Siemens Sinumerik 840D sl Programming Manual page 140

Abbreviations
CPU Central Processing Unit: Central processing unit
CR Carriage Return
CTS Clear To Send (clear to send messages for serial data interfaces)
CUTOM Cutter radius Compensation: Tool radius compensation
DB Data Block in the PLC
DBB Data Block Byte in the PLC
DBW Data Block Word in the PLC
DBX Data block bit in the PLC
DC Direct Control: Movement of the rotary axis via the shortest path to the absolute position within one
revolution.
DDE Dynamic Data Exchange: Dynamic Data Exchange
DTE Data Terminal Equipment
DIO Data Input/Output: Data input/output
DIR Directory: Directory
DLL Dynamic Link Library: Module which a program can access at runtime. Often contains program
sections that are required by different programs.
DOE Data transmission equipment
DOS Disk Operating System: Operating system
DPM Dual-Port Memory: Dual-port memory
DPR Dual-Port RAM: Dual port write/read-only memory
DRAM Dynamic Random Access Memory: Dynamic write/read-only memory
DRF Differential Resolver Function: Differential revolver function (handwheel)
DRY Dry Run: Dry run feedrate
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling