Function / Function Block Comparison (KEYENCE KV-X / OMRON NJ/NX)

A cross-reference table that lines up, by function, the functions (FUN) and function blocks (FB) of the KEYENCE KV-X500/X300 series and the OMRON NJ/NX series, both IEC 61131-3 compliant PLCs. "★IEC" marks IEC 61131-3 standard functions/FBs, which can generally be used with the same arguments. For proprietary instructions, instructions with similar functions are listed side by side and the differences are given in the remarks. 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.

Edge detection and latching

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Rising edge differentiation	★IEC	`R_TRIG`	`R_TRIG`
Falling edge differentiation	★IEC	`F_TRIG`	`F_TRIG`
	NJ only	—	`Up`
	NJ only	—	`Down`
Set-priority keep	★IEC	`SR`	`SR`
Reset-priority keep	★IEC	`RS`	`RS`

Bit operations

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Bit test	Similar	`BitLoad`	`TestABit`
Bit test NOT	NJ only	—	`TestABitN`
1-bit set	Similar	`BitSet`	`SetABit`
1-bit reset	Similar	`BitReset`	`ResetABit`
1-bit out	NJ only	—	`OutABit`
Multiple bit set	NJ only	—	`SetBits`
Multiple bit reset	NJ only	—	`ResetBits`
N-bit read group	NJ only	—	`ReadNbit_**`
N-bit write group	NJ only	—	`WriteNbit_**`

Comparison

Name	Category	KEYENCE KV-X	OMRON NJ/NX	Remarks
=	★IEC	`EQ`	`EQ=`	Inputs: KV: 2 to 10 / NJ: 2 to 5
<>	★IEC	`NE`	`NE<>`
<	★IEC	`LT`	`LT<`	Inputs: KV: 2 to 10 / NJ: 2 to 5
<=	★IEC	`LE`	`LE<=`	Inputs: KV: 2 to 10 / NJ: 2 to 5
>	★IEC	`GT`	`GT>`	Inputs: KV: 2 to 10 / NJ: 2 to 5
>=	★IEC	`GE`	`GE>=`	Inputs: KV: 2 to 10 / NJ: 2 to 5
Area comparison	Similar	`ZoneCmp`	`ZoneCmp`
Comparison	NJ only	—	`Cmp`
String comparison EQ	Partial	`StringCmp`	`EQascii`	Inputs: KV: 2 / NJ: 2 to 5
String comparison NE	NJ only	—	`NEascii`
String comparison LT	NJ only	—	`LTascii` `LEascii` `GTascii` `GEascii`
Table comparison	NJ only	—	`TableCmp`
Array batch comparison EQ	NJ only	—	`AryCmpEQ` `AryCmpNE` `AryCmpLT` `AryCmpLE` `AryCmpGT` `AryCmpGE`
Array element comparison EQ	NJ only	—	`AryCmpEQV` `AryCmpNEV` `AryCmpLTV` `AryCmpLEV` `AryCmpGTV` `AryCmpGEV`

Timers

Name	Category	KEYENCE KV-X	OMRON NJ/NX
On-delay timer	★IEC	`TON`	`TON`
Off-delay timer	★IEC	`TOF`	`TOF`
Pulse output	★IEC	`TP`	`TP`
Up-down timer	KV only	`UpDownTimer`	—
Accumulation timer	NJ only	—	`AccumulationTimer`
100 ms timer	NJ only	—	`Timer`

Counters

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Up counter	★IEC	`CTU`	`CTU`
Up counter group	★IEC	`CTU_DINT` `CTU_UDINT`	`CTU_**`
Down counter	★IEC	`CTD`	`CTD`
Down counter group	★IEC	`CTD_DINT` `CTD_UDINT`	`CTD_**`
Up-down counter	★IEC	`CTUD`	`CTUD`
Up-down counter group	★IEC	`CTUD_DINT` `CTUD_UDINT`	`CTUD_**`

Shift and rotate

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Shift left N bits	★IEC	`SHL`	`SHL`
Shift right N bits	★IEC	`SHR`	`SHR`
Rotate left N bits	★IEC	`ROL`	`ROL`
Rotate right N bits	★IEC	`ROR`	`ROR`
Shift array left N elements	Similar	`AryShiftL`	`ArySHL`
Shift array right N elements	Similar	`AryShiftR`	`ArySHR`
Shift register	Similar	`ShiftRegister`	`AryShiftReg`
Left/right shift register	NJ only	—	`AryShiftRegLR`
N-bit data shift left N bits with carry	NJ only	—	`NSHLC` `NSHRC`

