05 Data processing

BCC/BIN16 and BIN8 bit data addition, subtraction and exclusive check

BCC (P)

Specify the calculation method of BCC in (S1), specify the destination start address in (S2), and specify the destination data length in (S3), and then store the operation result in the device specified in (D).

- [BCC (S1) (S2) (S3) (D)]

Content, range and data type

Device used

Features

According to the calculation method specified by S1, starting from the 16-bit data specified by S2, calculate the ASCII block check code (BCC) of the number of bytes specified by S3, and then store the result of BCC code in the low byte of 16-bit data specified by D.

S1: Specify the calculation method of BCC.

K0: Addition operation

K1: Subtraction operation

K2: Exclusive or operation

S2 and s3: Specify the destination data

For example, if the destination is the 12 bytes data starting from D0, the settings are as below.

S2: D0

S3: K12 (specify the data by decimal)

The modes used in the calculation of this instruction are 16-bit conversion mode and 8-bit conversion mode. For the actions of each mode, refer to the followings.

(1) 16-bit conversion mode (When SM161 is OFF)

Calculate the high 8-bit (byte) and low 8-bit (byte) of device that started from (S2) and specify the byte length by (S3), and store the low 8-bit of device specified by (D). The conversion result is as below.

(2) 8-bit conversion mode (When SM161 is ON)

Calculate the low 8-bit (byte) of device that started from (S2) and specify the byte length by (S3), and store the low 8-bit of device specified by (D). The conversion result is as below.

Error code

Example

When the trigger M0 is ON, calculate the a block check code (BCC) of 12-bit bytes of ASCII data starting from data register D0 by “exclusive or operation”. The block check code (BCC) is stored in the low bit byte of data register D6.

Application example

In the example ,calculate the BCC code and send as information after adding to the string “%01→RC”.

The data transmission is carried out in the form of ASCII codes.

CC calculations use logical exclusive OR, addition, and subtraction.

The information is stored as follows:

D6: BCC check code

D2 to D0: 6 byte

BCC instruction is as below:

S1(K2): logic exclusive OR

S2(D0): The start of destination data

S3(K6): destination data lengt

D(D6): calculation result

Execution or operation

After the execution BCC code is stored in the last byte of D6.

How to calculate block check code (BCC)

Calculate block check code (BCD) with XOR for each ASCII code.

BCC code

MAX/BIN16 bit the maximum value of 16-bit data

MAX (P)

Specify the destination start address in (S1), and specify the destination end address in (S2), and then store the operation result in the device specified in (D).

- [MAX (S1) (S2) (D)]

Content, range and data type

Device used

Error code

Features

Use the BIN16 bit data specified in (S1) as the start address, and use the BIN16 bit data specified in (S2) as the end address to get the maximum value between the device of (S1) and (S2).

Example

Use (D1) as the start address, and use (D5) as the end address to get the max value between them and store the result in (D6). As the figure above, the max value between (D1) and (D5) is the value in (D3) which is stored in (D6) for output.

DMAX/BIN32 bit the maximum value of 32-bit data

DMAX (P)

Specify the destination start address in (S1), and specify the destination end address in (S2), and then store the operation result in the device specified in (D).

- [DMAX (S1) (S2) (D)]

Content, range and data type

Device used

Features

Use the BIN32 bit data specified in (S1) as the start address, and use the BIN32 bit data specified in (S2) as the end address to get the maximum value between the device of (S1) and (S2).

✎Note

1. The devices specified by (S1) and (S2) should be the same type. The type of device (D) that gets the results could be different.

2. The device size specified by (S1) can’t exceed the device size specified by (S2). For example, DMAX D1 D5 D10 works, but DMAX D5 D1 D10 doesn't.

Error code

Example

MIN/BIN16 bit the minimum value of 16-bit data

MIN (P)

Specify the destination start address in (S1), and specify the destination end address in (S2), and then store the operation result in the device specified in (D).

- [MIN (S1) (S2) (D)]

Content, range and data type

Device used

Features

Use the BIN16 bit data specified in (S1) as the start address, and use the BIN16 bit data specified in (S2) as the end address to get the maximum value between the device of (S1) and (S2).

