SECTION 12 Troubleshooting - Support
Contents
1. B CPU Unit Indicators POWER RUN ERR ALM INH LNK ACT BKUP Not lit Probable cause Possible remedy An error has occurred in the communica tions between the Ethernet port and con nected device Confirm that the Ethernet port settings in the PLC Setup are correct Check the Ethernet cable and replace it if necessary An error has occurred in the communica tions between the serial port and connected device 598 Confirm that the serial port 1 2 settings in the PLC Setup are correct Check the cable wiring If a host computer is connected check the serial port settings and program in the host computer Troubleshooting Section 12 2 Ethernet Communication Error When Ethernet Communication Error occurs during FINS communication ser vice by built in Ethernet port the error code error contents and error s time will be stored in A40 to A44 The detail information of error code and error contents show as the following table Error code Error content Detailed information Hex 1st byte 2nd byte Node address setting error send failed Commands penile hoge nol n TDIGIWOIK send failed Ed to 14 A No unit with specified unit address send failed Bits 00 to 07 SA1 Destination address not in routing tables send failed Responses No routing table entry send failed Bit 15 ON Routing table error send failed EL 55 A s VA Command too long send failed Header error send faile2. Check the conditions for executing FAL instructions and remove any causes of the user defined error which correspond to executed FAL num bers 001 to 511 and the result will be stored in A400 as error code 4101 to 42FF E Reference Information FAL Error Flag A402 15 Error flag Error code A400 4101 to 42FF Error information None Flash Memory Errors Possible remedy A315 15 will turn ON when writing to the Replace the CPU Unit when the internal internal flash memory fails flash memory has been written to more than 100 000 times 595 Troubleshooting Section 12 2 E Reference Information Error flag Flash Memory Error Flag A315 15 Other non fatal flags A402 00 Error code A400 None Error information None Interrupt Task E rrors Probable cause Possible remedy An interrupt task error occurs when the Review the program to see whether detect Detect Interrupt task errors setting in the ing interrupt task errors can be disabled or PLC Setup is set to Detect and an attempt avoided is made to refresh a Special I O Unit from an interrupt task with IORF 097 while the Unit s I O is being refreshed by cyclic refreshing duplicate refreshing E Reference Information Error flag Interrupt Task Error Flag A402 13 Error code A400 008B Error information Interrupt Task Error A426 PLC Setup Errors Possible remedy A set value error occurre
3. below A403 00 is ON A checksum error has occurred in the user program The power supply was turned OFF when backing up the user program to flash memory Transfer the user program again A403 04 is ON A checksum error has occurred in the PLC Setup Transfer the PLC Setup again A403 07 is ON A checksum error has occurred in the routing tables Transfer the routing tables again A403 09 is ON The contents of a Memory Cassette could not be nor mally read to the CPU Unit when power was turned ON Check to see if the files required for automatic transfer at startup are present on the Memory Cassette A403 10 is ON There is a problem with flash memory A hardware error has occurred in the CPU Unit Replace the CPU Unit A403 11 is ON A checksum error has occurred in IP address table Transfer the IP address table again A403 12 is ON A checksum error has occurred in IP router table B Reference Information Error flag Transfer the IP router table again Memory Error Flag A401 15 Error code A400 80F1 Error information Memory Error Location A403 591 Troubleshooting Section 12 2 1 0 Bus Errors An I O bus error occurs in data transfer between the CPU Units and Units connected to the I O bus Cycle the power supply If operation is not restored when the power supply has been cycled turn OFF the power supply and c
4. 00 Error code A400 021A Error information Error in Routing Tables A313 Error in Ethernet Address Tables Built in Ethernet error Probable cause Possible remedy A Built in Ethernet error has occurred A315 10 will turn See below ON to indicate where the error has occurred See below for details Error Information A315 10 is ON FINS TCP Connection Setup Error Confirm the connection setup and transfer Error code A400 When there is an error in TCP again 03CO connection setup including FINS TCP connection setup the error occurs A315 10 is ON Server Setup Error Transfer the server setup again Error code A400 When there is an error in server 03C1 setup including DNS server and SNTP server the error occurs A315 10 is ON Server Connection Error Confirm the connection between the Error code A400 When there is an error in connect servers 03C4 ing with server including DNS server and SNTP server the error occurs B Reference Information Error flag Built in Ethernet Error Flag A315 10 Other Non fatal Flag A402 00 Error code A400 03CO0 03C1 03C4 Error information Leftmost byte connection type A313 and number FINS TCP connec tion 01 to 03 Rightmost byte error causes Leftmost byte server type Rightmost byte error causes 597 Troubleshooting Section 12 2 12 2 6 Other Errors Communications Errors
5. SECTION 12 Troubleshooting This section provides information on hardware and software errors that occur during CP1L EL EM operation 12 1 Error Classification and Confirmation 00 00 0005 0005 586 12 27 Troubleshooting 3 9m ES C RRO EO ER C SECURUS 589 12 2 1 Error Processing Flowchart 0 00 00 00 eee eee 589 12 2 2 No Operation When Power Is Supplied 589 1222 3 Fatal Errors i er RR RAGA S AO RASA ROS RAL 590 1222 4 CPU BErtrors eth eb ob bate besa iene Oia een whe gah RAW 594 12 2 5 Non fatal Errors senus ea er eee teenies 595 12 2 6 Other Errors 5 20 A A RR RE RR e 598 12 3 Effor EOg e begeen5zeePeseenkeepbeePR SES EPUM EPIS PUES 600 12 4 Troubleshooting Unit Errors llle 601 585 Error Classification and Confirmation Section 12 1 12 1 Error Classification and Confirmation Error Categories Errors in CP1L EL EM CPU Units can be broadly divided into the following four categories Category Comments CPU Error A WDT watchdog timer error is generated in the CPU Unit the CPU Unit will malfunction and operation will stop CPU Standby The CPU will go on standby because conditions for stating oper ation have not yet been met Fatal Error Operation cannot continue Operation will stop due to a serious problem Non fatal Error A minor problem has occurred Operation will continue Confirming Errors There are two sources of inform
6. ation on errors that have occurred CPU Unit indicators Auxiliary Area CPU Unit Indicators These indicators show the operating status of the CPU Unit i POWER Lit Power is ON POWER green Not lit Power is OFF C RUN green Lit The CPU Unit is executing a program in either RUN or RUN MONITOR mode Not lit Operation is stopped in PROGRAM mode or due to a ERR ALM fatal error C ERR ALM Lit A fatal error or CPU error WDT error has occurred INH red operation will stop and all outputs will be turned OFF Flashing A non fatal error has occurred Operation will continue LNK ACT Not lit Operation is normal L INH orange Lit The Output OFF Bit A500 15 was turned ON All out BKUP puts will be turned OFF Not lit Operation is normal LNK ACT Lit A valid link is detected orange Flashing Communications either sending or receiving are in progress through the Ethernet port Not lit Other than the above BKUP Lit e The user program parameters or DM Area orange data is being written to or accessed in the See note built in flash memory backup memory The user program parameters DM Area data or DM initial values are being written to or accessed in a Memory Cassette The BKUP indicator also lights while the user program is being restored when the power supply is turned ON Not lit Other than the above Note Do not turn OFF the CPU Unit power
7. d Internal buffers full packet discarded Illegal packet discarded Local node busy send failed Unexpected routing error No setting in IP address table packet discarded FINS UDP packet discarded FINS TCP packet discarded 01 to 03 02 Connection number Reopened because remote node closed 03 Reopened because of reception error 04 Reopened because of transmission error 05 Reopened because RST received from remote node 06 Reopened because of no keep alive response 07 Illegal FINS TCP proce dure 08 Insufficient memory dur ing server processing 09 Insufficient memory dur ing client processing 0A Insufficient memory dur ing node switching Clock data write error 0001 Clock data cannot be refreshed because of a CPU Unit error 0002 Clock data cannot be refreshed because the current CPU mode do not support operation 599
8. d in the PLC Correct the PLC Setup with correct val Setup ues The address of the error is stored in A406 in 16 bit binary E Reference Information Error flag PLC Setup Error Flag A402 10 Error code A400 009B Error information PLC Setup error location A406 Option Board Errors Possible remedy A315 13 will turn ON if the Option Board Turn OFF the power supply and then is removed while the power is being sup install the Option Board again plied E Reference Information Error flags Option Board Error Flag A315 13 Other Non fatal Error Flag A402 00 Error code A400 Error information Battery Error Possible remedy If the PLC Setup is set to detect battery Check the battery connections errors this error will occur when there is an error in the battery in the CPU Unit i e the voltage is low or a battery is not mounted When using battery free operation dis able connecting battery errors in the PLC Setup 596 Troubleshooting Section 12 2 B Reference Information Error flag Battery Error Flag A402 04 Error code A400 00F7 Error information Logic Errors in Setting Table Probable cause Possible remedy An error occurs in routing table Transfer the relative setup again IP address table or IP router table B Reference Information Error flag Setting Table Logic Error Flag A315 11 Other Non fatal Flag A402
9. dy Illegal Area Access Error If the PLC Setup has been set to stop operation for an ille gal access error the Access Error Flag will turn ON when an illegal access error has occurred The following operations are considered illegal access Reading writing the parameter area Writing to an area without memory installed Writing to a write protected area Indirect DM addressing BCD error Refer to A298 and A299 instruction program address when the program fails and take corrective actions so that illegal area access errors will not occur Alternatively set the PLC Setup so that PLC operation will not stop when an instruc tion error occurs No END Error This error occurs when there is not an END 001 instruction in the program within a task Insert an END 001 instruction at the end of the program allocated to the task stored in A294 task number when the program fails Task Error This error is generated by any of the following conditions 1 There is not an executable cyclic task active 2 There is no specified interrupt task when an interrupt is generated input interrupt high speed counter interrupt scheduled interrupt or external interrupt 1 Check the properties of the executable cyclic task and set at least one task to start when operation starts 2 Create atask for the number stored in A294 task number when the program fails Differentiation Overflow Error Differentiation instructio
10. e A400 80E1 Error information Too Many I O Points Details A407 Program Error A program error indicates a problem with the user program Refer to the error information check the program and correct the mistakes Clear the error once the problem has been corrected Probable cause Possible remedy Instruction Processing Error Refer to A298 and A299 instruction program address when If the PLC Setup has been set to stop operation for an the program fails check the specifications for the relevant instruction error the Error Flag will be turned ON when an Instruction and set the correct operand data instruction cannot be executed due to a problem in the Alternatively set the PLC Setup to not stop operation for an operand data instruction error Indirect DM Addressing BCD Error Refer to A298 and A299 instruction program address when If the PLC Setup has been set to stop operation for an indi the program fails and correctly set the content for the indi rect DM BCD pn the Access Error Fao will turn ON when rectly addressed DM operand BCD mode to BCD or the content of an indirectly addressed DM operand is not Change the specified destination BCD although BCD mode has been selected Alternatively change the indirect addressing to binary mode or set the PLC Setup to not stop operation for an indi rect DM addressing BCD error 592 Section 12 2 Troubleshooting Probable cause Possible reme
11. e actions POWER indicator lit Not lit Lit RUN indicator lit ERR ALM indicator lit Not lit Flashing Check the power supply sections 12 2 2 and 12 3 ERR ALM indicator lit Not lit Lit There is no error in the CP1L EL EM A non fatal error has occurred Check for other causes A fatal error has occurred Refer to section 12 2 5 section 12 3 Refer to section 12 2 3 12 2 2 No Operation When Power Is Supplied First confirm that the POWER indicator green is lit POWER Indicator Not Lit The power supply may not match the Unit rating wiring may not be correct or the Unit may be faulty 1 2 3 1 Confirm the Unit rating i e is it 24 VDC and see if the supply power matches the rating Check the wiring to see if it is correct and that nothing is disconnected Check the voltage at the power supply terminals If the voltage is normal and the POWER indicator is not lit the Unit may be faulty In that case re place the Unit POWER Indicator Turns OFF and ON There may be fluctuations in the power supply voltage disconnected wiring or poor contacts Check the power supply system and wiring POWER Indicator Lit but No Operation Check the RUN indicator if the POWER indicator is lit but the CPU Unit does not operate The CPU Unit may be on standby if the RUN indicator is not lit 589 Troubleshooting Section 12 2 B CPU Standby Detection of Special I O Units and CPU Bus Units ha
