Automating Manufacturing Systems - Process Control and ...

plc glossary - 35.30
to 16 bits).
work - the transfer of energy.
write - a digital value is stored in a memory location.
WYSIWYG (What You See Is What You Get) - newer software allows users to review things on the screen
before printing. In WYSIWYG mode, the layout on the screen matches the paper version exactly.
35.24 X
X.25- a packet switching standard by the CCITT.
X.400 - a message handling system standard by the CCITT.
X.500 - a directory services standard by the CCITT.
X rays - very high frequency electromagnetic waves.
X Windows - a window driven interface system that works over networks. The system was developed at
MIT, and is quickly becoming the standard windowed interface. Personal computer
manufacturers are slowly evolving their windowed operating systems towards X-Windows like
standards. This standard only specifies low level details, higher level standards have been
developed: Motif, and Openlook.
XFER - transfer.
XMIT - transmit.
xmodem - a popular protocol for transmitting files over text based connections. compression and error
checking are included.
35.25 Y
ymodem - a popular protocol for transmitting files over text based connections. compression and error
checking are included.
35.26 Z
zmodem - a protocol for transmitting data over text based connections.