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System Variable Comparison (KEYENCE KV-X / OMRON NJ/NX)
This table lines up, by function, the "system variables" of the KEYENCE KV-X500/X300 series and the "system-defined variables" of the OMRON NJ/NX series, both IEC 61131-3 compliant PLCs. Where NJ/NX has no system-defined variable, or the variable cannot be used directly from a user program, the instruction you can use instead is listed as "... instruction". Use it as a reference when migrating models or reading another manufacturer's PLC programs. For the meaning of the symbols, see the legend at the end of the page.
Clock
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Current date and time | _CurrentDateTime | ARRAY[0..5] OF UINT | _CurrentTimeor GetTime instruction | DATE_AND_TIME | |
| Current date and time (year) | _CurrentDateTime[0] | UINT | _CurrentTime | DATE_AND_TIME | |
| Current date and time (month) | _CurrentDateTime[1] | UINT | _CurrentTime | DATE_AND_TIME | |
| Current date and time (day) | _CurrentDateTime[2] | UINT | _CurrentTime | DATE_AND_TIME | |
| Current date and time (hour) | _CurrentDateTime[3] | UINT | _CurrentTime | DATE_AND_TIME | |
| Current date and time (minute) | _CurrentDateTime[4] | UINT | _CurrentTime | DATE_AND_TIME | |
| Current date and time (second) | _CurrentDateTime[5] | UINT | _CurrentTime | DATE_AND_TIME | |
| Day of week | _DayOfWeek | UINT | GetDayOfWeek instruction | — | |
| Clock error | _ProgramInfo.TimeError | BOOL | — | — | |
Always ON/OFF and clock pulses
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Always ON | _AlwaysOn | BOOL | P_On | BOOL | |
| Always OFF | _AlwaysOff | BOOL | P_Off | BOOL | |
| 10 ms clock pulse | _Clock10ms | BOOL | Get10msClk instruction | — | |
| 100 ms clock pulse | _Clock100ms | BOOL | Get100msClk instruction | — | |
| 1 s clock pulse | _Clock1s | BOOL | Get1sClk instruction | — | |
First scan and execution status
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| ON for 1 scan at start of operation | _FirstScanOn | BOOL | P_First_RunMode | BOOL | |
| OFF for 1 scan at start of operation | _FirstScanOff | BOOL | — | — | |
| Module/program first execution | _ProgramFirstRun | BOOL | — | — | |
| FB first execution | _ProgramFirstRun | BOOL | — | — | |
| ON for 1 scan when module execution starts | _ModuleFirstScanOn | BOOL | P_First_Run | BOOL | |
| OFF for 1 scan when module execution starts | _ModuleFirstScanOff | BOOL | — | — | |
| Module/program executing | _MD_(ModuleName) | BOOL | _<TaskName>_Activeor PrgStatusor Task_IsActive instruction | BOOL | |
Scan time and task time
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Program execution information (structure) | _ProgramInfo | _PROGRAM_INFO | — | — | |
| Current scan time | .ScanTime | UDINT | _<TaskName>_LastExecTimeor GetMyTaskStatus instruction | TIME | |
| Minimum task execution time | .MinScanTime | UDINT | _<TaskName>_MinExecTimeor GetMyTaskStatus instruction | TIME | |
| Maximum scan time | .MaxScanTime | UDINT | _<TaskName>_MaxExecTimeor GetMyTaskStatus instruction | TIME | |
| Clear min/max scan time | .ScanTimeMaxMinClear | BOOL | — | — | |
| Measured END processing time | .EndProcTime | UDINT | — | — | |
| Constant scan time setting | .FixScanTimeSet | UDINT | GetMyTaskInterval instruction | — | |
| END processing time setting | .EndProcTimeSet | UDINT | — | — | |
| Constant scan time operation enabled | .FixScanTimeEnable | BOOL | — | — | |
| END processing time setting enabled | .FixEndProcTimeEnable | BOOL | — | — | |
| Set time exceeded | .FixTimeExcess | BOOL | _<TaskName>_Exceededor GetMyTaskStatus instruction | BOOL | |
