Siemens SINUMERIK ONE NCU 1740 Equipment Manual page 162

Appendix
A.1 Abbreviations
KC Korean Certification
LAN Local Area Network
LED Light-Emitting Diode: light-emitting-diode display
LGPL Lesser General Public License
MAC Media Access Control
MCP Machine Control Panel
MPP Machine Pushbutton Panel
NCK Numerical Control Kernel: NC kernel with block preparation, traversing range, etc.
NCU Numerical Control Unit: NCK hardware unit
NVRAM Non-Volatile Memory: non-volatile memory
NX Numerical eXtension (axis extension module)
OP Operator Panel: operator panel front
OPC UA Open Platform Communications Unified Architecture: industrial communication protocol
OSS Open source software
PCU PC Unit: computer unit
PELV Protective Extra Low Voltage
PG Programming device
PLC Programmable Logic Control: programmable logic control (component of the CNC)
PN PROFINET
PP I/O modules
PTC Positive Temperature Coefficient
RAM Random Access Memory: program memory that can be read and written into
RCM Regulatory Compliance Mark
RFC Request for Comments
RSS Really Simple Syndication
RT Realtime: data exchange without isochronous mode
SD Secure Digital: secure digital memory card
SELV Safe Extra Low Voltage
SIOS Siemens Industry Online Support
SME Sensor Module External
SSH Secure Shell
TCU Thin Client Unit (communication with operator panels)
TCP Transmission Control Protocol
TS Teleservice
UDP User Datagram Protocol
UL Underwriters Laboratories
USB Universal Serial Bus
VDE Association of Electrical Engineering, Electronics and Information Technology (Germany)
VNC Virtual Network Computing
Full duplex An Ethernet/PROFINET port can simultaneously transmit and receive data.
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Equipment Manual, 10/2021, A5E51087503B AA
NCU 1740