 9 ARE UNIT OK amp ENABLED LEDS BLINKING ALTERNATELY NO INDICATES FORCED CIRCUIT CIRCUIT FAULT OFF ENABLED LED INDICATES NO BUS COMMUNICATION PAGE 8 DISABLED OUTPUTS zm CYCLE POWER ON GBC VERIFY BLOCK IN LM90 CONFIG HAS SAME SBA AS
7. FANUC GE Fanuc Automation PQ Box 8106 Charlottesville VA 22906 GFZ 0087 FANUC GE Fanuc Automation Programmable Control Products Series 901 70 GENUS V Bus Controller and GENIUS I O System Troubleshooting Guide FANUC GE Fanuc Automation Programmable Control Products Series 90 _7o GENUS Bus Controller and GENIUS I O System Troubleshooting Guide GFZ 0087 January 1994 Notice This document is based on information available at the time of its publication While efforts have been made to be accurate the in formation contained in this document does not purport to cover all details or variations in hardware and software nor to provide for every contingency in connection with installation operation and maintenance This document may describe features not present in all hardware and software systems GE Fanuc Automation as sumes no obligation of notice to holders of this document with re spect to changes subsequently made GE Fanuc Automation makes no representation or warranty ex pressed implied or statutory with respect to and assumes no re sponsibility for the accuracy completeness or usefulness of the in formation contained in this document No warranties of merchantability of fitness for purpose shall apply The following are trademarks of GE Fanuc Automation North America Inc Alarm Master CIMSTAR Helpmate PROMACRO Series Six CIMPLICITY GEnet Logicmaster Series One Series 90 CIM
8. Manual 0265 Series 90TM 70 PLC Genius Bus Controller User s Manual GFK 0398 Genius I O System and Communications User s Manual GEK 90486 1 Genius I O Discrete and Analog Blocks User s Manual 90486 2 Genius I O PCIM User s Manual GFK 0074 Genius PowerTRAC Block User s Manual GF K 0450 Genius High Speed Counter User s Manual GFK 0415D Series 30 Genius Communications Module User s Manual GFK 0412 Series 30 Enhanced Genius Communications Module User s Manual 0695 We Welcome Your Comments and Suggestions At GE Fanuc Automation we strive to produce quality technical documentation After you have used this troubleshooting guide please take a few moments to write us with your comments and suggestions Our address is Manager Technical Publications GE Fanuc Automation PO Box 8106 Charlottesville VA 22906 Drake C Fink Sr Staff Systems Engineer Using this Guide This guide directs you to use the Genius Hand Held Monitor and the Series 90 70 Fault Tables to troubleshoot your Se ries 90 70 Genius Bus Controller and the attached Genius bus sys tem If you are unfamiliar with the operation of the HHM refer to GFK 0121 Genius Hand Held Monitor Data Sheet and 09486 2 Genius I O Discrete and Analog Blocks User s Manual For information on using the HHM with the PowerTRAC and High Speed Counter Blocks refer to the manual
9. PLICITY 90 ADS Genius Modelmaster Series Three VuMaster ProLoop CIMPLICITY PowerTRAC Series Five Workmaster Genius Power TRAC Copyright 1993 GE Fanuc Automation North America Inc All Rights Reserved Safety Considerations General Warnings When Troubleshoot ing Stand clear of controlled equipment when power is applied If the problem is intermittent sudden unexpected machine motion could occur causing injury Also reference NFPA 70E Part II for addi tional guidelines for safety practices Never reach into a machine to operate a switch since unexpected motion could occur causing injury Remove all electrical power at the Main Power Disconnect to en sure total power removal Always remove power before inserting or removing modules or before connecting I O cabling Preface This guide describes a logical sequence for troubleshooting your Series 90 70 Genius Bus Controller communications between the 90 70 GBC and attached Genius blocks and the installed Genius cable plant The Series 90 70 PLC is a member of the Series 90 family of programmable logic controllers from GE Fanuc Automa tion Revisions to this Troubleshooting Guide This is the first release of this Troubleshooting Guide Related Publications Series 90 _70 Programmable Controller Installation Manu al 0262 Logicmaster 90 70 Programming Software User s Manual 0263 Series 90 _70 Programmable Controller Reference