Logical operations

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Bit inversion	★IEC	`NOT`	`NOT`
Logical AND	★IEC	`AND`	`AND&`
Logical OR	★IEC	`OR`	`OR`
Exclusive OR	★IEC	`XOR`	`XOR`
Exclusive NOR	NJ only	—	`XORN`
Array logical AND	NJ only	—	`AryAnd` `AryOr` `AryXor` `AryXorN`

Arithmetic

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Addition	★IEC	`ADD`	`ADD+`
Addition (with overflow check)	NJ only	—	`AddOU+OU`
Subtraction	★IEC	`SUB`	`SUB-`
Subtraction (with overflow check)	NJ only	—	`SubOU-OU`
Multiplication	★IEC	`MUL`	`MUL*`
Multiplication (with overflow check)	NJ only	—	`MulOU*OU`
Division	★IEC	`DIV`	`DIV/`
Modulo	★IEC	`MOD`	`MOD`
Real modulo	NJ only	—	`ModReal`
Absolute value	★IEC	`ABS`	`ABS`
Square root	★IEC	`SQRT`	`SQRT`
Natural logarithm	★IEC	`LN`	`LN`
Common logarithm	★IEC	`LOG`	`LOG`
Natural exponential	★IEC	`EXP`	`EXP`
SIN	★IEC	`SIN`	`SIN`
COS	★IEC	`COS`	`COS`
TAN	★IEC	`TAN`	`TAN`
SIN-1	★IEC	`ASIN`	`ASIN`
COS-1	★IEC	`ACOS`	`ACOS`
TAN-1	★IEC	`ATAN`	`ATAN`
Exponentiation	★IEC	`EXPT`	`EXPT**`
Arc tangent from coordinates	KV only	`ATAN2`	—
Degrees → radians conversion	Similar	`DegToRad`	`DegToRad`
Radians → degrees conversion	Similar	`RadToDeg`	`RadToDeg`
Increment	Similar	`Inc`	`Inc`
Decrement	Similar	`Dec`	`Dec`
Sign inversion	NJ only	—	`Neg`
Extract fractional part of real	NJ only	—	`Fraction`
Random number generation	NJ only	—	`Rand`
Array batch addition	NJ only	—	`AryAdd` `AryAddV` `ArySub` `ArySubV`
Real number check	Similar	`IS_VALID`	`CheckReal`

Selection

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Bit selection	★IEC	`SEL`	`SEL`
Multiplexer	★IEC	`MUX`	`MUX`
Maximum value search	★IEC	`MAX`	`MAX`
Minimum value search	★IEC	`MIN`	`MIN`
Upper/lower limit	★IEC	`LIMIT`	`LIMIT`
Dead band control	NJ only	—	`Band`
Dead zone control	NJ only	—	`Zone`

Arrays and data processing

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Search array for maximum value	Similar	`AryMax`	`AryMax`
Search array for minimum value	Similar	`AryMin`	`AryMin`
Average of array elements	Similar	`AryMean`	`AryMean`
Sum calculation	KV only	`ArySum`	—
Standard deviation of array elements	NJ only	—	`ArySD`
Array search	Similar	`DataSearch`	`ArySearch`
Bit counter	Partial	`BitCount`	`BitCnt`
Initialization	Partial	`AryReset`	`Clear`
Record sort	Similar	`StructSort`	`RecSort`
Record search	NJ only	—	`RecSearch` `RecRangeSearch`
Get number of records	NJ only	—	`RecNum`
Record maximum value search	NJ only	—	`RecMax` `RecMin`
Sum calculation	Partial	`ByteSum`	`StringSum`
CRC-16 calculation (array)	Similar	`AryCRC`	`AryCRC16` `AryCRCCCITT`
CRC-16 calculation (string)	NJ only	—	`StringCRC16` `StringCRCCCITT`
LRC calculation (string)	NJ only	—	`StringLRC` `AryLRC_**`

Data transfer

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Transfer	★IEC	`MOVE`	`MOVE`
Block set	Similar	`FillMove`	`SetBlock`
Array transfer	Similar	`BlockMove`	`AryMove`
Memory copy	NJ only	—	`MemCopy`
Multiple bit set	Partial	`BitFillMove`	`SetBits`
Multiple bit transfer	Similar	`BitBlockMove`	`TransBits`
Digit transfer	Partial	`PartialMove`	`MoveDigit`
Bit transfer	NJ only	—	`MoveBit`
Convert to byte array	Partial	`ByteBlockMove`	`ToAryByte` `AryByteTo`
Data exchange	Similar	`Exchange`	`Exchange`
Array data exchange	NJ only	—	`AryExchange`
Initialization	Similar	`Clear`	`Clear`
Initialization	Partial	`StructReset`	`Clear`
Bit pattern copy (bit string → signed integer) group	NJ only	—	`CopyToNum` `CopyNumTo` `CopyTo*`

