Siemens OP7 Equipment Manual page 183

Glossary
A
Alarm message
Draws attention to particularly urgent operating states; alarm messages have
to be acknowledged for this reason.
Area pointer Required for enabling data transfer between the OP and the PLC. It contains
details of the location and size of data areas in the PLC.
Arrival of a
The time at which a message is initiated by the PLC or OP.
message
C
Configuration Definition of system-specific basic settings, messages and screens using
ProTool configuration software.
D
Departure of a
The time at which a message is withdrawn by the Programmable Logic PLC
message
Display function
Function resulting in the contents of the display being changed – for exam-
ple, "Display message level", "Display alarm buffer" and "Display screen".
Download mode
Operating mode of the OP in which data are transferred from the Program-
ming Unit to the OP.
Duration of display Time between the arrival of an event message and its departure.
Equipment Manual OP7, OP17
Release 04/99
Glossary-1