| Scan time when setting exceeded | .ExcessConstantScanTime | UDINT | — | — | |
| END processing time when setting exceeded | .ExecssEndProcTime | UDINT | — | — | |
| Task execution count | — | — | _<TaskName>_ExecCountor GetMyTaskStatus instruction | UDINT | |
| Task period exceeded count | — | — | _<TaskName>_ExceedCountor GetMyTaskStatus instruction | UDINT | |
Free-running counter
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| 1 ms free-running counter | _FreeRunCounter1ms | UDINT | Get1msCnt instruction | — | |
| 10 µs free-running counter | _FreeRunCounter10us | UDINT | — | — | |
| 1 µs free-running counter | _FreeRunCounter1us | UDINT | Get1usCnt instruction | — | |
| 100 ns free-running counter | _FreeRunCounter100ns | UDINT | Get100nsCnt instruction | — | |
Errors and faults
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Error control (structure) | _ErrorCtrl | _ERROR_CTRL | _ErrStaor GetPLCError instruction | WORD | |
| Major error occurring | .Error | BOOL | _ErrStaor Level=2 of the GetPLCError instruction | WORD | |
| Minor error occurring | .Warning | BOOL | _ErrStaor Level=3 of the GetPLCError instruction | WORD | |
| Clear current error | .ClearCurrentError | BOOL | ResetPLCError instruction | — | |
| Clear error history | .ClearHistory | BOOL | Clear the event log from Sysmac Studio or an HMI (no instruction) | — | |
| Operation error details | _ProgramInfo.ProgramErrorDetail | UINT | Check with the instruction's ErrorID output or the event log | — | |
| Latest major error details (structure) | _NewestError | _ERROR_DETAIL | GetPLCError instruction | — | |
| Latest major error: year/month | .YearMonth | UINT | — | — | |
| Latest major error: day | .Day | UINT | — | — | |
| Latest major error: hour | .Hour | UINT | — | — | |
| Latest major error: minute | .Minute | UINT | — | — | |
| Latest major error: second | .Second | UINT | — | — | |
| Latest major error: error code | .ErrorNumber | UINT | GetPLCError instruction | — | |
| Latest major error: number of valid data | .ValidCount | UINT | — | — | |
| Latest major error: detail information 01 to 20 | .Detail | ARRAY[0..19] OF UINT | — | — | |
| Latest minor error details (structure) | _NewestWarning | _ERROR_DETAIL | GetPLCError instruction | — | |
| Latest minor error: year/month | .YearMonth | UINT | — | — | |
| Latest minor error: day | .Day | UINT | — | — | |
| Latest minor error: hour | .Hour | UINT | — | — | |
| Latest minor error: minute | .Minute | UINT | — | — | |
| Latest minor error: second | .Second | UINT | — | — | |
| Latest minor error: error code | .ErrorNumber | UINT | GetPLCError instruction | — | |
| Latest minor error: number of valid data | .ValidCount | UINT | — | — | |
| Latest minor error: detail information 01 to 20 | .Detail | ARRAY[0..19] OF UINT | — | — | |
| User-defined error status | — | — | _AlarmFlagSetAlarm / GetAlarm / ResetAlarm instructions | WORD | |
| PLC Function Module error status | — | — | _PLC_ErrStaGetPLCError / ResetPLCError instructions | WORD | |
Self-diagnosis and power
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Battery error | _ProgramInfo.BackupBattError | BOOL | _SelfTest_LowBattery | BOOL | |
| Overcurrent protection disabled | _ProgramInfo.OCPDisabled | BOOL | — | — | |
| CPU internal temperature too high | — | — | _SelfTest_HighTemperature | BOOL | |
| Fan speed low | — | — | _SelfTest_LowFanRevolution | BOOL | |
| Non-volatile memory life warning | — | — | _StorageDeteriorated | BOOL | |
| Power-on time | — | — | _PowerOnHouror PLC_ReadTotalPowerOnTime instruction | UDINT | |