Get size

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Get number of array elements	Similar	`GetAryCount`	`SizeOfAry`
Get array start index	★IEC	`LOWER_BOUND`	`LOWER_BOUND`
Get array end index	★IEC	`UPPER_BOUND`	`UPPER_BOUND`
Get word size	KV only	`GetWordSize`	—
Get byte size	KV only	`GetByteSize`	—
Get bit size	KV only	`GetBitSize`	—

Data conversion

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Bit decoder	Similar	`Decode`	`Decoder`
Bit encoder	Similar	`Encode`	`Encoder`
BIN code → Gray code conversion group	Similar	`BinToGrayCode`	`BinToGray_**`
Gray code → BIN code conversion group	Similar	`GrayCodeToBin`	`GrayToBin_**`
Gray code conversion	NJ only	—	`Gray`
4-bit split	Similar	`DisperseNibble`	`DispartDigit`
4-bit combine group	Similar	`UniteNibble`	`UniteDigit_**`
Byte data split	Similar	`DisperseByte`	`Dispart8Bit`
Byte data combine group	Similar	`UniteByte`	`Unite8Bit_**`
2-byte combine	NJ only	—	`PackWord` `PackDword`
Byte swap	Partial	`BlockSwap`	`Swap`
Bit row → bit column conversion group	NJ only	—	`ColmToLine_**` `LineToColm`
Split real mantissa and exponent	NJ only	—	`DispartReal` `UniteReal`
Polyline approximation (with polyline check)	Similar	`ApproxCal`	`PWLApprox`
Polyline approximation (without polyline check)	NJ only	—	`PWLApproxNoLineChk` `PWLLineChk`
Moving average	NJ only	—	`MovingAverage`
Scaling	NJ only	—	`ScaleTrans`

Data control (PID etc.)

Name	Category	KEYENCE KV-X	OMRON NJ/NX
PID with autotuning	Similar	`PID`	`PIDAT`
Heating/cooling PID with autotuning	NJ only	—	`PIDAT_HeatCool`
Time-proportional output	Similar	`TimeProportionalOut`	`TimeProportionalOut`
Ramp signal	KV only	`Ramp`	—
Lead-lag filter	KV only	`LeadLagFilter`	—
Upper/lower limit alarm group	NJ only	—	`LimitAlarm_` `LimitAlarmDv_` `LimitAlarmDvStbySeq_**`
Step program	NJ only	—	`AC_StepProgram`

Tables and stacks

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Stack data store	Similar	`FIFOWrite`	`StackPush`
First in, first out	Similar	`FIFORead`	`StackFIFO`
Last in, first out	NJ only	—	`StackLIFO`
Stack data insert	Similar	`FIFOInsert`	`StackIns`
Stack data delete	Similar	`FIFODelete`	`StackDel`

Character conversion

Name	Category	KEYENCE KV-X	OMRON NJ/NX
BIN data → hexadecimal ASCII code conversion	KV only	`BinaryToAscii`	—
Hexadecimal ASCII code → BIN data conversion	KV only	`AsciiToBinary`	—
Hexadecimal ASCII code → string conversion	KV only	`AsciiToString`	—
Fixed-length decimal string conversion	Similar	`NumToDecString`	`NumToDecString`
String → integer conversion group	Similar	`DecStringToNum`	`STRING_TO_**`
Fixed-length hexadecimal string conversion	Similar	`NumToHexString`	`NumToHexString`
Hexadecimal string → number conversion group	Similar	`HexStringToNum`	`HexStringToNum_**`
Real (REAL) → string conversion with format	Similar	`RealToString`	`RealToFormatString`
Real (LREAL) → string conversion with format	Similar	`LrealToString`	`LrealToFormatString`
String → integer conversion group	Similar	`StringToReal`	`STRING_TO_**`
String → integer conversion group	Similar	`StringToLreal`	`STRING_TO_**`
Fixed-point number → string conversion	NJ only	—	`FixNumToString` `StringToFixNum`
Variable value → string conversion	KV only	`VariableToString`	—
String → variable value conversion	KV only	`StringToVariable`	—
CIP string → string conversion	KV only	`CipStringToString`	—
String → CIP string conversion	KV only	`StringToCipString`	—
UTF-16 data → string conversion	KV only	`UTF16CodeToString`	—
String → UTF-16 data conversion	KV only	`StringToUTF16Code`	—
Character code conversion (UTF-8 → SJIS)	NJ only	—	`UTF8ToSJIS` `SJISToUTF8`
String → array conversion	Similar	`DisperseString`	`StringToAry`
Array → string conversion	Similar	`UniteString`	`AryToString`
Date/time → string conversion	NJ only	—	`DtToString` `DateToString` `TodToString`
String MD5 conversion	NJ only	—	`StringMD5`

String processing

Name	Category	KEYENCE KV-X	OMRON NJ/NX	Remarks
String length detection	★IEC	`LEN`	`LEN`
String: extract from left	★IEC	`LEFT`	`LEFT`
String: extract from right	★IEC	`RIGHT`	`RIGHT`
String: extract from any position	★IEC	`MID`	`MID`
String: concatenate	★IEC	`CONCAT`	`CONCAT`
String: insert	★IEC	`INSERT`	`INSERT`
String: delete	★IEC	`DELETE`	`DELETE`
String: replace	★IEC	`REPLACE`	`REPLACE`
String: search	★IEC	`FIND`	`FIND`
String search within range	KV only	`StringSearch`	—
Transfer	Partial	`StringMove`	`MOVE`
String: trim left	Similar	`TrimL`	`TrimL`
String: trim right	Similar	`TrimR`	`TrimR`
String: trim both ends	KV only	`Trim`	—
Read string with delimiter removed	Partial	`SplitN`	`SubDelimiter`	KV: to string array / NJ: to structure
Write string with delimiter added	NJ only	—	`AddDelimiter`
String: convert to uppercase	NJ only	—	`ToUCase` `ToLCase`
String: clear	NJ only	—	`ClearString`
String: get byte count	NJ only	—	`GetByteLen`

Time and date/time

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Time addition	★IEC	`ADD_TIME`	`ADD_TIME`
Time subtraction	★IEC	`SUB_TIME`	`SUB_TIME`
Time multiplication	★IEC	`MUL_TIME`	`MULTIME`
Time division	★IEC	`DIV_TIME`	`DIVTIME`
Add time of day and duration	NJ only	—	`ADD_TOD_TIME` `ADD_DT_TIME`
Subtract duration from time of day	NJ only	—	`SUB_TOD_TIME` `SUB_TOD_TOD` `SUB_DATE_DATE` `SUB_DT_DT` `SUB_DT_TIME`
Combine date and time of day	NJ only	—	`CONCAT_DATE_TOD` `DT_TO_TOD` `DT_TO_DATE`
Clock correction	Similar	`WriteCalendarTime`	`SetTime`
Get time	NJ only	—	`GetTime`
Date/time → seconds conversion	Similar	`DtToSec`	`DtToSec`
Seconds → date/time conversion	Similar	`SecToDt`	`SecToDt`
Date → seconds conversion	NJ only	—	`DateToSec` `TodToSec` `SecToDate` `SecToTod`
Get day of week	Similar	`GetDayOfWeek`	`GetDayOfWeek`
Time → microseconds conversion	KV only	`TimeToMicroSec`	—
Time → milliseconds conversion	KV only	`TimeToMilliSec`	—
Time → seconds conversion	Similar	`TimeToSec`	`TimeToSec`
Time → nanoseconds conversion	NJ only	—	`TimeToNanoSec`
Microseconds → time conversion	KV only	`MicroSecToTime`	—
Milliseconds → time conversion	KV only	`MilliSecToTime`	—
Seconds → time conversion	Similar	`SecToTime`	`SecToTime`
Nanoseconds → time conversion	NJ only	—	`NanoSecToTime`
Leap year check	NJ only	—	`ChkLeapYear` `GetDaysOfMonth` `DaysToMonth` `GetWeekOfYear`
Split time	NJ only	—	`DtToDateStruct` `DateStructToDt`
Truncate time	NJ only	—	`TruncTime` `TruncDt` `TruncTod`

Data type conversion and BCD

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Integer → integer conversion group	★IEC	`_TO_*`	`_TO_*`
Integer conversion group	★IEC	`TO_**`	`TO_**`
Truncate real	★IEC	`TRUNC_**`	`TRUNC`
Round real	NJ only	—	`Round` `RoundUp`
Unsigned integer → BCD conversion group	★IEC	`TO_BCD_**`	`_TO_BCD_*`
BCD → unsigned integer conversion group	★IEC	`BCD_TO_**`	`_BCD_TO_` `BCD_TO_*`
Signed BCD → signed integer conversion	NJ only	—	`BCDsToBin` `BinToBCDs_**`
Array batch BCD conversion	NJ only	—	`AryToBCD` `AryToBin`
Integer → string conversion group	NJ only	—	`_TO_STRING` `STRING_TO_`
Enumeration → integer conversion	NJ only	—	`EnumToNum` `NumToEnum`
Range type variable check	NJ only	—	`ChkRange`

