Siemens 620 appendix Touchscreen, Url Usb, User Interface, User program, Vga

Glossary

Touchscreen

The Touchscreen is a computer monitor developed and modified to recognize a touch on the screen surface. The user can move the cursor or select an option by touching the screen.

U

URL

Uniform Resource Locator is an address for a resource on the Internet. URLs are used by Web browsers to locate Internet resources. A URL specifies the protocol to be used in accessing the resource (such as http: for a World Wide Web page or ftp: for an FTP site), the name of the server on which the resource resides (such as //www.whitehouse.gov), and, optionally, the path to a resource (such as an HTML document or a file on that server).

USB

Acronym for universal serial bus. A serial bus with a data transfer rate of

12 megabits per second (Mbps) for connecting peripherals to a microcomputer. USB can connect up to 127 peripherals, such as external CD-ROM drives, printers, modems, mice, and keyboards, to the system through a single, general-purpose port. This is accomplished by daisy chaining peripherals together. USB is designed to support the ability to automatically add and configure new devices and the ability to add such devices without having to shut down and restart the system (hot plugging).

User Interface

The software-controlled menus and screens on the monitor through which the user communicates with the program.

User program

Contains all instructions, declarations and signal processing data that can be used for system or a process control. It is assigned to a programmable module (for example, CPU, FM) and can be split into smaller blocks (modules).

V

VGA

Video Graphics Array. Industrial standard graphics adapter for use with any commonly used software.

SIMATIC Box PC 620 Manual A5E00131465-01

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