Panasonic FP Series Programming Manual page 450

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Takes two's complement of 32-bit data specified by d if the trigger EN is in the ON-state. Two's

complement of the original 32-bit data is stored in d.

Two's complement is a number system used to express positive and negative numbers in binary

format. In this system, the number becomes negative if the most significant bit (MSB) of data is 1.

Two's complement is obtained by inverting all bits and adding 1 to the inverted result.

This instruction is useful for inverting the sign of 32-bit data from positive to negative or from

negative to positive.

Bit position

Decimal data

Bit position

Decimal data

This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which

is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the

"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears

under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming

area to open the list of recently used elements.

Availability of F86_DNEG (see page 1326)

In this example the function has been programmed in ladder diagram (LD) and structured text

(ST).The same POU header is used for all programming languages.

All input and output variables used for programming this function have been declared in the POU

32-bit data two's complement

32-bit area for storing original data and its two's complement

Arithmetic instructions