Siemens simatic hmi op27 Equipment Manual page 224

Glossary
A
Alarm message Calls attention to high-priority operating states and has therefore to be
acknowledged.
Alarm time Time between the arrival and departure of an alarm message.
Area pointer
Required for data exchange between the OP 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 OP.
message
AT expansion slot Option for the OP37 for accommodating two 2/3-length 16 bit AT cards.
Automation
PLCs of the SIMATIC S7 series – for example, SIMATIC S7-200/300/400
systems
B
BIOS Setup
Contains basic settings for the OP37 in DOS mode.
Blanking
Automatic turn-off of display back lighting.
Boot A load operation which transfers the operating system to working memory on
the OP.
C
Configuration
Definition of system-specific basic settings, messages and screens using the
ProTool configuration software.
OP27, OP37 Equipment Manual
Release 05/99
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Glossary-1