Siemens SIMATIC Box PC 840, Manual

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Glossary
Glossary-8
SIMATIC Rack PC 840 Manual
A5E00104826-03
Function Keys
Function keys can be divided into two different types; the normal function keys
which are assigned a particular function of the computer (for example, delete key),
and programmable function keys (softkeys).
G
Gender Changer
The Gender Changer is used to convert the COM1/V24/PLC interface of the
SIMATIC PC family to a common socket.
H
Hard Copy
The output of the complete contents of the screen on a printer is called a hard
copy.
Hard Disk Drive
Hard disk drives (Winchester drives) are a form of magnetic disk memory where
the magnetic disks are permanently built into the drive.
Hibernate
See Dormancy .
HMI
H uman M achine I nterface
HTML
H yper t ext M arkup L anguage is the markup language used for documents on the
World Wide Web. HTML is an application of SGML (Standard Generalized Markup
Language) that uses tags to mark elements, such as text and graphics, in a
document to indicate how Web browsers should display these elements to the user
and should respond to user actions such as activation of a link by means of a key
press or mouse click.
HTTP
H yper t ext T ransfer P rotocol is the protocol used to carry requests from a browser
to a Web server and to transport pages from Web servers back to the requesting
browser.