✎Note

1. The devices specified by (S1) and (S2) should be the same type. The type of device (D) that gets the results could be different.

2. The device size specified by (S1) can’t exceed the device size specified by (S2). For example, MAX D1 D5 D10 works, but MAX D5 D1 D10 doesn't.

Error code

Example

DMIN/BIN32 bit the minimum value of 32-bit data

DMIN (P)

Specify the destination start address in (S1), and specify the destination end address in (S2), and then store the operation result in the device specified in (D).

- [DMIN (S1) (S2) (D)]

Content, range and data type

Device used

Features

Use the BIN32 bit data specified in (S1) as the start address, and use the BIN32 bit data specified in (S2) as the end address to get the maximum value between the device of (S1) and (S2).

✎Note

1. The devices specified by (S1) and (S2) should be the same type. The type of device (D) that gets the results could be different.

2. The device size specified by (S1) can’t exceed the device size specified by (S2). For example, MAX D1 D5 D10 works, but MAX D5 D1 D10 doesn't.

Error code

Example

ANS/alarm settings

ANS(P)

Used to set alarm instructions.

-[ANS (S) (N) (D)]

Content, range and data type

Device used

Features

When the instruction input continues to be ON for the judgment time [(N)×100ms, timer (S)], set (D). If the instruction time turns off below the judgment time [(N)×100ms], the current value of the judgment timer (S) is reset, and (D) is not set. In addition, if the instruction input turns off, the judgment timer will be reset.

1. Judge the time ((N)X 100ms or less)

2. Judgment time or more (inclusive) ((N) X 100ms or more (inclusive))

Related device

Error code

Example

The fault number is displayed by the signal alarm.

ANR/Alarm reset

ANR(P)

The instruction to reset the small number that is ON in the alarm.

-[ANR]

Content, range and data type

Device used

Features

If the instruction input is ON, reset the active alarm in the alarm.

If multiple alarms are operating, reset the smaller number. If the input instruction is turned ON again, the next small number in the alarm that is operating will be reset.

Related device

✎Note: 

If you use the ANR instruction, reset in sequence every cycle.

If the ANRP instruction is used, it will be executed in only one operation cycle.

Error code

No operation error.

Example

The fault number is displayed by the signal alarm.

As shown below, when you write a program for diagnosing external faults, such as monitoring the content of SM249 (the smallest number in the ON state), the smallest number in the ON state among S900 to S999 will be displayed. When multiple faults occur at the same time, the next fault number can be obtained after eliminating the fault with the smallest number.

BON/16-bit data bit judgment

BON(P)

Check whether the state of the BIN 16-bit data (N) bit of the device specified in (S) is ON or OFF, and output the result to the device specified in (D).

-[BON (S) (N) (D)]

Content, range and data type

Device used

Features

Check whether the state of the BIN 16-bit data (N) bit of the device specified in (S) is ON or OFF, and output the result to the device specified in (D).

If the above result is ON, then (D)=ON, if it is OFF, then (D)=OFF.

If a constant (K) is specified in the device specified in (S), it will be automatically converted to BIN.

Error code

Example

When n in D0 = the third bit is 1 (ON), M0 is set to 1 (ON).

DBON/32-bit data bit judgment

DBON(P)

Check whether the state of the BIN 32-bit data (N) bit of the device specified in (S) is ON or OFF, and output the result to the device specified in (D).

-[DBON (S) (N) (D)]

Content, range and data type

Device used

Features

Check whether the BIN 32-bit data (N) bit status of the device specified in (S) is ON or OFF, and output the result to the device specified in (D).

If the above result is ON, then (D)=ON, if it is OFF, then (D)=OFF.

If a constant (K) is specified in the device specified in (S), it will be automatically converted to BIN.

Error code

Example

When n in D0 = the third bit is 1 (ON), M0 is set to 1 (ON).

ENCO/Encode

ENCO(P)

Encode the data of the 2th (N)th power from (S) and store it in (D).

-[ENCO (S) (N) (D)]

Content, range and data type

Device used

Features

The BIN value corresponding to the bit from 2 ^(N) bits of (S) to 1 is stored in (D).