| Number of power interruptions | — | — | _PowerOnCount | UDINT | |
| Power-interruption retention failed | — | — | _RetainFail | BOOL | |
| Power-interruption retention not executed | — | — | _RetainUnexec | BOOL | |
| Device output hold setting | — | — | _DeviceOutHoldCfg | WORD | |
| Device output hold status | — | — | _DeviceOutHoldStatus | BOOL | |
Operation flags and instruction errors
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Comparison result (less than) | _CalcResultNeg | BOOL | Output of the Cmp instruction | — | |
| Comparison result (equal) | _CalcResultEqual | BOOL | Output of the Cmp instruction | — | |
| Comparison result (greater than) | _CalcResultPos | BOOL | Output of the Cmp instruction | — | |
| Carry flag | — | — | P_CY | BOOL | |
| Program execution error (module) | _ProgramError | BOOL | P_PRGER | BOOL | |
| Internal register (module) | _InternalRegister | ARRAY[0..3] OF UINT | — | — | |
| Program execution error (FB) | _ProgramError | BOOL | P_PRGER | BOOL | |
| Internal register (FB) | _InternalRegister | ARRAY[0..3] OF UINT | — | — | |
| Program execution error (FUN) | _ProgramError | BOOL | P_PRGER | BOOL | |
| Internal register (FUN) | _InternalRegister | ARRAY[0..3] OF UINT | — | — | |
| Function return value | FunctionName | (as defined by the FUN) | — | — | |
Logging and tracing
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Logging and tracing (array of structures) | _LoggingTrace | ARRAY[0..9] OF _LOGGING_TRACE | — | — | |
| Logging/trace: operation enabled | .ExecEnable | BOOL | — | — | |
| Logging/trace: in progress | .InOperation | BOOL | — | — | |
| Logging/trace: file write finished | .FileWriteEnd | BOOL | — | — | |
| Logging/trace: buffer below 50% warning | .BufferHalfAlm | BOOL | — | — | |
| Logging/trace: buffer overflow | .BufferOverflow | BOOL | — | — | |
| Logging/trace: written during RUN | .WriteDuringRun | BOOL | — | — | |
| Logging/trace: logging/trace error | .LoggingTraceError | BOOL | — | — | |
| Logging/trace: insufficient memory error | .NoMemoryCapacity | BOOL | — | — | |
| Logging/trace: device/trigger setting error | .DeviceTriggerSetError | BOOL | — | — | |
| Logging/trace: file save trigger monitor | .FileSaveTriggerMonitor | BOOL | — | — | |
| Logging/trace: data acquisition complete | .DataAcquireComplete | BOOL | — | — | |
| Logging/trace: minimum free buffer space | .MinBufferSpace | UINT | — | — | |
| Logging/trace: ring buffer free space | .LoopBufferSpace | UINT | — | — | |
| Logging/trace: file save counter | .FileSavingCounter | UINT | — | — | |
| Logging/trace: ID 1 to 9 assignment | _LoggingTrace[1..9] | — | — | — | |
| Logging and tracing (array of structures) | — | — | _PLC_TraceSta[0..3]or GetTraceStatus / TraceSamp / TraceTrig instructions | _sTRACE_STA | |
| Logging/trace: in progress | — | — | .IsStartor GetTraceStatus | _sTRACE_STA BOOL | |
| Logging/trace: logging/trace error | — | — | .ParamError GetTraceStatus | _sTRACE_STA BOOL | |
| Trace trigger monitor flag | — | — | .IsTriggeror GetTraceStatus | _sTRACE_STA BOOL | |
| Trace completed flag | — | — | .IsCompleteor GetTraceStatus | _sTRACE_STA BOOL | |
| Safety data logging | — | — | _PLC_SFLogSta | ARRAY[0..1] OF _sSFLOG_STA | |
Operation recording
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Operation recording (array of structures) | _OperationRecorder | ARRAY[0..3]OF _OPERATION_RECORDER | — | — | |
| Operation recording: save request | .SaveRequest | BOOL | — | — | |
| Operation recording: in progress | .InAction | BOOL | — | — | |
