Logix5000 Controllers General Instructions - SLAC Confluence

452 Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT)Temporary End (TND)The TND instruction acts as a boundary.Operands:Relay Ladder OperandsnoneTND();Structured TextnoneYou must enter the parentheses () after the instruction mnemonic,even though there are no operands.Description:When enabled, the TND instruction lets the controller execute logiconly up to this instruction.When enabled, the TND instruction acts as the end of the routine.When the controller scans a TND instruction, the controller moves tothe end of the current routine. If the TND instruction is in asubroutine, control returns to the calling routine. If the TNDinstruction is in a main routine, control returns to the next programwithin the current task.Arithmetic Status Flags:Fault Conditions:not affectednoneExecution:Condition Relay Ladder Action Structured Text Actionprescan The rung-condition-out is set to false. No action taken.rung-condition-in is false The rung-condition-out is set to false. narung-condition-in is true The instruction executes.naThe rung-condition-out is set to true.EnableIn is set na EnableIn is always set.The instruction executes.instruction execution The current routine terminates. The current routine terminates.postscan The rung-condition-out is set to false. No action taken.Publication 1756-RM003I-EN-P - January 2007