The Subtract instruction is a ladder logic rung output instruction that subtracts two values. The instruction is enabled when the preceding logic is true and disabled otherwise. Source B is subtracted from Source A and placed in the Destination tag. The values can be constants, tags or any combination.
List of possible arguments
SOURCE A and SOURCE B can be any combination of the following data types.
- CONSTANT Can’t be the DESTINATION obviously
Note: Negative numbers are valid. Arithmetic status flags are affected (S:V, S:Z, S:N, S:C). Overflow, Zero, Negative, and Carry.