| Operation recording: file save trigger occurred | .SaveTriggerMonitor | BOOL | — | — | |
| Operation recording: saving file | .SaveBusy | BOOL | — | — | |
| Operation recording: collecting data | .Collecting | BOOL | — | — | |
| Operation recording: setting error | .SettingError | BOOL | — | — | |
| Operation recording: file save complete | .SaveComplete | BOOL | — | — | |
| Operation recording: file save error | .SaveError | BOOL | — | — | |
| Operation recording: insufficient recording buffer | .BufferShortage | BOOL | — | — | |
| Operation recording: save entire buffer mode | .BufferAllSaveMode | BOOL | — | — | |
| Operation recording: average sampling period | .AverageSamplingPeriod | DINT | — | — | |
| Operation recording: average number of changed devices | .AverageChangedDeviceNum | DINT | — | — | |
| Operation recording: collectable period | .MaxCollectingPeriod | DINT | — | — | |
| Operation recording: file save completion code | .SaveFinCode | UINT | — | — | |
| Operation recording: file save counter | .SaveCounter | UINT | — | — | |
| Operation recording: save progress detail 1 | .SaveProgressInfo1 | UINT | — | — | |
| Operation recording: save progress detail 2 | .SaveProgressInfo2 | UINT | — | — | |
| Operation recording: save progress | .SaveProgress | UINT | — | — | |
| Operation recording: save file path | .SavePath | STRING[320] | — | — | |
| Operation recording: ID 1 to 3 assignment | _OperationRecorder[1..3] | — | — | — | |
Automation Playback
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Switch collection settings | — | — | APB_ChangeSamplingSettings instruction | UINT | |
| APB service status | — | — | _APB_Status.Status | UINT | |
| Date/time of latest save trigger | — | — | _APB_SysInfo.LatestTrigTime | DATE_AND_TIME | |
| APB service status | — | — | _APB_Status.Status | UINT | |
| APB instruction error code | — | — | _APB_Status.LatestErrorID | WORD | |
| Date/time of latest variable log output | — | — | _APB_Status.LatestLogTime | DATE_AND_TIME | |
| APB service event code | — | — | _APB_Status.LatestEventCode | DWORD | |
| Average sampling time | — | — | _APB_SmplInfo.SmplTimeAve | UDINT | |
| Average variable change rate | — | — | _APB_SmplInfo.VarChgRateAve | UINT | |
| Average variable log collectable time | — | — | _APB_SmplInfo.LogDurationTimeAve | UINT | |
| Variable log file save directory | — | — | _APB_SysInfo.LogFileDir | STRING[80] | |
Display (Access Window)
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Access Window (structure) | _AccessWindow | _ACCESS_WINDOW | — | — | |
| Access Window: Up key pressed | .UpKeyPressed | BOOL | — | — | |
| Access Window: Down key pressed | .DownKeyPressed | BOOL | — | — | |
| Access Window: Left key pressed | .LeftKeyPressed | BOOL | — | — | |
| Access Window: Right key pressed | .RightKeyPressed | BOOL | — | — | |
| Access Window: MENU key pressed | .MenuKeyPressed | BOOL | — | — | |
| Access Window: ENTER key pressed | .EnterKeyPressed | BOOL | — | — | |
| Access Window: user message displayed | .UserMessageDisplayed | BOOL | — | — | |
| Access Window: blink | .BlinkLine | ARRAY[1..4] OF BOOL | — | — | |
| Access Window: display user message | .DisplayUserMessage | ARRAY[1..63] OF BOOL | — | — | |
| Access Window: user message number | .UserMessageDisplayID | UINT | — | — | |
| Access Window: initial display language setting | .InitialDispLangSetting | UINT | — | — | |
| Access Window: initial comment number setting | .InitialCommentNumberSetting | UINT | — | — | |
| Access Window: operation prohibit setting | .WindowOperationDisable | UINT | — | — | |