10. URE BLOCK WITH HHM REWIRE BLOCK TO BUS IS PROBLEM CORRECTED PAGE 5 GBC70E 8 FROM PG 1 IS I O 10 ENABLED LED WO PAGE 8 SEE NOTE 4 YES ARE BOTH GBC LEDS CONTINUOUSLY ON YES NO PAGE 6 PROBLEM SOLVED GENERAL TROUBLESHOOTING VERIFY CORRECT SBA OF PROBLEM BLOCK S VERIFY BLOCK IS CONFIGURED PROPERLY IN LM90 CHECK OPERATION OF ELECTROMECHANICAL FIELD DEVICE VERIFY VOLTAGE IS WITHIN RANGE VERIFY BLOCK IS APPROPRIATELY GROUNDED VERIFY BLOCK IS CONNECTED TO AN ACTIVE BUS IF BSM IS IN USE VERIFY BUS DEVICES AND GBC AT SAME BAUD RATE VERIFY NO PHASE A DEVICES ARE ON THE BUS IF IN HOT STANDBY MODE ENSURE THAT THE MASTER BUS CONTROLLER IS AT SBA 31 AND THE BACKUP GBC70F 9 FROM PG 6 DO ANY ARE THE I O INPUTS OR FORCED OUTPUTS OPERATE ON THE BLOCK CHECK FOR OVERRIDES WITH AND LM90 IF INTENTIONAL 8 CHECK FOR SEE NOTE 7 OVERRIDES WITH AND LM90 IF UNINTENTIONAL REMOVE SEE NOTE 7 CHECK FOR FORCES WITH LM90 AS WELL AS WITH THE HHM 14 PAGE 10 7 GBC70G 10 FROM PG 6 IS PROBLEM YES IS ENABLED LED NO BLINKING RYTHMICALLY YES POSSIBLE DEFECTIVE BLOC REMOVE POWER FROM BLOCK UNWIRE BLOCK FROM BUS REPLACE BLOCK ARE FORCEDN YES CIRCUITS
11. WER CONTACT YOUR DISTRIBUTOR OR THE GE FANUC HOTLINE IF LOSS PERSISTS PAGE 12 GBC70M 16 FROM 11 GBC FAILED ON POWER UP VERIFY I O CHAIN IS REMOVE POWER ELIMINATE BLANK a AME BTM BLANK SLOT SLOT GBC IN MAIN BETWEEN GBC RESTORE POWER VERIFY BRM IN AND BRM IN EXPANSION RACK EXPANSION HAS OK LED ON RACK RACK MODIFY LM90 CONFIGURATION AND STORE TO PLC BLANK SLOT BETWEEN CPU amp GBC BLANK SLOT BETWEEN CPU AND BTM IN MAIN RACK CYCLE POWER ON MAIN RACK REMOVE POWER ELIMINATE BLANK SLOT RESTORE POWER MODIFY LM90 18 CONFIGURATION AND PAGE 14 STORE TO PLC 18 14 13 GBC70N CYCLE POWER ON RACK CONTAINING GBC PAGE 14 18 FROM PG 13 22 ARE BOTH YES GBC LEDS PAGE 18 ON NO USING LM90 READ FAULT EXPLANATION AND RESOLVE PROBLEM ARE BOTH CLEAR FAULT TABLES GBC LEDS TABLES CYCLE POWER ON ALL ON RACKS YES DEFECTIVE GBC REMOVE POWER REPLACE GBC RESTORE POWER 22 18 a GBC70P VERIFY THAT 19 SERIAL BUS ADDRESS SERIAL 1 11 CONFLICT SERIAL 2 SHIELD IN SHIELD OUT LINES ARE CONSISTENT THROUGHOUT GENIUS NETWORK VERIFY GENIUS NETWORK TERMINATIONS SEE NOTE 3 REMOVE BUS CONNECTOR FROM GBC YES 22 PAGE
12. at least one if not both of the exposed shield wires with spaghetti tubing so that the critical Shield In and Shield Out isolation is maintained Check for any splices in the cable plant Cable splices are NOT rec ommended because they can cause signal reflections and introduce noise into the system but if they are absolutely necessary then they should be made inside a grounded junction box using a high quality barrier type terminal strip with screw connections Mixing of differ ent cable types or manufacturers is NOT recommended even for cables with similar specifications Check for violations of the minimum bend radius for your cable type Ifthe minimum bend radius specified is exceeded then the signal car rying conductors may not be correctly centered within the shield lay er This can cause signal impedance problems for communication systems like Genius that operate at higher frequencies Sharp right angle bends should be avoided atall costs The larger the bend radius the better in terms of preventing communications problems Make sure that the overall cable length and baud rate are compatible with the cable type used Check the table on page 2 2 of GFK 90486D 1 to see if the total cable length in your cable plant is less than maximum specified for your chosen baud rate It may be necessary to change cable types baud rates or cable length and rout ing in order to get your cable plant within acceptable guidelines Be aware th
13. at reducing the baud rate can also limit the total number of devices permitted on the bus Genius Cable Troubleshooting Serial Bus Address Conflicts There can be one and only one device block controller or Hand Held Monitor on each bus assigned to each Serial Bus Address 0 to 31 If more than one device on the bus has the same Serial Bus Address then the BLOCK OK and I O EN ABLED LEDs on the affected block s will blink synchronously Block Grounding Each Genius block must have a secure and direct connection to ground This ground must be made using one of the green ground screws on the side of the Terminal Strip Note that it is NOT acceptable to daisy chain the ground connection between mul tiple blocks since ground loops and noise can result Load Suppression Inductive loads such as solenoids and relays re quire suppression circuitry to prevent the RFI noise produced by the coils from affecting the Genius block driving that load This suppres sion normally takes the form of flyback diodes for DC coils and RC snubbers for AC coils The suppression devices should be installed at the coil or as close as possible and not at the Genius block output point in order to prevent the noise from being coupled into other un protected wiring circuits that may be routed in parallel Refer to Chapter 2 of GFK 90486C 2 for specific information on load sup pression devices Genius Bus Device Baud Rates devices on each Genius bus mu
