Siemens SIMATIC HMI TP27 Equipment Manual page 218

Glossary
A
Alarm message
Calls attention to high-priority operating states and has therefore to be ac-
knowledged.
Alarm time
Time between the arrival and departure of an alarm message.
Area pointer Required for data exchange between the TP and the PLC. It contains informa-
tion concerning the length and size of data areas on the PLC.
Arrival of a The point in time at which a message is issued by the PLC or TP.
message
Automation
PLCs of the SIMATIC S7 series – for example, SIMATIC S7-200/300/400)
systems
B
Blanking
Automatic turn-off of display back lighting.
Boot A load operation which transfers the operating system to working memory on
the TP.
Button
Touch-sensitive area on the screen of a Touch Panel with configured function-
ality. Buttons replace, among other things, system keys and function keys on
the TP37.
TP27, TP37 Equipment Manual
Release 01/00
Glossary-1