CMP instruction

Instruction description

This instruction compares two operational variables and outputs the comparison result to a specified bit variable. The operands are all algebra compared according to signed data.

D will occupy 3 continue bit variables address.

Program example

When X0=ON, M0 or M1 or M2 will be ON.

When X0=OFF, CMP will not be executed, M0, M1 and M2 keep the initial state. If user wants to clear the result of comparison, RST or ZRST could be used.

By series or parallel M0, M1 and M2 to achieve the results of ≤ or ≥ or ≠.

ZCP instruction

Instruction description

The operation is the same as the CMP instruction, except a single data value (S) is compared against a data range (S₁~S₂).

• S is less than S₁ and S₂ - bit device D is ON
• S is equal to or between S₁ and S₂ - bit device D +1 is ON
• S is greater than both S₁ and S₂ - bit device D +2 is ON
• S₁: Lower limit of comparison area
• S₂: Upper limit of comparison area
• S: Comparison variable
• D: Storage cell of comparison result; it will occupy three continuous bit variables.

Program example

When X0=ON, M3 or M4 or M5 will be ON.

When X0=OFF, ZCP will not be executed, M3, m4 and m5 keep the initial state. If user wants to clear the result of comparison, RST or ZRST could be used.

MOV instruction

Instruction description

The content of the source device (S) is copied to the destination (D) device when the control input is active. If the MOV instruction is not driven, no operation takes place.

For 32bit instructions (DMOV), two devices will be copied to the destination device, for example DMOV D1 D5, the result is D1→D5, D2→D6.

Program example

When M0 is on, D2=K4, when M0 becomes off, D2 keeps the initial value. Only when user copy another value to D2 or power off the plc or set plc off and on again, the value of D2 will change.

SMOV instruction

Instruction description

This instruction copies a specified number of digits from a 4 digit decimal source (S) and places them at a specified location within a destination (D) number (also a 4 digit decimal). The existing data in the destination is overwritten.

• M₁ - The source position of the 1st digit to be moved
• M₂ - The number of source digits to be moved
• n- The destination position for the first digit

Allows BCD numbers to be manipulated in exactly the same way as the ‘normal’ SMOV manipulates decimal numbers, i.e. This instruction copies a specified number of digits from a 4 digit BCD source (S) and places them at a specified location within a destination (D) number (also a 4 digit BCD number).

To select the BCD mode the SMOV instruction is coupled with special M coil M8168 which is driven ON. Please remember that this is a ‘mode’ setting operation and will be active, i.e. all SMOV instructions will operate in BCD format until the mode is reset, i.e. M8168 is forced OFF.

Program example

Suppose D8=K1234, D2=K5678, then when m8168 is off (bcd mode), set m2, then the value of D2 becomes K5128.

When m8168 is on (bin mode) and D8=H04D2=K1234, D2=H162E=K5678, set m2, then D2=H104E=K4174

CML instruction

Instruction description

A copy of each data bit within the source device (S) is inverted and then moved to a designated destination (D).

This means each occurrence of a ‘1’ in the source data will become a ‘0’ in the destination data while each source digit which is ‘0’ will become a ‘1’. If the destination area is smaller than the source data then only the directly mapping bit devices will be processed.

Program example

Example 1:

Example 2:

This program is equal to the below ladder diagrams.

Example 3:

BMOV instruction

Instruction description

A quantity of consecutively occurring data elements could be copied to a new destination. The source data is identified as a device head address (S) and a quantity of consecutive data elements . This is moved to the destination device (D) for the same number of elements .

When the special variable is M8024=ON, the transmission direction is opposite, i.e. S becomes the destination address, D becomes the source address.

When the operand is bit device, the digit number of S and D need to be the same.

Program example

Result

FMOV instruction

Instruction description

The data stored in the source device (S) is copied to every device within the destination range. The range is specified by a device head address (D) and a quantity of consecutive elements . If the specified number of destination devices exceeds the available space at the destination location, then only the available destination devices will be written to.

Program example

When M8 is on, k100→D100, k100→D101, k100→D102, k100→D103.

XCH instruction

Instruction description

The contents of the two destination devices S and D are swapped, i.e. the complete word devices are exchanged.

Program example

 Example 1:

Example 2:

This function is equivalent to SWAP the bytes within each word of the designated devices D1 are exchanged when ‘byte mode flag’ M8160 is ON. Please note that the mode will remain active until it is reset, i.e. M8160 is forced OFF.

BCD instruction

Instruction description

The binary source data (S) is converted into an equivalent BCD number and stored at the destination device (D).

If the converted BCD number exceeds the operational ranges of 0 to 9,999 (16-bit operation) and 0 to 99,999,999 (32-bit operation) an error will occur. M8067 will be ON, and D8067 will record the error code.

Programming example

The BIN value in D200 is converted to BCD value and the units’ digit is saved in K1Y0 (Y0 to Y3).

• If D200=H000E (hex) =K14 (decimal), then Y0~Y3=0100(BIN).
• If D200=H0028 (hex) =K40 (decimal), then Y0~Y3=0000(BIN).

BIN instruction

Instruction description

The BCD source data (S) is converted into an equivalent binary number and stored at the destination device (D). If the source data is not provided in a BCD format an error will occur. This instruction could be used to read in data directly from thumbwheel switches.

The value of S (BCD) ranges from 0 to 9999(16-bit) and 0 to 99999999(32-bit)

When the value of D is not BCD, there will be an error, and M8067 will be ON.

Program example

When M8 is ON, K1Y0 (BCD value) will be converted into BIN and stored in the D200.