Files (storage / SD card)

Name	Category	KEYENCE KV-X	OMRON NJ/NX	Remarks
File write	Partial	`StorageWriteBin`	`FileWrite`	NJ: FileOpen, FileClose required (FileWriteVar for a single variable)
File read	Partial	`StorageReadBin`	`FileRead`	NJ: FileOpen, FileClose required (FileReadVar for a single variable)
Variable file write	NJ only	—	`FileWriteVar` `FileReadVar`
File open	NJ only	—	`FileOpen` `FileClose` `FileSeek`
String read	Similar	`StorageReadLine`	`FileGets`	KV: multiple lines / NJ: 1 line
String write	Similar	`StoragePrint`	`FilePuts`
File delete	Similar	`StorageDeleteFile`	`FileRemove`
Create directory	Similar	`StorageMakeDir`	`DirCreate`
Delete directory	Similar	`StorageRemoveDir`	`DirRemove`
File copy	Similar	`StorageCopy`	`FileCopy`
Move storage file	KV only	`StorageMove`	—
File rename	Similar	`StorageRename`	`FileRename`
Get free storage space	KV only	`StorageGetCapacity`	—	NJ:_Card1Capacity/_Card1Used
Get storage file status	KV only	`StorageGetStatus`	—
Get storage file list	KV only	`StorageGetFileList`	—
SD Memory Card backup	NJ only	—	`BackupToMemoryCard`

Socket communication

Name	Category	KEYENCE KV-X	OMRON NJ/NX
TCP socket connect	Similar	`SocketTCP_ActiveOpen`	`SktTCPConnect`
TCP socket accept	Similar	`SocketTCP_PassiveOpen`	`SktTCPAccept`
TCP socket send	Similar	`SocketTCP_Send`	`SktTCPSend`
TCP socket receive	Similar	`SocketTCP_Recv`	`SktTCPRcv`
TCP socket receive (with delimiter)	KV only	`SocketTCP_RecvDelimiter`	—
UDP socket create	Similar	`SocketUDP_Open`	`SktUDPCreate`
UDP socket send	Similar	`SocketUDP_Send`	`SktUDPSend`
UDP socket receive	Similar	`SocketUDP_Recv`	`SktUDPRcv`
TCP/UDP socket receive buffer clear	Similar	`SocketClearRecvBuf`	`SktClearBuf`
TCP/UDP socket close	Similar	`SocketClose`	`SktClose`
Read TCP socket status	NJ only	—	`SktGetTCPStatus`
Set TCP socket option	NJ only	—	`SktSetOption`
Establish TLS session	NJ only	—	`SktTLSConnect` `SktTLSRead` `SktTLSWrite` `SktTLSDisconnect` `SktTLSClearBuf` `SktTLSStopLog`
Send PING	KV only	`Ping`	—
Send Modbus TCP general command	NJ only	—	`ModbusTCPCmd` `ModbusTCPRead` `ModbusTCPWrite`
Get FTP server file list	NJ only	—	`FTPGetFileList` `FTPGetFile` `FTPPutFile` `FTPRemoveFile` `FTPRemoveDir`
Change IP address	NJ only	—	`ChangeIPAdr` `ChangeXBUnitIPAdr` `ChangeFTPAccount` `ChangeNTPServerAdr`
Read NTP status	NJ only	—	`GetNTPStatus`

EtherNet/IP (CIP messages)

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Send explicit message (UCMM)	Similar	`CipMsgService`	`CIPUCMMSend` `CIPSend`
Send explicit message (UCMM)	Partial	`CipGetAttributeSingle`	`CIPUCMMSend`
Send explicit message (UCMM)	Partial	`CipSetAttributeSingle`	`CIPUCMMSend`
Read variable (UCMM explicit message)	NJ only	—	`CIPUCMMRead` `CIPUCMMWrite`
Establish CIP Class 3 (Large_Forward_Open) connection	NJ only	—	`CIPOpen` `CIPOpenWithDataSize` `CIPRead` `CIPWrite` `CIPClose`

EtherCAT

Name	Category	KEYENCE KV-X	OMRON NJ/NX
CoE SDO read	Similar	`EC_CoE_SDORead`	`EC_CoESDORead`
CoE SDO write	Similar	`EC_CoE_SDOWrite`	`EC_CoESDOWrite`
Disconnect EtherCAT slave	Partial	`EC_CoE_PDOStop`	`EC_DisconnectSlave`
Reconnect EtherCAT slave	Partial	`EC_CoE_PDORestart`	`EC_ConnectSlave`
Enable / disable EtherCAT slave	NJ only	—	`EC_ChangeEnableSetting`
Start EtherCAT packet monitor	NJ only	—	`EC_StartMon` `EC_StopMon` `EC_SaveMon` `EC_CopyMon`
Read EtherCAT master diagnostic and statistical information	NJ only	—	`EC_GetMasterStatistics` `EC_ClearMasterStatistics` `EC_GetSlaveStatistics` `EC_ClearSlaveStatistics`
Write NX object	NJ only	—	`NX_WriteObj` `NX_ReadObj`

OPC UA

Name	Category	KEYENCE KV-X	OMRON NJ/NX
OPC UA client connect	KV only	`UA_Connect`	—
OPC UA client disconnect	KV only	`UA_Disconnect`	—
Get node handle list	KV only	`UA_NodeGetHandleList`	—
Release node handle list	KV only	`UA_NodeReleaseHandleList`	—
Read node value	KV only	`UA_ReadValueList`	—
Write node value	KV only	`UA_WriteValueList`	—
Enable server method	KV only	`UA_ServerMethodEnable`	—
Complete server method	KV only	`UA_ServerMethodComplete`	—
UINT array → OPC UA date/time conversion	KV only	`UA_UINTarrayToDateTime`	—
OPC UA date/time → UINT array conversion	KV only	`UA_DateTimeToUINTarray`	—

Units, buffer memory and refresh

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Read buffer memory value	KV only	`UnitBufMemRead` `UnitBufMemBlockRead`	—
Write buffer memory value	KV only	`UnitBufMemWrite` `UnitBufMemBlockWrite` `UnitBufMemFill`	—
Refresh input relay status	KV only	`RefreshX` `RefreshY`	—
Refresh cyclic communication input data	KV only	`RefreshCyclicInput` `RefreshCyclicOutput`	—
Free-running counter refresh	KV only	`RefreshFreerunCounter`	—
Get incrementing free-running counter group	NJ only	—	`Get**Cnt`
Get clock pulse group	NJ only	—	`Get**Clk`
Determine unit type	KV only	`IS_***`	—
Restart unit	NJ only	—	`ResetUnit` `RestartNXUnit`
Change NX Unit write mode	NJ only	—	`NX_ChangeWriteMode` `NX_SaveParam`
Read PLC total power-on time	NJ only	—	`PLC_ReadTotalPowerOnTime` `NX_ReadTotalPowerOnTime` `XBUnit_ReadTotalPowerOnTime`

Program and task control

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Program execute command	Similar	`ModuleStart`	`PrgStart`
Program stop command	Similar	`ModuleStop`	`PrgStop`
Read program status	NJ only	—	`PrgStatus`
Read own task status	NJ only	—	`GetMyTaskStatus` `GetMyTaskInterval` `Task_IsActive`
Activate event task	NJ only	—	`ActEventTask`
Exclusive lock between tasks	NJ only	—	`Lock` `Unlock`
Get program hash code	NJ only	—	`GetPrgHashCode`

Interrupts

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Enable interrupts	KV only	`EnableInterrupt`	—
Disable interrupts	KV only	`DisableInterrupt`	—
Interrupt-disabled range	KV only	`DisableInterruptRange`	—
Set input interrupt detection condition	KV only	`SetInputInterruptCondition`	—

Logging, tracing and operation recording

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Data trace sampling	Partial	—	`TraceSamp`
Data trace trigger condition met	NJ only	—	`TraceTrig`
Read data trace status	NJ only	—	`GetTraceStatus`
Switch collection settings	Partial	—	`APB_ChangeSamplingSettings`
Enable logging/trace	KV only	`LoggingEnable` `LoggingDisable`	—
Get operation recording data	Partial	`OperationRecordCapture` `OperationRecordSave`	—
Save camera image	KV only	`CameraSaveImage`	—

Errors and events

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Create user-defined error	NJ only	—	`SetAlarm` `ResetAlarm` `GetAlarm`
Create user-defined information	NJ only	—	`SetInfo`
Get PLC error status	NJ only	—	`GetPLCError` `ResetPLCError`
Get I/O bus error status	NJ only	—	`GetCJBError` `ResetCJBError`
Get NX bus error status	NJ only	—	`GetNXBError` `ResetNXBError` `GetNXUnitError`
Get X bus error status	NJ only	—	`GetXBError` `GetXBUnitError` `ResetXBUnitError`
Get EtherCAT error status	NJ only	—	`GetECError` `ResetECError`
Get EtherNet/IP error status	NJ only	—	`GetEIPError`
Get motion control error status	NJ only	—	`GetMCError` `ResetMCError`

Variable access and device addresses

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Get device address	KV only	`DevAddressGet`	—
Increment device address	KV only	`DevAddressInc` `DevAddressDec` `DevAddressAdd` `DevAddressSub`	—
Get device information	KV only	`DevInfoGet`	—
Read bit string from device information	KV only	`DevInfoRead` `DevInfoOffsetRead`	—
Write bit string from device information	KV only	`DevInfoWrite` `DevInfoOffsetWrite`	—

Serial communication

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Protocol macro	NJ only	—	`ExecPMCR` `SerialSend` `SerialRcv` `SerialRcvNoClear` `SendCmd`
Send no-protocol data	NJ only	—	`NX_SerialSend` `NX_SerialRcv` `NX_SerialSigCtl` `NX_SerialSigRead` `NX_SerialStatusRead` `NX_SerialBufClear` `NX_SerialStartMon` `NX_SerialStopMon`
Send Modbus RTU general command	NJ only	—	`NX_ModbusRtuCmd` `NX_ModbusRtuRead` `NX_ModbusRtuWrite`

IO-Link and time stamps

Name	Category	KEYENCE KV-X	OMRON NJ/NX	Remarks
Read IO-Link device object	NJ only	—	`IOL_ReadObj` `IOL_WriteObj`
Write time-stamped digital output	NJ only	—	`NX_DOutTimeStamp` `NX_AryDOutTimeStamp`

Unit programs

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Start unit program	KV only	`UPStart`	—
Force-end unit program	KV only	`UPStop`	—
Pause flow	KV only	`UFSuspend` `UFResume`	—

Compatibility (older KV models)

Name	Category	KEYENCE KV-X	OMRON NJ/NX
String: extract from any position	Partial	`C_SMID`	`MID`
String: insert	Partial	`C_SINS`	`INSERT`
String: delete	Partial	`C_SDEL`	`DELETE`
String comparison EQ	Partial	`C_SCMP`	`EQascii`

Unit-specific (KV only)