When (N)=0, it will be no processing, and the content of the device specified in (D) will not change.

Bit devices are treated as 1 bit, and word devices are treated as 16 bits.

When multiple digits are 1, it will be processed at the upper position.

Error code

Example

When M20 is turned ON, the D0 device is 16 after encoding.

DECO/Decode

DECO(P)

Decode the lower (N) bits of the device specified in (S), and store the result in the 2 (N)th power of the device specified in (D).

-[DECO (S) (N) (D)]

Content, range and data type

Device used

Features

Turn ON the position of (D) corresponding to the BIN value specified in the lower (N) bit of (S).

When (N)=0, it will be no processing, and the content of the device specified in (D) will not change.

Bit devices are treated as 1 bit, and word devices are treated as 16 bits.

Error code

Example

When M20 is ON, M3 will be turned ON.

SUM/The ON bits of 16-bit data

SUM(P)

Store the total number of bits at 1 in the BIN 16-bit data of the device specified in (S) to the device specified in (D).

-[SUM (S) (D)]

Content, range and data type

Device used

Features

Store the total number of bits at 1 in the BIN 16-bit data of the device specified in (S) to the device specified in (D).

When the BIN 16-bit data of the device specified in (S) is all 0, the zero flag (SM153) turns on.

Error code

Example

When M0 is ON, the number of ON bits in D0 is counted and stored in D1. The value after D1 is executed is 4.

DSUM/The ON bits of 32-bit data

DSUM(P)

Store the total number of bits at 1 in the BIN 32-bit data of the device specified in (S) to the device specified in (D).

-[SUM (S) (D)]

Content, range and data type

Device used

Features

Store the total number of bits at 1 in the BIN 32-bit data of the device specified in (S) to the device specified in (D).

When the BIN 32-bit data of the device specified in (S) is all 0 (OFF), the zero flag (SM153) turns on.

✎Note:  When the instruction input is OFF, the instruction will not be executed, and the output of the ON digits of the action will remain the same as before.

Error code

Example

When M0 is ON, the number of ON bits in D0 is counted and stored in D10, and the value after D10 is executed is 4.

MEAN/Mean value of 16-bit data

MEAN(P)

The average value of the (n) point (16-bit) at the beginning of the soft component specified in (s) is calculated and the result is stored in (d).

-[MEAN (S) (D) (N)]

Content, range and data type

Device used

Features

Calculate the average value of the 16-bit data at (N) points starting from the device specified in (S) and store it in the device specified in (D).

The total is calculated from the algebraic sum and divided by (N).

The remainder is rounded off.

Error code

Example

Add the data of D0, D1, and D2 and save the value obtained after dividing by 3 in D10. The calculated average value is 6.

DMEAN/Mean value of 16-bit data

DMEAN(P)

The average value of the (n) point (32-bit) at the beginning of the soft component specified in (s) is calculated and the result is stored in (d).

-[DMEAN (S) (D) (N)]

Content, range and data type

Device used

Features

Calculate the mean value of BIN 32-bit data at (N) points starting from the device specified in (S) and store it in the device specified in (D).

The total is calculated from the algebraic sum and divided by (N).

The remainder is rounded off.

✎Note:  When the device number exceeds, (N) is handled as a smaller value within the allowable range.

Error code

Example

Add the data of D0, D2, and D4, and save the value obtained after dividing by 3 in D10 and D11, and the calculated average value is 6.

SQR/16-bit square root

SQR(P)

Calculate the square root of the BIN 16-bit data specified in (S), and store the calculation result in (D).

-[SQR (S) (D)]

Content, range and data type

Device used

Features

Calculate the square root of the BIN 16-bit data specified in (S), and store the calculation result in (D).

✎Note:  The decimal point of operation result will be rounded off and become an integer. If rounding occurs, SM152 (borrow flag) turns ON.

When the operation result is really 0, SM153 (zero flag) turns ON.

Error code

Example

The square root of D0 is stored in D2, and the value of D0 is 100, so the value of D2 is 10.

DSQR/32-bit square root

DSQR(P)

Calculate the square root of the BIN 32-bit data specified in (S), and store the calculation result in (D).