14. cted or disabled with jumpers You need to make sure that these jumpers are set correctly for your instal lation it is easy to forget about these and accidentally have a third termination resistor or the wrong value resistor in your network One common problem reported during installation is communication errors between the Hand Held Monitor and stand alone blocks dur ing the initial block configuration process This occurs because there is no termination to the communications bus connecting the Hand Held Monitor and the block believe it or not the coiled HHM cable is long enough to require termination Add a 75 Ohm resistor across the Serial 1 and Serial 2 terminals of the target block and the errors should disappear Be sure and remove this resistor once you are done configuring the blocks to prevent over termination of your cable plant Genius Cable Troubleshooting Divide and Conquer troubleshooting tips detailed above presume that all Genius devices connected to the bus are functioning properly and that there is no defective or damaged cable anywhere in the system While most Genius bus problems are resolved by one of the techniques listed above there are times when further steps must be taken to find the cause of the communication difficulties The sim plest way to find defective blocks or cable is to use the divide and conquer method To do this power down the system disconnect the bus at some convenien
15. fer If the situation persists call your distributor or GE Fanuc Hotline for assistance Notes and Precautions Supply input voltage power tolerances for Genius blocks va ries with the type of block Analog Digital and type of voltage AC DC Refer to the data sheet for an individual block for sup ply voltage tolerances For Resistive Temperature Detector RTD Thermocouple TC and Current Source Analog CSA blocks only Unit OK LED off and I O Enabled LED blinking indicates an electrical assem bly terminal assembly mismatch For these same blocks Unit OK off and I O Enabled LED off or blinking indicates the block is faulty or there is no power to the block The Genius bus must be terminated with a resistor at each end No resistor is permitted at any device which is in the middle of the bus including Genius Bus Controllers The resistor must match the impedance of the cable Refer to the cable manufac turer s data sheet for cable impedance Bus connections must be secure at each device Shield In and Shield Out connections must be properly paired from Shield Out on one device to Shield In on the next device on the bus The cable must have no breaks Refer to the Field Service note Genius Cable Plant Trouble shooting Tips for additional information Unit OK and I O Enabled LEDs on a block may blink synchro nously when the block is being configured by the Hand Held Monitor In this case the synchronous blin
16. he world If you have found others we d like to know about them Cable Installation There are a number of cable installation details that should be checked twice if you are having trouble establishing reliable communications on your Genius cable plant Make sure that the Serial 1 and Serial 2 lines are connected to the cor rect terminals on each Genius block and or controller If even one block has these wires crossed there can be sporadic problems with loss of communications to one or more blocks Make sure that the Serial 1 and Serial 2 lines not shorted to each other to the shield lines or to ground at any point in the system Make sure that the Shield In and Shield Out lines are properly con nected thoughout the system It is very important that the Shield Out terminal of the first bus device is connected to the Shield In terminal of the second device and that the Shield Out terminal of the second device is connected to the Shield In terminal of the third device and so forth in a daisy chain throughout the system The first device s Shield In and the last device s Shield Out terminals should be left un connected Incorrect wiring of the Shield In and Shield Out terminals can lead to ground loops and noise interference in your communica tions Make sure that the Shield In and Shield Out lines are not short ing to each other where they are exposed at each connection point in the network Itis a good idea to insulate
