Logix5000 Controllers General Instructions - SLAC Confluence

Compute/Math Instructions (CPT, ADD, SUB, MUL, DIV, MOD, SQR, SQRT, NEG, ABS) 257Subtract (SUB)The SUB instruction subtracts Source B from Source A and places theresult in the Destination.Operands:Relay LadderOperand: Type: Format: Description:Source A SINT immediate value from which to subtract Source BINTtagDINTSource BREALA SINT or INT tag converts to a DINT value by sign-extension.SINT immediate value to subtract from Source AINTtagDINTDestinationREALA SINT or INT tag converts to a DINT value by sign-extension.SINT tag tag to store the resultINTDINTREALStructured Textdest := sourceA - sourceB;Use the minus sign “−” as an operator in an expression. Thisexpression subtracts sourceB from sourceA and stores the resultin dest.See Appendix B for information on the syntax of expressions withinstructured text.Function BlockOperand: Type: Format: Description:SUB tag FBD_MATH structure SUB structurePublication 1756-RM003I-EN-P - January 2007