| Access Window: initial screen setting enabled | .InitScreenSetValid | UINT | — | — | |
| Access Window: initial screen device type | .InitScreenSetDeviceType | UINT | — | — | |
| Access Window: initial screen ID | .InitScreenSetScreenID | UDINT | — | — | |
| Access Window: initial screen device number | .InitScreenSetDeviceNumber | UDINT | — | — | |
| Access Window: initial screen display format | .InitScreenSetDisplayFormat | UINT | — | — | |
| Access Window: initial screen device notation | .InitScreenSetDeviceDisplay | UINT | — | — | |
| Access Window: initial screen key lock status | .InitScreenSetKeyLockStatus | UINT | — | — | |
Project information and versions
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Project information (structure) | _ProjectInfo | _PROJECT_INFO | — | — | |
| Project name | .ProjectName | STRING[64] | — | — | |
| Number of sensor setting instructions executed | .SensorInstExecCount | UINT | — | — | |
| Consecutive project password authentication failures | .PrjPasswordCertFailCount | UINT | — | — | |
| Cumulative project password authentication failures | .PrjPasswordCertFailTotal | UINT | — | — | |
| Project password authentication prohibited | _ProgramInfo.ProjectPasswordAuthDisabled | BOOL | — | — | |
| CPU function version | .CpuFuncVersion | UINT | — | — | |
| Project function version | .ProjectVersion | UINT | — | — | |
| Unit version | — | — | _UnitVersion | ARRAY[0..1] OF USINT | |
| Configured unit version | — | — | _ProjectUnitVersion | ARRAY[0..1] OF USINT | |
| Hardware revision | — | — | _HardwareRevision | STRING[2] | |
Storage (memory card / SD card)
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Storage (structure) | _Storage | _STORAGE | — | — | |
| Memory card mount request | .MemCardMountReq | BOOL | — | — | |
| Memory card unmount request | .MemCardUnmountReq | BOOL | — | — | |
| Memory card in use | .MemCardInUse | BOOL | _Card1Access | BOOL | |
| Memory card recognition complete | .MemCardRecognized | BOOL | _Card1Ready | BOOL | |
| Memory card present | .MemCardExist | BOOL | — | — | |
| CPU memory mount request | .CpuMemoryMountReq | BOOL | — | — | |
| CPU memory unmount request | .CpuMemoryUnmountReq | BOOL | — | — | |
| CPU memory in use | .CpuMemoryInUse | BOOL | — | — | |
| CPU memory recognition complete | .CpuMemoryRecognized | BOOL | — | — | |
| Auto load | .AutoLoad | _AUTOLOAD_CTRL | — | — | |
| Folder number | .FolderNumber | UINT | — | — | |
| Completed folder number | .CompleteFolderNumber | UINT | — | — | |
| Completion code | .FinCode | UINT | — | — | |
| Run load | .RunLoad | _AUTOLOAD_CTRL | — | — | |
| Folder number | .FolderNumber | UINT | — | — | |
| Completed folder number | .CompleteFolderNumber | UINT | — | — | |
| Completion code | .FinCode | UINT | — | — | |
| Project save | .ProjectSave | _PROJECT_RECIPE_SAVE_LOAD | — | — | |
| Execute request | .Request | BOOL | — | — | |
| Executing | .Busy | BOOL | — | — | |
| Execution complete | .Complete | BOOL | — | — | |
| Execution failed | .Error | BOOL | — | — | |
| Drive number | .DriveNumber | UINT | — | — | |
| Folder number | .FolderNumber | UINT | — | — | |
| Completed drive number | .CompleteDriveNumber | UINT | — | — | |
| Completed folder number | .CompleteFolderNumber | UINT | — | — | |
| Completion code | .FinCode | UINT | — | — | |
| Project load | .ProjectLoad | _PROJECT_RECIPE_SAVE_LOAD | — | — | |
| Execute request | .Request | BOOL | — | — | |
| Executing | .Busy | BOOL | — | — | |
| Execution complete | .Complete | BOOL | — | — | |
| Execution failed | .Error | BOOL | — | — | |
| Drive number | .DriveNumber | UINT | — | — | |
