Chapter 3
Tag Configuration
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National Instruments Corporation
3-45
Note
Although you can configure these parameters, it is highly recommended you
maintain the default values.
Table 3-12.
Configurable Memory Allocation Parameters
Parameter
Description
Default Value
System Events
display (lines
Determines the maximum number of lines of text to be
displayed in the System Errors and Events display of the
Engine Manager.
20
Error Message
repeat rate
(seconds)
Determines the time, in seconds, that recurring error
messages should be repeated to the user. For example,
an undefined tag message error repeats only after this
value is exceeded.
600 secs
(10 minutes)
Event History
Buffer size
(elements)
Determines the length, in elements of the queue that
handles event information sent from the Engine to
.evt
files.
2000
Historical Log
Queue (elements)
Determines the length, in elements, of the queue that
handles data sent from the engine to the Citadel
historical database.
2000
Server Input Queue
size (elements)
Determines the length, in elements, of the queue that
handles data sent from the device servers to the Engine.
2000
Server Input Queue
binary size (bytes)
Determines the length, in bytes, of the queue that
handles binary data (string tags) sent from the device
servers to the Engine.
2000
Server Output
Queue size
(elements)
Determines the length, in elements, of the queue that
handles data sent from the Engine to the device servers.
2000
Server Output
Queue binary size
(bytes)
Determines the length, in bytes, of the queue that
handles binary data (string tags) sent from the Engine to
the device servers.
2000
Server Shutdown
timeout (seconds)
Determines the time, in seconds, the Engine waits for all
active device servers to shutdown before asking the user
if the servers are to be forcefully terminated.
30
