Siemens 620 appendix Controller, Cursor Control, Dimm, Disk Drive

Glossary

Controller

Integrated hardware and software controllers that control the functions of certain internal or peripheral devices (for example, the keyboard controller).

Cursor

Collective term for mouse pointer and text cursor.

Cursor Control

Keypad on the keyboard for controlling the cursor.

D

DC

Direct Current. Unidirectional electrical current.

DIMM

Dual Inline Memory Module. Memory RAM chips that are installed on the PCB, similar to the more common SIMM (Single Inline Memory Module) chips. The DIMM with its 64-bit data bus architecture has connections on both sides which are connected to different circuits for processing different instructions. SIMMs, however, have a 32-bit data bus architecture where all lines are connected to the same circuit for processing the same instructions. DIMMs can be installed in the computer as single chip, SIMMs, on the contrary, only in pairs.

Device Configuration

The configuration of a programming device contains information on hardware and device options, 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 configure 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.

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).

SIMATIC Box PC 620 Manual	Glossary-5
A5E00131465-01