-[DSQR (S) (D)]

Content, range and data type

Device used

Features

Calculate the square root of the BIN 32-bit data specified in (S) and store the calculation result in (D).

✎Note: The decimal point of operation result will be rounded off and become an integer. If rounding occurs, SM152 (borrow flag) turns ON.

When the operation result is really 0, SM153 (zero flag) turns on.

Error code

Example

The square root of D0 is stored in D2, and the value of D0 is 110, so the value in the D2 soft component is 10 (the fractional part is discarded), and the borrow flag SM152 is turned ON.

WSUM/The sum value of 16-bit data

WSUM(P)

After adding all the BIN 16-bit data of point (n) starting from the device specified in (S), it is stored in the device specified in (D).

-[WSUM (S) (D) (N)]

Content, range and data type

Device used

Features

After adding all the BIN 16-bit data of point (N) starting from the device specified in (S), it is stored in the device specified in (D).

Error code

Example

When M0=ON, the total of 16-bit data of D0 to D2 is saved in [D100, D101], and the accounting result is 18.

DWSUM/The sum value of 32-bit data

DWSUM(P)

Add all the 32-bit BIN data of point (N) starting from the device specified in (S) and store it in the device specified in (D).

-[DWSUM (S) (D) (N)]

Content, range and data type

Device used

Features

Add all the 32-bit BIN data of point (n) starting from the device specified in (s) and store it in the device specified in (d).

✎Note: When the number of bits is specified in (D), the value of n ranges from 1 to 8, such as K8 (32-bit instructions, such as K8M0) without K16 (64-bit instructions).

Error code

Example

When M0=ON, the total of 16-bit data of D0 to D2 is saved in [D100, D101], and the accounting result is 18.

SORT/16-bit data sorting

SORT

Sort the data rows in ascending order based on the group data of column (N3) in the BIN 16-bit data table (sorting source) of (N1×N2) points specified in (S) and store them in the specified in (D) (N1×N2) points in the BIN 16-bit data table (after sorting).

-[SORT (S) (N1) (N2) (D) (N3)]

Content, range and data type

Device used

Features

The BIN 16-bit data table (sorting source) of (N1×N2) points specified in (S), based on the group data of column (N3), sort the data rows in ascending order, and store them in (D). The (N1×N2) point of the BIN 16-bit data table (after sorting).

Take (N1)=K3, (N2)=K4 in the sort source as an example, the data table structure is as follows. In the case of a sorted data table, (S) should be replaced with (D).

Data alignment starts when instruction input is ON, data alignment ends after (N1) scan, instruction execution end flag SM229 is set to ON. According to the source data sorted as follows, an example of the operation is shown below. In addition, by putting serial numbers such as management numbers in the first column in advance, the original row number can be judged based on the content, which is very convenient.

Press (N3)=K2 (column number 2) to execute the sorting result.

Press (N3)=K3 (column number 3) to execute the sorting result.

✎Note: only ascending order is supported by SORT instruction .

Do not change the operand and data content during operation.

When executing again, the instruction input should be turned OFF once.

SORT instruction can drive at most one in the program.

When the same device is specified in (S) and (D), the source data is rewritten to the sorted data order. Please pay special attention not to change the content of (S) before the end of execution.

Error code

Example

Refer to the function description example.

SORT2/16-bit data sorting

SORT2(P)

Sort the data rows in ascending or descending order based on the group data in column (N3), and store them in (D), based on the BIN 16-bit data table (sorting source) of (N1×N2) points specified in (S) In the BIN 16-bit data table (after sorting) of the specified (N1×N2) points.

-[SORT2 (S) (N1) (N2) (D) (N3)]

Content, range and data type

Device used

Features

Sort the data rows in ascending or descending order based on the group data in column (N3) and store them in (D) (N1×N2) point specified in the BIN 16-bit data table (after sorting).

Take (N1)=K3, (N2)=K4 in the sort source as an example, the data table structure is as follows. In the case of a sorted data table, (S) should be replaced with (D).

Sequence is set by the ON/OFF status of SM165

Data alignment starts when instruction input is ON, data alignment ends after (N1) scan, instruction execution end flag SM229 is set to ON.