| Folder number | .FolderNumber | UINT | — | — | |
| Completed drive number | .CompleteDriveNumber | UINT | — | — | |
| Completed folder number | .CompleteFolderNumber | UINT | — | — | |
| Completion code | .FinCode | UINT | — | — | |
| Recipe save | .RecipeSave | _RECIPE_SAVE | FileWriteVar instruction | — | |
| Execute request | .Request | BOOL | — | — | |
| Executing | .Busy | BOOL | — | — | |
| Execution complete | .Complete | BOOL | — | — | |
| Execution failed | .Error | BOOL | — | — | |
| Drive number | .DriveNumber | UINT | — | — | |
| Reference folder number | .InputFolderNumber | UINT | — | — | |
| Output folder number | .OutputFolderNumber | UINT | — | — | |
| Completion code | .FinCode | UINT | — | — | |
| Recipe load | .RecipeLoad | _PROJECT_RECIPE_SAVE_LOAD | FileWriteVar instruction | — | |
| Execute request | .Request | BOOL | — | — | |
| Executing | .Busy | BOOL | — | — | |
| Execution complete | .Complete | BOOL | — | — | |
| Execution failed | .Error | BOOL | — | — | |
| Drive number | .DriveNumber | UINT | — | — | |
| Folder number | .FolderNumber | UINT | — | — | |
| Completed drive number | .CompleteDriveNumber | UINT | — | — | |
| Completed folder number | .CompleteFolderNumber | UINT | — | — | |
| Completion code | .FinCode | UINT | — | — | |
| Save to CPU memory | .CpuMemorySave | _CPU_MEMORY_SAVE | — | — | |
| Execute request | .Request | BOOL | — | — | |
| Executing | .Busy | BOOL | — | — | |
| Execution complete | .Complete | BOOL | — | — | |
| Execution failed | .Error | BOOL | — | — | |
| Storage FB RAM mode | .StorageFBIsRAMMode | BOOL | — | — | |
| Project backup in progress | .ProjectBackupBusy | BOOL | — | — | |
| Logging/trace in progress | .LoggingTraceBusy | BOOL | — | — | |
| Logging internal buffer overflow | .LoggingInternalBufferOverflow | BOOL | — | — | |
| Power OFF during storage access | .PowerOffDuringStorageAccess | UINT | — | — | |
| Memory card retry count | .MemoryCardRetryCount | UINT | — | — | |
| Memory card verify error count | .MemoryCardErrorCount | UINT | — | — | |
| Reset delay time on memory card error | .MemoryCardResetDelay | UINT | — | — | |
| CPU memory usage | .UsageCpuMemory | UDINT | — | — | |
| SD Memory Card program transfer command | — | — | _Card1PrgTransferCmd | _sPRGTRANSFER_CMD | (※1) |
| SD Memory Card program transfer command: start | — | — | .Exec | BOOL | |
| Directory name | — | — | .DirName | _sPRGTRANSFER_CMD STRING[64] | (※2) |
| Password | — | — | .Password | — | |
| User program and settings transfer flag | — | — | .TargetUserProgram | — | |
| IP address transfer flag | — | — | .TargetIPAdr | — | |
| Variable present value (retained only) transfer flag | — | — | .TargetVariable | — | |
| CJ Unit memory present value (retained memory only) transfer flag | — | — | .TargetMemory | — | |
| SD Memory Card program transfer status | — | — | _Card1PrgTransferSta | — | |
| SD Memory Card program transfer: complete | — | — | .Done | — | |
| SD Memory Card program transfer: executing | — | — | .Active | — | |
| SD Memory Card program transfer: error | — | — | .Err | _sPRGTRANSFER_STA BOOL | |
| Project save | — | — | _Card1BkupCmdor BackupToMemoryCard instruction | _sBKUP_CMD | (※3) |
| Project save: execute request | — | — | .ExecBkupor BackupToMemoryCard instruction | _sBKUP_CMD BOOL | |
| Project save: executing | — | — | _Card1BkupSta.Activeor BackupToMemoryCard instruction | _sBKUP_STA BOOL | |
| Project save: execution complete | — | — | _Card1BkupSta.Doneor BackupToMemoryCard instruction | _sBKUP_STA BOOL | |
