Logix5000 Controllers General Instructions - SLAC Confluence

254 Compute/Math Instructions (CPT, ADD, SUB, MUL, DIV, MOD, SQR, SQRT, NEG, ABS)FBD_MATH StructureInput Parameter: Data Type: Description:EnableIn BOOL Enable input. If cleared, the instruction does not execute and outputs are not updated.Default is set.SourceA REAL Value to add to SourceB.Valid = any floatSourceB REAL Value to add to SourceA.Valid = any floatOutput Parameter: Data Type: Description:EnableOut BOOL The instruction produced a valid result.Dest REAL Result of the math instruction. Arithmetic status flags are set for this output.Description:Arithmetic Status Flags:Fault Conditions:The ADD instruction adds Source A to Source B and places the resultin the Destination.Arithmetic status flags are affected.noneExecution:Relay LadderCondition:prescanrung-condition-in is falserung-condition-in is truepostscanAction:The rung-condition-out is set to false.The rung-condition-out is set to false.Destination = Source A + Source BThe rung-condition-out is set to true.The rung-condition-out is set to false.Publication 1756-RM003I-EN-P - January 2007