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Glossary
SOM
Safecard On Motherboard consists of monitoring blocks on the motherboard, a
driver and the SOM program. This allows the monitoring functions of different
temperatures and the way programs run (Watchdog).
STEP 5 Basic Package
This is a software package which represents the basis for all other STEP 5
software packages. With the programmer (PG), this package is used to program
PLCs in the SIMATIC S5 family. The language used is known as STEP 5.
STEP 7
Programming software for the creation of user programs for SIMATIC S7 control.
T
Text Cursor
The cursor shows where text may be entered, for example, in text editors and in
dialog windows. In many applications the position of the cursor can be changed by
moving and clicking the mouse pointer.
Touchpad
The Touchpad is used in many programs (with mouse control) as an input device
for cursor control and menu operation. The Touchpad works with touch-sensitive
sensors. The cursor can be moved over the screen with the touch of a finger.
TFT Display
Thin-film-transistor color display
U
USB
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).
Glossary-14
SIMATIC Box PC 840 Manual
A5E00085984-04

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