In This Video, We will learn the Twos Complement Double Integer Instruction in Siemens PLC using STEP 7 Simatic Manager PLC Programming software.
NEG_DI (Twos Complement Double Integer) reads the content of the IN parameter and performs a twos complement instruction. The twos complement instruction is equivalent to multiplication by (-1) and changes the sign (for example: from a positive to a negative value).
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