Name	Category	KEYENCE KV-X	OMRON NJ/NX
Read buffered data	KV only	`U_ReadBuf`	—
Set output overcurrent protection	KV only	`U_DisableOverCP`	—
Set input overvoltage protection	KV only	`U_DisableOverVP`	—
KV socket open settings	KV only	`U_SockOpen`	—
Write KV socket send data	KV only	`U_SockWriteBuf`	—
Read KV socket receive data	KV only	`U_SockReadBuf`	—
Read KV socket processing status	KV only	`U_SockStatus`	—
KV socket TCP (no-protocol) receive settings	KV only	`U_SockNonProcRecvSetting`	—
Write KV socket UDP destination	KV only	`U_SockUDPTo`	—
Specify KV socket Ethernet port number	KV only	`U_SockSelectPort`	—
Set mail recipient group	KV only	`U_MailToGroup`	—
Set mail recipient address	KV only	`U_MailTo`	—
Set mail subject	KV only	`U_MailSubject`	—
Set mail body	KV only	`U_MailText`	—
Set mail attachment file name	KV only	`U_MailAttach`	—
Get mail send result	KV only	`U_MailStatus`	—
Read FTP file transfer status	KV only	`U_FTPClientStatus`	—
Specify message communication target	KV only	`U_MsgTo`	—
Write message communication send data	KV only	`U_MsgSend`	—
Read message communication receive data	KV only	`U_MsgRecv`	—
Read message communication completion code	KV only	`U_MsgStatus`	—
Specify node for cyclic communication stop request	KV only	`U_CyclicStop`	—
Specify node for cyclic communication resume request	KV only	`U_CyclicStart`	—
Read cyclic communication registered node table	KV only	`U_CyclicReadRegister`	—
Read cyclic communication error node table	KV only	`U_CyclicReadErr`	—
Read PROTOCOL STUDIO event communication command receive buffer	KV only	`U_PSReadBuf`	—
Read current count value	KV only	`U_CntReadCounter`	—
Read frequency	KV only	`U_CntReadHz`	—
Read rotation speed	KV only	`U_CntReadRPM`	—
Read input capture 0	KV only	`U_CntReadInputCapture0`	—
Read input capture 1	KV only	`U_CntReadInputCapture1`	—
Write current count value	KV only	`U_CntWriteCounter`	—
Write comparator setting 0	KV only	`U_CntWriteCTC0`	—
Write comparator setting 1	KV only	`U_CntWriteCTC1`	—
Write preset value	KV only	`U_CntWritePreset`	—
Read A/D conversion special data	KV only	`U_ADRead`	—
Read all A/D conversion data	KV only	`U_ADReadBlock`	—
Change special data offset	KV only	`U_ADWriteOffset`	—
Write averaging constant	KV only	`U_ADWriteAverage`	—
Write scaling settings	KV only	`U_ADWriteScaling`	—
Write comparator setting	KV only	`U_ADWriteCmpLimit`	—
Change D/A conversion output data	KV only	`U_DAWrite`	—
Change output data offset	KV only	`U_DAWriteOffset`	—
Write scaling settings	KV only	`U_DAWriteScaling`	—
Write upper/lower limit alarm values	KV only	`U_DAWriteUpperLowerLimit`	—
Write positioning start point number	KV only	`U_PosWritePointNo`	—
Read current positioning point number	KV only	`U_PosReadCurrentPointNo`	—
Read positioning M code number	KV only	`U_PosReadMCode`	—
Read current coordinates	KV only	`U_PosReadActPos`	—
Read current speed	KV only	`U_PosReadActVel`	—
Read feedback torque monitor	KV only	`U_PosReadFeedbackTrq`	—
Read command coordinates	KV only	`U_PosReadCmdPos`	—
Read command speed	KV only	`U_PosReadCmdVel`	—
Write current coordinate change	KV only	`U_PosWriteChgPos`	—
Write positioning target coordinate change (coordinate)	KV only	`U_PosWriteChgTargetPos`	—
Write positioning target coordinate change (speed)	KV only	`U_PosWriteChgTargetVel`	—
Write positioning speed change	KV only	`U_PosWriteChgVel`	—
Write positioning speed override	KV only	`U_PosWriteOverride`	—
Read current control mode	KV only	`U_PosReadCtrlMode`	—
Write control mode change	KV only	`U_PosWriteCtrlMode`	—
Write speed command for speed control	KV only	`U_PosWriteVelCtrlCmdVel`	—
Write torque limit for speed control	KV only	`U_PosWriteVelCtrlTrqLimit`	—
Write torque command for torque control	KV only	`U_PosWriteTrqCtrlCmdTrq`	—
Write speed limit for torque control	KV only	`U_PosWriteTrqCtrlVelLimit`	—
Read axis error code	KV only	`U_PosReadAxisErrCode`	—
Write special function selection	KV only	`U_PosWriteSelectSpecialFunc`	—

No matching instructions found.

Legend

★IEC	IEC 61131-3 standard functions/FBs. Can generally be used with the same arguments on both KV-X and NJ/NX (differences such as the maximum number of inputs are given in the remarks)
Similar	Proprietary instructions of each manufacturer with equivalent functions. Argument names, types and structure differ
Partial	Functions that partly overlap, or can be substituted by a combination of instructions
KV only / NJ only	Instructions available on only one of the models (within the scope of this page)
—	No corresponding instruction
Name	Name as given in the NJ/NX Instructions Reference Manual (KV-X name if there is no NJ/NX equivalent)
○○_ ／ _TO_***	Group instructions whose names change by data type (e.g. CTU_** → CTU_DINT, CTU_LINT, etc.)

How rows are organized

Each function is one row. Instructions of the same family (read/write, start/stop, etc.) are listed on the same row separated by " / ".
Breakdown by category: ★IEC 70, similar 78, partial 24, KV only 125, NJ only 117 (414 rows in total).

Scope

KV-X: covers chapter 3 "FUN/FB" of the Instruction Reference Manual. Motion control instructions (MC_...), the instructions in chapter 2 (ladder instructions) and ST syntax are excluded.
NJ/NX: covers the Instructions Reference Manual, Basic. Ladder diagram instructions (LD/AND/OR/Out), ST statements (IF/CASE etc.), sequence control instructions (MC/JMP/FOR etc.) and the instructions in the Motion Control volume are excluded.
KV-X has no bit string types such as BYTE/WORD/DWORD/LWORD and handles them as integer types. NJ/NX bit operation and shift instructions apply to bit string types.
Instruction specifications and availability vary by CPU model and version. Check each manufacturer's manual before actual use.

Sources

KEYENCE: KV-X500/X300 Series Instruction Reference Manual 084A06 (March 2026)
OMRON: NJ/NX-series Instructions Reference Manual, Basic, SBCA-468Y (October 2025)