Siemens SIMATIC HMI TP 170A Equipment Manual page 97

Glossary
Acknowledgement
Acknowledgement of an alarm message on the operating unit confirms that it has
been noted. After acknowledgement, the message disappears from the screen.
Alarm message
Provides information on the operating unit concerning operating errors on the
machine or system connected to the PLC. The message text may also contain
current measured values.
Since alarm messages indicate abnormal operating statues, they must be
acknowledged.
Alarm time
Time interval between the arrival and departure of an alarm message.
Area pointer
Defines a memory area in the PLC for data exchange between the PLC and
operating unit.
Bar graphs
Represent values from the PLC as rectangular areas. This is a way of displaying
filling levels or workpiece numbers, for example, on the operating unit.
Baud rate
Rate of speed at which data is downloaded. Baud rate is specified in Bit/s.
TP 170A Equipment Manual
Release 12/99
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