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Glossary
Configuration Software
The configuration software brings the device configuration up to date when
modules are installed. This is done either by copying the configuration files
supplied with the module or by manual configuration.
Controller
Integrated hardware and software controllers that control the functions of certain
internal or peripheral devices (for example, the keyboard controller).
Cursor
Pointer that shows the position on the screen at which the next entry will appear.
Cursor Control
Keypad on the keyboard for controlling the cursor.
D
DC
Direct Current. Unidirectional electrical current.
Device Configuration
The configuration of a PC or PG contains information on the hardware and options
of the device, such as memory configuration, drive types, monitor, network address
etc. The data are stored in a configuration file and enable the operating system to
load the correct device drivers and assign the correct device parameters.
If changes are made to the hardware configuration, the user can change entries in
the configuration file using the SETUP program.
DIMM
dual inline memory module. A type of memory board composed of RAM chips
mounted on a circuit board, similar to the more commonly used SIMM (Single
Inline Memory Module). DIMMs are characterized by a 64-bit data path and pins
(connectors) on each side that are on different circuits and that respond to different
signals. SIMMs, in contrast, have a 32-bit data path, and their connectors are on
the same circuit and respond to the same signal. While SIMMs must be added in
pairs, DIMMs can be added to a computer one at a time.
Disk Drive
The disk drive (floppy disk drive) is used to store programs and data on diskette
(write access) or to load from diskette to the computer (read access).
Glossary-4
SIMATIC Box PC 840 Manual
A5E00085984-04

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