| Project save: execution failed | — | — | _Card1BkupSta.Error BackupToMemoryCard instruction | _sBKUP_STA BOOL | |
| Project save: folder number | — | — | .DirNameor BackupToMemoryCard instruction | _sBKUP_CMD STRING[64] | |
| Restore command | — | — | _Card1RestoreCmd | _sRESTORE_CMD | (※4) |
| Restore start flag | — | — | .Exec | _sRESTORE_CMD BOOL | |
| Restore: directory name | — | — | .DirName | _sRESTORE_CMD STRING[64] | |
| Restore: password | — | — | .Password | — | |
| Restore status | — | — | _Card1RestoreSta | _sRESTORE_STA | |
| Restore: executing flag | — | — | .Active | _sRESTORE_STA BOOL | |
| Restore: completed flag | — | — | .Done | _sRESTORE_STA BOOL | |
| Restore: error flag | — | — | .Err | _sRESTORE_STA BOOL | |
| Backup function executing flag | — | — | _BackupBusy | BOOL | |
| Power interrupted during SD Memory Card access flag | — | — | _Card1PowerFail | BOOL | |
| SD Memory Card write protect flag | — | — | _Card1Protect | BOOL | |
| SD Memory Card error flag | — | — | _Card1Err | BOOL | |
| SD Memory Card life warning flag | — | — | _Card1Deteriorated | BOOL | |
| SD Memory Card storage capacity | — | — | _Card1Capacity | UDINT | |
| SD Memory Card storage usage | — | — | _Card1Used | UDINT | |
| Backup cancel flag | — | — | .CancelBkup | _sBKUP_CMD BOOL | |
| Verify start flag | — | — | .ExecVefy | _sBKUP_CMD BOOL | |
| (structure) | — | — | _Card1VefySta | _sVEFY_STA | |
- (*1) NJ: there is no instruction that executes a program transfer (_Card1PrgTransferCmd is commanded via CIP message communication)
- (*2) KV: folder number (UINT) / NJ: directory name (STRING)
- (*3) _Card1BkupCmd cannot be used in user programs. From a program, use the BackupToMemoryCard instruction
- (*4) _Card1RestoreCmd is commanded via CIP message communication
Expansion units and I/O bus
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Expansion unit (structure) | _ExpansionUnit | _EXPANSION_UNIT | — | — | |
| Expansion unit connection | .Connected | ARRAY[0..48]OF BOOL | — | — | |
| Load option | .LoadOption | ARRAY[0..48]OF BOOL | — | — | |
| Number of connected expansion units | .UnitNumber | UINT | — | — | |
| Expansion unit device address | _UnitIdAdr[0..48] | ARRAY[0..48] OF _UNIT_ID_ADR | — | — | |
| Expansion unit device address: UnitNo | .UnitNo | UINT | — | — | |
| Expansion unit device address: RelayAdr | .RelayAdr | UDINT | — | — | |
| Expansion unit device address: DmAdr | .DmAdr | UDINT | — | — | |
| NX Unit I/O data communicating | — | — | GetNXBError / GetNXUnitError / ResetNXBError instructions | — | |
| I/O bus unit error status | — | — | GetXBError / GetXBUnitError instructions | — | |
| NX Unit registration status | — | — | _NXB_UnitRegTbl | ARRAY [0..32] OF BOOL | |
| Maximum NX Unit number | — | — | _NXB_MaxUnitNo | UINT | |
| NX Unit I/O data active status | — | — | _NXB_UnitIOActiveTbl | ARRAY [0..32] OF BOOL | |
| NX Bus Function Module error status | — | — | _NXB_ErrSta | WORD | |
| I/O bus error status | — | — | _CJB_ErrSta | WORD | |
| I/O bus unit error status | — | — | _CJB_UnitErrSta | ARRAY [0..3, 0..9] OF WORD | |
| X Bus Function Module error status | — | — | _XBU_ErrSta | WORD | |
Inter-unit synchronization
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Inter-unit synchronization (structure) | _UnitSynchronize | _UNIT_SYNCHRONIZE | — | — | |
| Inter-unit synchronization: refresh start time | .RefreshStartTimeDelay | UDINT | — | — | |
| Inter-unit synchronization: refresh end time | .RefreshFinishTimeDelay | UDINT | — | — | |
| Inter-unit synchronization: maximum start time | .RefreshStartTimeMaxDelay | UDINT | — | — | |
