Trend Parameters

[Trend]AbortStartupOnError- If set and the history file properties of any Trend tag have been modified, restart of the Trend Server will not occur because the history files can not be reloaded.

[Trend]AcquisitionTimeout - stops a trend server from infinitely acquiring a valid data sample from a disconnected I/O device

[Trend]AllFiles - Indicates whether trend history files should be created at startup or created when needed.

[Trend]BlockByIODevice - Obsolete in version 7.0.

[Trend]BytesReadBeforeSleep - Controls the amount of data read from the trend archive before the trend server has to sleep.

[Trend]BytesWrittenBeforeSleep - Specifies how many bytes of trend data are written to file by the TrendWriteTask before it sleeps.

[Trend]CacheSize0 - Determines the number of samples that can be stored in the cache of a trend with sample period < 50ms.

[Trend]CacheSize1 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 50ms and < 250ms.

[Trend]CacheSize2 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 250ms and < 1 second.

[Trend]CacheSize3 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 1 second and < 5 seconds.

[Trend]CacheSize4 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 5 seconds and < 10 seconds.

[Trend]CacheSize5 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 10 seconds and < 20 seconds.

- Determines the number of samples that can be stored in the cache of a trend with sample period >= 20 seconds and < 50 seconds.

[Trend]CacheSize7 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 50 seconds < 100 seconds.

[Trend]CacheSize8 - Determines the number of samples that can be stored in the cache of a trend with sample period >= 100 seconds.

[Trend]ClientRequestTime - The delay (in milliseconds) after real-time trend data is requested from the Trends Server before the next data is requested.

[Trend]CopyFilesMessage - Determines whether the redundant Trends Server displays an alert message if it cannot find any trend files.

[Trend]CPU - Obsolete in version 7.0.

[Trend]CursorColor - Allows the cursor color to be specified.

[Trend]CursorColour - Obsolete in version 7.20 (replaced by [Trend]CursorColor).

[Trend]DeleteIfIncompatible - Deletes incompatible history files automatically.

[Trend]Disable - Enables/disables the Trends Server.

[Trend]EnableBackfill - Allows trend backfill to be disabled.

[Trend]FileCreationWriteSize - Controls the rate at which trend files are initialised (whether created at startup or runtime).

[Trend]FileNameType - Specifies whether your trend file names will be long or short.

[Trend]FilterViewByPrivilege - Determines if the results from a trend browse will be filtered according to privilege.

[Trend]GapFillMode - Determines which method is used to fill gaps in a trend file and graph caused by missing trend samples.

[Trend]GapFillSamples - Determines whether gaps in a trend graph caused by missing samples are filled (determined by the number of samples missed).

[Trend]GapFillTime - Determines whether gaps in a trend graph caused by missing samples are filled (determined by the duration of the gap).

[Trend]InhibitEvent - Inhibits event trends on startup.

[Trend]InstantTrendIdleTime - Set this parameter to specify the maximum number of seconds that an unused instant trend will be retained.

[Trend]InstantTrendSamples - Set this parameter to determine the maximum number of samples that will be retained for an individual instant trend.

[Trend]MaxBackfillsAtOnce - Determines the number of trend to be requested for backfill at a time.

[Trend]MaxRdnSamples - Determines the maximum samples to be requested for a trend at a time.

[Trend]MaxRequestLength - Determines the maximum number of trend sample requests allowed per trend.

[Trend]MaxSetTableQue - Determines the maximum number of SetTrendTable requests on the primary trend server to be transferred to the standby server.

[Trend]MaxSetTableStnbyPending - Controls the maximum number of pending SetTrendTable requests to the standby trend server.

[Trend]MissedSamplesAlarmTime - Controls the amount of trend data that can be missed before a hardware alarm is triggered.

[Trend]Process - Obsolete in version 7.0.

[Trend]RangeCheck - Checks for invalid trend sample values.

[Trend]ReadWatchTime - Determines how long the trend server will wait (in milliseconds) between each file read of trend samples.

[Trend]Redundancy - Obsolete in version 7.0.

[Trend]ReloadBackOffTime - Back-off time configured to control the pace of the reload on an Trend server.

[Trend]Server - Obsolete in version 7.0.

[Trend]ShowCacheSizes - Determines whether the currently set values and sample period ranges for parameters [Trend]CacheSize0. . .[Trend]CacheSize8 are displayed in the Plant SCADA Kernel.

[Trend]StaggerRequestSubgroups - Obsolete in version 7.0.

[Trend]TrendDebug - Used to debug the trend system during commissioning.

[Trend]WatchTime - The delay (in milliseconds) after data is returned from the I/O device before data is requested for the next trend acquisition cycle.

[Trend]WriteWatchTime - The trend write task writes out trend data to disk, and then sleeps for the time specified in this parameter (before writing the next trend file).

AVEVA™ Plant SCADA

Trend Parameters

Table of Contents

Trend Parameters

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