According to the source data sorted as follows, an example of the operation is shown below. In addition, by putting serial numbers such as management numbers in the first column in advance, the original row number can be judged based on the content, which is very convenient.

Press (N3)=K2 (column number 2) to execute the sorting result (SM165=OFF in the case of ascending order)

Press (N3)=K3 (column number 3) to execute the sorting result (SM165=ON in the case of ascending order)

✎Note:  Do not change the operand and data content during operation.

When executing again, the instruction input should be turned OFF once.

The SORT2 instruction can only be written in the program to drive 2 at most.

When the same device is specified in (S) and (D), the source data is rewritten to the sorted data order. Please pay special attention not to change the content of (S) before the end of execution.

Do not overlap the source data and the sorted data.

Error code

Example

Refer to the function description example.

DSORT2/32-bit data sorting

DSORT2(P)

Sort the data rows in ascending or descending order based on the group data of column (N3) in the BIN 32-bit data table (sorting source) of (N1×N2) points specified in (S) and store them in (D) The specified (N1×N2) point BIN 32-bit data table (after sorting).

-[DSORT2 (S) (N1) (N2) (D) (N3)]

Content, range and data type

Device used

Features

Sort the data rows in ascending or descending order based on the group data in the (N3) column of the (N1×N2) point BIN 32-bit data table (sorting source) specified in (S), and store to (d) (N1×N2) specified in the BIN 32-bit data table (after sorting).

Take (N1)=K3, (N2)=K4 in the sort source as an example, the data table structure is as follows. In the case of a sorted data table, (S) should be replaced with (D).

Sequence is set by the ON/OFF status of SM165

Data alignment starts when instruction input is ON, data alignment ends after (n1) scan, instruction execution end flag SM229 is set to ON.

According to the source data sorted as follows, an example of the operation is shown below. In addition, by putting serial numbers such as management numbers in the first column in advance, the original row number can be judged based on the content, which is very convenient.

Press (N3)=K2 (column NO.2) to execute the sorting result (SM165=OFF in the case of ascending order)

Press (N3)=K3 (column NO.3) to execute the sorting result (SM165=ON in the case of ascending order)

✎Note:  Do not change the operand and data content during operation.

When executing again, the instruction input should be turned OFF once.

The SORT2 instruction can only be written twice in the program.

When the same device is specified in (S) and (D), the source data is rewritten to the sorted data order. Please pay special attention not to change the content of (S) before the end of execution.

Do not overlap the source data and the sorted data.

Error code

Example

Refer to the function description example.

SWAP/16-bit data high and low byte swap

SWAP(P)

Swap the high and low 8-bit value of the device specified in (D).

-[SWAP (D)]

Content, range and data type

Device used

Features

Convert the high and low 8-bit value of the device specified in (D).

Error code

Example

When the rising edge of M0 is triggered, swap the low 8 bits and high 8 bits of D0 to get H8F2A.

DSWAP/32-bit data high and low byte swap

DSWAP(P)

The devices specified in (D) and (D)+1 will be converted to the high and low 8-bit values respectively.

-[DSWAP (D)]

Content, range and data type

Device used

Features

The devices specified in (D) and (D)+1 will be converted to the upper and lower 8-bit values respectively.

✎Note:  If continuous execution instructions are used, conversion will be performed every scan cycle.

Error code

Example

When the rising edge of M0 is triggered, the low 8 bits and the high 8 bits of D0 and D1 are swapped, and D0=H8F2A, D1=H3412 are obtained.

BTOW/Byte unit data merge

BTOW(P)

Combine the low 8 bits of (N) bytes of BIN 16-bit data stored after the device number specified in (S) into word units and store it after the device number specified in (D).

-[BTOW (S) (D) (N)]

Content, range and data type

Device used

Features

After the device number specified in (s), the lower 8 bits of the 16-bit BIN data stored in (n) bytes are combined into word units and stored in the device number specified in (d) or later.

The upper 8 bits of (n) word data stored after the device number specified in (s) will be ignored. In addition, when (n) is an odd number, 0 is stored in the upper 8 bits of the device storing the (n)th byte of data.

£: the £th byte data;

(1): Ignore the high byte

*1: Carry below the decimal point.

