Trend Parameters

The citect.ini file contains the following 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.
• [Trend]CacheSize6 - 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 - Default is True which preserves the original behaviour. If privilege is not checked a user with no privilege (0) can browse and view trends that require privilege 1.
• [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 CitectSCADA 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).

See Also