| Inter-unit synchronization: maximum end time | .RefreshFinishTimeMaxDelay | UDINT | — | — | |
| Inter-unit synchronization: refresh execution time | .RefreshExecutionTime | UDINT | — | — | |
| Inter-unit synchronization: refresh time exceeded | .RefreshIntervalOver | BOOL | — | — | |
Communication and networks
| Name | KEYENCE KV-X | OMRON NJ/NX | Remarks | ||
|---|---|---|---|---|---|
| Variable name | Data type | Variable / instruction | Data type | ||
| Number of ports used | — | — | _Port_numUsingPort | USINT | |
| Network communication instruction enabled | — | — | _Port_isAvailable | BOOL | |
| FINS/TCP connection status | — | — | _FINSTCPConnSta | WORD | |
| EtherNet/IP error | — | — | _EIP_ErrStaor GetEIPError instruction | WORD | |
| EtherNet/IP online | — | — | _EIP_EtnOnlineSta | BOOL | |
| Tag data link communicating | — | — | _EIP_TDLinkRunSta | BOOL | |
| Tag data link communication start switch | — | — | _EIP_TDLinkStartCmd | BOOL | |
| EtherCAT error | — | — | _EC_ErrStaor GetECError / ResetECError instructions | WORD | |
| EtherCAT process data communication status | — | — | _EC_PDActive | BOOL | |
| Motion control error status | — | — | _MC_ErrStaGetMCError / ResetMCError instructions | WORD | |
| Option board status | — | — | _PLC_OptBoardSta | ARRAY[1..2] OF _sOPTBOARD_STA | |
No matching variables found.
Legend
| — | No corresponding system variable / system-defined variable / instruction |
|---|---|
| ... instruction | An instruction that can be used on NJ/NX instead of a system-defined variable (instructions described in the Instructions Reference Manual, Basic) |
| XX or YY instruction | Can be obtained with either a system-defined variable or an instruction. If the system-defined variable cannot be used in a user program, use the instruction |
| .MemberName | A member of a structure variable, indented under the row of its parent structure variable (e.g. .ScanTime under _ProgramInfo = _ProgramInfo.ScanTime). Hover to see the full name. You can also search by full name |
| [0..n] | Array variable. On KV, _LoggingTrace[1..9] etc. are assigned from ID 1 onward |
| <TaskName> | Replaced by the NJ/NX task name, e.g. _PrimaryTask_LastExecTime |
How rows are organized
- Rows are based on the KV-X system variables, with each structure member on its own row. Major variables that exist only on NJ/NX are added at the end of each category.
- Where KV-X and NJ/NX differ in units or types (e.g. scan time vs. task execution time), items with a similar purpose are still listed on the same row.
Scope
- KV-X: covers the global and local variables listed in the appendix "System Variable List" of the KV-X500 Series User's Manual. CR/CM assignments are omitted.
- NJ/NX: focuses on variables for the overall system and the PLC Function Module. For EtherCAT (_EC), EtherNet/IP (_EIP), motion (_MC) and the I/O bus (_CJB/_NXB/_XBU), only representative variables are listed.
- Some NJ/NX system-defined variables cannot be used in user programs (for example, those dedicated to data tracing or CIP message communication).
- Variable and instruction specifications and availability vary by CPU model and version. Check each manufacturer's manual before actual use.
Sources
- KEYENCE: KV-X500 Series User's Manual 084A03 (March 2026), Appendix 2 "System Variable List"
- OMRON: NJ/NX-series CPU Unit Software User's Manual SBCA-467AE (April 2026), A-8 "System-defined Variable List" and A-9 "Specifications for Individual System-defined Variables"
- OMRON: NJ/NX-series Instructions Reference Manual, Basic, SBCA-468Y (October 2025)
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