Example

When (N)=5, the data up to the lower 8 bits of (S)+(S)+4 is stored in (D)+(D)+2.

(1): When (N)=5

(2): Change to 00H

By setting the number of bytes in (N), the range of byte data specified in (S) and the range of the device storing the combined data specified in (D) will be automatically determined.

When the number of bytes specified in (N) is 0, no processing is performed.

The upper 8 bits of the byte data storage device specified in (S) will be ignored, and the lower 8 bits will be the target.

Example

When the low 8 bits of D11 to D16 is stored in D12 to D14.

Even if the device range storing the data before merging overlaps the device rangestoring merged data, it will be handled as normal.

Error code

Example

When M0 is ON, the data of D20 to D25 is separated according to byte units, and then stored in D10 to D12.

WTOB/Byte unit data separation

WTOB(P)

After separating the BIN 16-bit data stored after the device number specified in (S) into (N) bytes, store it after the device number specified in (D).

-[WTOB (S) (D) (N)]

Content, range and data type

Device used

Features

After separating the BIN 16-bit data stored after the device number specified in (S) into (N) bytes, store it after the device number specified in (D).

1. High byte;
2. Low byte;
3. High byte data;
4. Low byte data;
5. *1: Carry below the decimal point.

Example

In the case of (N)=5, store the data up to the lower 8 bits of (S) to (S)+2 in (D) to (D)+4:

1. (N)=5 is ignored.
2. (N)=5.

By setting the number of bytes in (N), the range of BIN 16-bit data specified in (S) and the range of the device storing the byte data specified in (D) will be automatically determined.

When the number of bytes specified in (N) is 0, no processing is performed.

00H is automatically stored in the upper 8 bits of the byte data storage device specified in (D).

Example

When D12 to D14 is stored in the low 8 bits of D11 to D16

Even if the device range storing the data before merging overlaps the device rangestoring merged data, it will be handled as normal.

Error code

Example

When M0 is ON, the data of D10 to D12 are separated according to byte units, and then stored in D20 to D25.

DIS/4-bit separation of 16-bit data

DIS(P)

Store the data of the low (N) bits (1 bit of 4 bits) of the BIN 16-bit data specified in (S) into the low 4-bit of the (N) point starting from the device specified in (D).

-[DIS (S) (D) (N)]

Content, range and data type

Device used

Features

Store the low-(N) bit (1 bits of 4 bits) of the BIN 16-bit data specified in (S) in the low 4-bit of the (N) point starting from the device specified in (D).

The hig-12 bit of the point (N) starting from the device specified in (S) will become 0.

When (N)=0, it will become no processing, and the content of point (N) starting from the device of (D) will not change.

Error code

Example

When M0 is ON, D0 is separated every 4 bits and stored in D10 to D12. The result is D10 = HF, D11 = H8, D12 = HA.

UNI/4-bit combination of 16-bit data

UNI(P)

Combine the low 4 bits of the BIN 16-bit data of point (N) starting from the device specified in (S) into the BIN 16-bit device specified in (D).

-[UNI (S) (D) (N)]

Content, range and data type

Device used

Features

Combine the low 4 bits of the BIN 16-bit data at point (N) starting from the device specified in (S) into the BIN 16-bit device specified in (D).

The high (4-N) bits of the device specified in (D) will become 0.

When (N)=0, it will become no processing, and the content of the device in (D) will not change.

Error code

Example

When M0 is ON, the low 4 bits of D0 to D3 are combined and stored in D10, the value is H236F.

ZRST/Data batch reset

ZRST(P)

Perform a batch reset between the devices specified in (d1) and (d2) of the same type. It is used when interrupting operation, performing initial operation, or resetting control data.

-[ZRST (d1) (d2)]

Content, range and data type

Device used

Features

Perform batch reset between the devices specified in (d1) and (d2) of the same type.

As a separate reset instruction for the device, the RST instruction can be used for bit devices or word devices.

The batch write instruction of constant (for example: K0) has FMOV (P) instruction, which can write 0 to word devices (including bit device specification).

