AppendixA.1 List of abbreviationsJob planning904 Programming Manual, 02/2011, 6FC5398-2BP40-1BA0NC Numerical Control: Numerical ControlNCK Numerical Control Kernel: NC kernel with block preparation, traversing range, etc.NCU Numerical Control Unit: Hardware unit of the NCKNRK Name for the operating system of the NCKIS Interface signalNURBS Non-Uniform Rational B-SplineZO Zero offsetOB Organization block in the PLCOEM Original Equipment ManufacturerOP Operator Panel: Operating setupOPI Operator Panel Interface: Interface for connection to the operator panelOPT Options: OptionsOSI Open Systems Interconnection: Standard for computer communicationsP bus Peripheral BusPC Personal ComputerPCIN Name of the SW for data exchange with the controlPCMCIA Personal Computer Memory Card International Association: Standard for plug-inmemory cardsPCU PC Unit: PC box (computer unit)PG Programming devicePLC Programmable Logic Control: Interface controlPOS PositioningRAM Random Access Memory: Program memory that can be read and written toREF Reference point approach functionREPOS Reposition functionRISC Reduced Instruction Set Computer: Type of processor with small instruction set andability to process instructions at high speedROV Rapid override: Input correctionRPA R-Parameter Active: Memory area on theNCK for R parameter numbersRPY Roll Pitch Yaw: Rotation type of a coordinate systemRTS Request To Send: RTS, control signal of serial data interfacesSBL Single Block: Single blockSD Setting DataSDB System Data BlockSEA Setting Data Active: Identifier (file type) for setting dataSFB System Function BlockSFC System Function CallSK SoftkeySKP SKiP: Skip blockSM Stepper MotorSPF Sub Routine File: SubprogramPLC Programmable Logic Controller