Proficy Machine Edition Getting Started, GFK-1868H

Logic Developer - PCLadder EditorLADDER EDITORLadder logic may be the most popular language in use today for creating controlprograms. The ladder editor is a graphical tool for editing ladder programs inMachine Edition. With the ladder editor, you can work on a disk copy of a ladderprogram (offline) or with a live program as it runs in the Controller (online). Youcan also configure the appearance and behavior of the editor under the Optionstab of the Navigator.Ladder ProgramNavigator: Project tabladder logic nodesA ladder program is composed of rungs of ladder logic instructions that executesequentially from left to right, top to bottom. The instruction set includes standardIEC 61131-3 functions supplemented by a large library of advanced and I/Ospecific functions. Along with rungs and instructions, a ladder program contains:■Labels: Each default (START and END) or user-defined label is a rungproviding an entry point for program execution.■Subroutines: Each user-defined subroutine is a separate, reusablesection of logic that can be called from anywhere in a ladder program.■Actions: Each action is a separate block of logic that can be referencedin a Sequential Function Chart.TIPYou can also create User-Defined Function Blocks (UDFBs). Each UDFB is a callablesubroutine to and from which that you can pass parameters.Want to know more?In the Help Index, look up ladder and choose “Ladder Program: anOverview”. You can also look up “UDFB” and choose “User-definedFunction Blocks: an Overview”.To open a ladder program for editing• In the Project tab of the Navigator, under the Logic folder, double-click the Ladder_Program node.Your ladder program opens in the ladder editor.To locate a label• In the Project tab of the Navigator, under the Logic folder, under the Ladder Program folder, doubleclicka label node.Your ladder program, subroutine or action opens in a ladder editor window withthe label selected.GFK-1868HMachine Edition 5.50 41