✎Note: Please specify the same type number for (d1) and (d2), and make (d1) number <(d2) number. When (d1) number ≥ (d2) number, only 1 point will be reset for the device specified in (d1).

ZRST(P) instruction is a 16-bit instruction, which can specify (LC) and (HSC) devices for (d1) and (d2).

Error code

Example

The function of this Circuit program instruction is to set the value of the D0 to D100 device to 0.

ZSET/Data batch set

ZSET(P)

Perform a batch set between the devices specified in (d1) and (d2) of the same type.

Content, range and data type

Device used

Features

·Perform a batch set between the devices specified in (d1) and (d2) of the same type.

·Write ON (set) in the entire device range of (d1) to (d2)

·As a separate set instruction for the device, the SET instruction can be used for bit devices.

Error code

Example

The function of this LAD instruction is to set the value of the M1 to M4 device to ON.

CRC/cyclic redundancy check instruction

CRC(P)

Calculate the CRC (Cyclic Redundancy Check) value, which is one of the error checking methods used in communications. In addition to CRC, error checking methods include parity and

Sum check (checksum), calculate horizontal parity check value and sum check value can use CCD(P) instruction . And this instruction is used in the generator polynomial that generates the CRC value (CRC-16)

"X 16 +X 15 +X 2 +1".

-[CRC(P) (S) (D) (N)]

Content, range and data type

Device used

Features

Start with the device specified in (S), generate the CRC value of 8-bit data (byte unit) at (N) point, and store it in (D).

The mode used by this instruction in calculation includes 16-bit conversion mode and 8-bit conversion mode. For the operation of each mode, please refer to the following content.

1. 16-bit conversion mode (when SM161=OFF)

Calculate the upper 8 bits (byte) and lower 8 bits (byte) of the (S) device. The result is stored in 16 bits of 1 point of the device specified in (D). In the case of the following program, perform the conversion as shown below.

2. 8-bit conversion mode (when SM8161=ON)

In 8-bit conversion mode, only the lower 8 bits (lower byte) of the (s) device are operated on. As a result, 2 points are used starting from the device specified in (d), the lower 8 bits (bytes) are stored in (d), and the upper 8 bits (bytes) are stored in (d)+1.

In the case of the following program, perform the conversion as shown below.

In the CRC(P) instruction, the generator polynomial of the CRC value (CRC-16) uses "X16+X15+X2+1", but there are also many standardized generator polynomials for the CRC value. If the generator polynomial is different, it will become a completely different CRC value, which should be noted. The main CRC value generator polynomials are shown below.

✎Note: 

When (s1) use KnX, KnY, KnM, KnS, n must be specified as 4.

Error code

Example

1. 16-bit conversion mode

2. 8-bit conversion mode

CRC-XMODEM/cyclic redundancy check instruction 

CRC-XMODEM(P)

The device specified in (s) is used as the start, and the CRC value of 8-bit data (byte units) at point (n) is generated and stored in (d)

PLC Editor2 version that supports this command: 2.3.1 and above 

-[CRC-XMODEM(P)  (s)  (d)  (n)]

Content, range and data type

Device used

Features

CRC-XMODEM (Cyclic Redundancy Check-XMODEM, abbreviation: CRC-XMODEM) is one of the error checking methods used in communication. In addition to CRC-XMODEM, there are also parity and checksum (checksum) error checking methods, and the CCD (P) instruction can be used to calculate the horizontal parity and checksum values.

The polynomial for generating the CRC-XMODEM value (CRC-CCITT) in this command uses "X16+X12+X5+1"

The modes used in this instruction for calculation are 16-bit conversion mode and 8-bit conversion mode. For the action of each mode, please refer to the following.

(1) 16-bit conversion mode (when SM161=OFF)

The high 8 bits (bytes) and low 8 bits (bytes) of the device in (s) are operated. The result is stored to the 16 bits of the soft element 1 point specified in (d).

In the case of the following program, the conversion is executed as follows

(1) 8-bit conversion mode (when SM161=ON)

In the 8-bit conversion mode, only the low 8 bits (low byte) of the device of (s) are operated. The result uses 2 points from the soft component specified in (d), storing the low 8 bits (bytes) in (d) and the high 8 bits (bytes) in (d) + 1.