12. heck that connections are proper and that there is no damage Probable cause Possible remedy An error occurred in data transfer between the CPU Unit Try cycling the power supply and an Expansion Unit or Expansion I O Unit If the problem persists turn OFF the power sup Note OAOA hex will be stored in A404 ply and check the Connecting Cables between the Units to see if they are connected properly Check the Unit connections to be sure they are ok e g that there is no damage After correcting the problem turn ON the power to the Units again E Reference Information Error flag I O Bus Error Flag A401 14 Error code A400 80C0 80CA 80CE 80CF Error information I O bus error details A404 0A0A Too Many I O Points The number of CP1W series Expansion Units and Expansion I O Units con nected exceeds the restriction for the number of Units or words for the system configuration Turn OFF the power supply and reconfigure the system within the restrictions Probable cause Possible remedy The number of CP1W series Expansion Units and Connect a maximum of three Expansion Units and Expansion I O Units exceeds the restriction Expansion I O Units to the CP1L EM4ODLI LI or CP1L EMSODL FLU Connect a maximum of one Expansion Unit or Expansion I O Unit to the CP1L EL20DLI B Reference Information Error flag Too Many I O Points Flag A401 11 Error cod
13. ion Error flag 588 FAL instruction executed A400 4101 to 42FF A402 15 Meaning Executed FAL number Address A360 to A391 Flash memory error 00F1 A315 15 Interrupt task error 008B A402 13 Interrupt task error unit number PLC Setup error 009B A402 10 Option Board error 00D1 00D2 A315 13 Error Option Board Flags Battery error 00F7 A402 04 Logic errors in setting table 021A A315 11 Routing tables error or Ethernet address tables error Built in Ether net error A315 10 FINS TCP con nection setup error An error in TCP connection setup including FINS TCP con nection setup Server setup error An error in server setup including DNS server and SNTP server Server connec tion error An error in connecting with server including DNS server and SNTP server Troubleshooting Section 12 2 12 2 Troubleshooting Use the following procedure to check error details and remove the cause of the error if the CPU Unit does not operate when the power supply is ON oper ation suddenly stops and the error indicator ERR ALM indicator lights or if the error indicator ERR ALM indicator flashes during operating 12 2 1 Error Processing Flowchart Confirm the error category by referring to the status of the CPU Unit indica tors investigate the cause for the error in the error tables and take correctiv
14. ns were repeatedly inserted or deleted using the online editor and the system restriction was exceeded Change the operating mode to PROGRAM mode and then return to MONITOR mode Illegal Instruction Error Execution of an unexecutable instruction was attempted For a CPU Unit with 20 I O Points the instruction operand will be given in D10000 to D31999 Check the program correct the problem and transfer the program to the CPU Unit again UM Overflow Error An attempt was made to execute a program that exceeds the user program capacity B Reference Information Error flag Transfer the program again using the CX Programmer Program Error Flag A401 09 Error code A400 80F0 Error information Cycle Time Too Long Program error details A294 to A299 Probable cause Possible remedy This error occurs when the cycle time PV exceeds the max imum cycle time set in the PLC Setup Review the program to decrease the cycle time or change the maximum cycle time set in the PLC Setup Refer to the Maximum Interrupt Task Processing Time A440 and study the maximum cycle time The cycle time can be decreased using the following meth ods Separate instructions not being executed into different tasks Consider using jump instructions for areas in the task that are not executed Prohibit cycle refreshing with Special I O Units that do not B Reference Information Err
