CJ2 CPU Unit Software User's Manual - CIP ETI

9 PLC SetupBackground Execution SettingsThe following instruction will have a large affect on the cycle time, depending on the amount of datahandled by the instruction. The background execution settings can be used to divide processing of theinstructions over more than one cycle, to reduce the affect on the cycle time. Refer to 10-2-5 BackgroundExecution for details. Table Data Process InstructionsThis parameter determines whether to process Table Data Instructions in the background.Parameter Settings Default FunctionTable dataprocessinstructionsOFF: Not executedin background.ON: Executed inbackground.OFFThis setting determines if Table Data Instructionswill be processed over multiple cycletimes (i.e., processed in the background).Relatedflags andwords--- String Data Process InstructionsThis parameter determines whether to process String Data Instructions in the background.Parameter Settings Default FunctionString dataprocessinstructionsOFF: Not executedin background.ON: Executed inbackground.OFFThis setting determines if String Data Instructionswill be processed over multiple cycletimes (i.e., processed in the background).Relatedflags andwords--- Data Shift Process InstructionsThis parameter determines whether to process Data Shift Instructions in the background.Parameter Settings Default FunctionData shiftprocessinstructionsOFF: Not executedin background.ON: Executed inbackground.OFFThis setting determines if Data Shift Instructionswill be processed over multiple cycle times(i.e., processed in the background).Relatedflags andwords--- Com Port NumberThis parameter sets the communications port number used in background processing.Parameter Settings Default FunctionCom Portnumber0 to 7: Communicationsports 0 to 7(internal logicalports)0 (No. 0) The communications port number (internal logicalport) that will be used for background execution.Relatedflags andwords---Precautions for Correct UseBackground processing cannot be used in interrupt tasks if high-speed interrupt function isenabled in the PLC Setup. An instruction processing error will occur.9-12 CJ2 CPU Unit Software User’s Manual