In the case of the following program, the conversion is executed as follows

The CRC value (CRC-CCITT) in the CRC-XMODEM(P) instruction uses "X16+X12+X5+1" in the generating polynomial, but there are many standardized generating polynomials for CRC values. If this generating polynomial is different, it will become a completely different CRC value and should be noted. The main generating polynomials for CRC values are shown below.

Error code

Example

③16-bit conversion mode

④8-bit conversion mode

LRC/longitudinal redundancy check 

LRC(P)

The device specified in (s) is used as the start, and the data to be checked (2n characters) is summed two by two into a hexadecimal value and stored in (d).

PLC Editor2 version that supports this command: 2.3.1 and above 

-[LRC(P)  (s)  (d)  (n)]

Content, range and data type

Device used

Features

Longitudinal Redundancy Check (LRC) is a common form of checksum used in communications, also known as LRC checksum or longitudinal checksum. It is an error detection method that generates check bits from a specific bit string on a vertical channel. LRC is often used in conjunction with VRC in the row and column format, so that for each character check digit.

The specific algorithm is as follows.

(1) Sum the data to be verified (2n characters) two by two to form a hexadecimal value.

(2) Modulo the summation result with 256.

(3) the resulting modulus is subtracted from 256 to get the result of the checksum (another method: the modulus is inverted by bit and then added to 1).

Example of hexadecimal data: 01 A0 7C FF 02

(Hexadecimal calculation)

Summation: 01 + A0 + 7C + FF + 02 = 21E Modulo: 21E % 100 = 1E Calculation: 100 - 1E = E2

(Calculated in decimal)

Summation: 01 + 160 + 124 + 255 + 02 = 542 Modulo: 542 % 256 = 30 Calculation: 256 - 30 = 226

The modes used in this instruction for calculation are 16-bit conversion mode and 8-bit conversion mode. For more information on the actions of each mode, see the following section.

(1) 16-bit conversion mode (when SM161=OFF)

The high 8 bits (bytes) and low 8 bits (bytes) of the device in (s) are operated. The result is stored to the 16 bits of the device 1 point specified in (d).

In the case of the following program, the conversion is executed as follows

(1) 8-bit conversion mode (when SM161=ON)

In the 8-bit conversion mode, only the low 8 bits (low byte) of the device of (s) are operated. The result uses 2 points from the soft component specified in (d), storing the low 8 bits (bytes) in (d) and the high 8 bits (bytes) in (d) + 1.

In the case of the following program, the conversion is executed as follows

✎Note: 

When (s1) use KnX, KnY, KnM, KnS, n must be specified as 4.

Error code

Example

⑤16-bit conversion mode

LRC operation is performed on the high 8 bits (bytes) and low 8 bits (bytes) of the 6 device starting at (D100). The result is stored to the 16 bits of the (D0) soft component.

⑥8-bit conversion mode

The low 8 bits (low byte) of the 6 device from (D100) are operated. The result uses 2 points from (D0) designated device, and stores the low 8 bits (bytes) in (D0) and the high 8 bits (bytes) in (D1).

STDEV/BIN 16-bit sample standard deviation

STDEV(P)

The standard deviation of the (n) points (16-bit data units) starting from the device specified in (s1) is calculated, and the result of the calculation is stored in (d) by rounding.

PLC Editor2 version that supports this command: 2.3.1 and above 

-[STDEV(P)  (s1)  (d)  (n)]

Content, range and data type

Device used

Error code

The standard deviation of the 5 device (16-bit data units) starting from the device specified in (D1) is calculated, and the result of the calculation is stored in (D10).

DSTDEV/BIN 32-bit sample standard deviation

DSTDEV(P)

The standard deviation of the (n) points (32-bit data units) starting from the device specified in (s1) is calculated, and the result of the calculation is stored in (d) by rounding.

PLC Editor2 version that supports this command: 2.3.1 and above 

-[DSTDEV(P)  (s1)  (d)  (n)]

Content, range and data type

Device used

Error code

The standard deviation of the 5 device (16-bit data units) starting from the device specified in (D1,D2) is calculated, and the result of the calculation is stored in (D20,D21)