15. or flag require exchange of cycle data Cycle Time Too Long Error A401 08 Error code A400 809F Error information 593 Troubleshooting Section 12 2 Errors Created with FALS Instructions Probable cause Possible remedy FALS instruction executed FALS number 001 C100 hex will be added to the FALS number 001 to 1FF hex and the result will be stored in A400 as the error code C100 to C2FF hex Check the conditions for executing FALS instructions and remove any causes for the user defined error B Reference Information Error flag FALS Error Flag A401 06 Error code A400 C101 to C2FF Error information Ethernet Controller Stop Error Probable cause Possible remedy ON when the Ethernet controller stops because of sum Cycle the power supply The Unit may be faulty Consult your value of MAC address error or controller error OMRON representative B Reference Information Error flag Ethernet Controller Stop Address Error A401 04 Error code A400 80F6 Error information 12 2 4 CPU Errors Lit Not lit A CPU error or fatal error may have occurred if the ERR ALM indicator lights during operation RUN mode or MONITOR mode the RUN indicator turns OFF and operation stops CPU Errors Possible remedy A WDT watchdog error occurred in the Cycle the power supply The Unit may be CPU Unit This does not occur in normal faul
16. s not been completed If a CPU Bus Unit has not started normally check the Unit Setup If a Special I O Unit is not detected replace the Special I O Unit 12 2 3 Fatal Errors B CPU Unit Indicators Lit Not lit There may be a CPU error or a fatal error if operation stops i e the RUN indi cator turns OFF and the ERR ALM indicator lights Data on fatal errors is displayed on the Error Tab Page of the CX Program mer s PLC Error Window Take corrective actions after checking error details based on the CX Program mer display message together with the Auxiliary Area Error Flags and error information Note 1 Errors are listed in order with the most serious errors first 2 If two or more errors occur at the same time the most serious error code will be stored in A400 3 I O memory will be cleared if a fatal error occurs except those created with FALS instructions 4 I O memory will be held when the I O Memory Hold Bit is ON but outputs will be turned OFF 590 Troubleshooting Section 12 2 Memory Errors Probable cause Automatic transfer from the Memory Cassette at startup failed because the required data is not on the Memory Cassette Possible remedy Store the required data on the Memory Cas sette An error has occurred in memory One or more bits in A403 will turn ON to indicate where the error has occurred See below for details Memory Error Location See
17. supply when this indicator is lit 586 Error Classification and Confirmation CPU Unit Indicators and Error Meanings in RUN or MONITOR Mode Indicator Auxiliary Area CPU Lit error Lit Fatal error error Lit Non fatal Section 12 1 Output OFF Bit turned ON Not lit Not lit Not lit Lit Not lit Not lit B Error Code Storage Word The error code is stored in A400 when an error occurs If two or more errors occur at the same time the most serious error will be stored B Error Flags Flags that indicate the type of error are allocated in the Auxiliary Area E Error Information This area indicates specific information on the meaning of error flags and pro vides information on error location and error details E Fatal Errors Error code Error flag Error information A400 Meaning Address Memory error 80F1 A401 15 Memory error A403 location I O bus error 80CO0 to 80C7 A401 14 O bus error A404 80CA 80CE details 80CF Too many I O error 80E1 A401 11 Details for too A407 many I O error Program error 80F0 A401 09 Program error A294 to A299 details Cycle time too long 809F A401 08 error FALS instruction C101 to C2FF A401 06 executed Ethernet address 80F6 A401 04 p error 587 Error Classification and Confirmation Section 12 1 B Non fatal Errors Error code Error informat
18. ty Consult your OMRON representa use tive B Reference Information Error flag None Error code A400 None Error information None 594 Troubleshooting Section 12 2 Note Just as when a CPU error occurs the RUN indicator will turn OFF and the ERR ALM indicator will light when a fatal error occurs Connecting the CX Programmer however is possible for fatal errors but not for CPU errors If the CX Programmer cannot be connected online a CPU error has probably occurred 12 2 5 Non fatal Errors A non fatal error has occurred if both the RUN indicator and the ERR ALM indicator are lit during operation i e in RUN or MONITOR mode B CPU Unit Indicators Lit Lit Flashing Information on the non fatal error can be obtained from the Error Tab Page of the CX Programmer s PLC Error Window Take corrective actions after check ing error details using the display messages and the Auxiliary Area Error Flags and error information Errors are listed in the following table in order with the most serious ones first If two or more errors occur at the same time the most serious error code will be stored in A400 Errors Created with for FAL Instructions A FAL instruction was executed in the program to create a non fatal error Probable cause Possible remedy The executed FAL number 001 to 511 will be stored in A360 to A391 The number 4 will be added to the front of 101 to 2FF
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