17. king is not a fault and may be ignored When the serial bus address SBA also called device number is being checked and you have reason to suspect that the SBA is duplicated in another device on the bus the device being checked must be powered up and disconnected from the rest of the bus while the check is made When a circuit fault occurs on a block the I O enabled LED blinks You must correct the circuit fault first then clear the fault The block latches the circuit fault indication when it oc curs CAUTION The overrides may be there for a reason Check before removing them H The following table shows the various states of the Module OK and Tro u bles hooti ng M atrix Channel 1 OK LEDs on a Series 90 70 Genius Bus Controller The following table shows the various states of the Unit OK and I O and the meaning of those states A bus controller s two LEDs indi Enabled LEDs on a Genius block and the meaning of those states cate its current operating condition After startup both of these LEDs This matrix and other block troubleshooting information is in Chap are normally on ter 17 I O Block Troubleshooting of GEK 90486 2 Genius I O Dis crete amp Analog Blocks User s Manual Volume 2 MODULE CHANNEL 1 MEANING UNIT MEANING OF OK loaded ON unctioning CPU com municating ON OFF GBC powered on no config Block functioning No CPU loaded or slot misconfigured communications for 3 bus scans ON Blinking
18. s for those de vices 0405 Genius PowerTRAC Block and GFK 0415 Ge nius I O High Speed Counter If you are unfamiliar with accessing and interpreting the Series 90 70 I O Fault Table refer to GFK 0263 Logicmaster 90 70 Programming Software User s Manual and GFK 0265 Series 90 70 Programmable Controller Reference Manual Sometimes solving one problem reveals another problem There fore when this guide concludes that a problem seemingly is re solved you are directed to reverify the condition of the system When you resolve a problem with a Genius device also verify that the Genius Bus Controller functions properly Similarly when you resolve a problem with the Genius Bus Controller also verify that all Genius devices are functioning as you expect This Guide does not apply to troubleshooting Genius Modular Redundancy sys tems Abbreviations used in this Guide include BTM Bus Transmitter Module IC697BEM713 BRM Bus Receiver Module IC697BEM711 GBC Genius Bus Controller IC697BEM731 HHM Genius Hand Held Monitor LM90 Logicmaster 90 70 SBA Serial Bus Address same as device number The next page describes the symbols used in this Troubleshooting Guide SYMBOLS USED IN THIS GUIDE BEGIN AT THIS SYMBOL START ON THE FIRST CHART FOLLOW THE PATH WITH THE CORRECT ANSWER IN THE DIRECTION OF THE ARROW SYMBOLS USED THROUGHOUT THE GUIDE ARE GEOMETRICALLY CODED A DIAMOND ASKS A QUESTION A R
19. st have the same baud rate selected 38 4k 76 8k 153 6k STD or 153 6k EXT Even one block or controller set for the wrong baud rate will lead to unpredictable communications Every block con troller and Hand Held Monitor connected to the Genius bus must be checked to verify that it is set for the desired baud rate Termination Resistors Termination resistors are critical for the cor rect operation of your Genius cable plant These resistors are needed to absorb and eliminate any echoed or reflected signals can be gener ated in a communications system operating at high frequencies like those used by Genius Check to see that the correct termination resis tors have been installed in the correct locations There should be two and only two termination resistors installed in the network with one located at each of the physical ends of the cable plant It is not necessary to install a termination resistor at the bus controller if it is located in the middle of the cable plant The termination resistor value for your cable installation will be de pendent on the cable type used See the table on page 2 2 in GFK 90486D 1 for the exact resistor value Note that these resistors should NOT be of the wirewound variety since this will introduce un wanted inductance into the system Be advised that the Series Six Genius Bus Controller and the Genius Personal Computer Interface Module PCIM each have built in ter mination resistors that can be sele
20. t point ideally at the halfway point and terminate the section with the bus controller Turn the system power back on and observe the communications performance If the prob lem persists on the shortened bus split it and re terminate again Re peat this process until the shortened bus is finally operating correctly Start adding back one block at a time until the problem appears again The block and or the cable section that is added when the problem appears should be investigated carefully The problem block is ei ther defective mis wired has a conflicting bus address or has an in correct baud rate It is also possible that there is a problem with the specific sections of cable connected to the block there may be bro ken or shorted conductors insulation problems bad splices mini mum bend radius violations or excessive noise sources along the cable path
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