Siemens Sinumerik 840D sl Programming Manual page 144

Abbreviations
NCU Numerical Control Unit: Hardware unit of NCK
IS Interface Signal
NURBS Non-Uniform Rational B-Spline: Rational B-spline curves
ZO Work offset
OB Organization block in the PLC
OEM Original Equipment Manufacturer: Manufacturer whose products are marketed under an external
company name.
OP Operator Panel: Operating equipment
OPI Operator Panel Interface: Operator panel front connection
P-Bus Peripheral Bus
PC Personal Computer
PCIN Name of the SW for data exchange with the control
PCMCIA Personal Computer Memory Card International Association: Memory plug-in card standardization
PG Programming device
PLC Programmable Logic Control: Interface control
RAM Random Access Memory: Data memory that can be read and written to
REF "Reference point approach" function
REPOS "Reposition" function
ROV Rapid override: Rapid traverse override
RPA R Parameter Active: Memory area in the NCK
for R-NCK for R parameter numbers
RPY Roll Pitch Yaw: Rotation type of a coordinate system
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling