Honeywell VRX180 Performing Data Storage, Data Storage File Extensions, Data Type File extension

Programming and Operating Concepts

Performing Data Storage

Configuring the instrument to store the first category, Data Storage (process and diagnostic data) is done through an Online menu entitled DATA STORAGE. All aspects of preparing a DOS formatted disk to accept process and diagnostic data information are managed through this menu’s selections. Process and diagnostic data may be stored on the same disk, but not along with other storage types (i.e., configuration, setpoint programs, or calibration).

The four types of process data are:

Trends - Data comprising the classic horizontal or vertically oriented time-varying traces that represent process parameters.

Unit Data - Process parameter information collected and displayed in tabular or datalog format.

Alarms - A record of any alarms that activated while the instrument was monitoring and/or controlling your process.

Events - A record of any discrete events that might have occurred while the instrument was monitoring and/or controlling your process. Discrete events may occur, for example, in the instrument’s execution of a set point profile.

When the instrument is On line and performing Data Storage, a separate and distinct disk file will be established for each process data type along with a file for diagnostic errors. Each file will be distinguished by a file extension as indicated in Table 3-11.

	Table 3-11 Data Storage File Extensions
Data Type			File extension
Trends		.LNT
Unit Data			.LNU
Alarm History			.LNA
Discrete Event		.LNE
Diagnostics		.LND

You can specify which process data types are written to disk and whether or not diagnostic errors are stored by setting up data storage schedules, accessible under a prompt entitled SET UP NEW SCHEDULES under the DATA STORAGE menu. Up to Eight files may be written to disk while the instrument performs Data Storage – four trend files, one unit data file, one alarm file, one event file, and one diagnostics file.

SET UP NEW SCHEDULES lets you designate several other parameters, such as the data storage rate (i.e., the distance in time between adjacent samples of a recorded process data parameter), the eight- character file names used to identify each process and diagnostic data file, and whether or not the Data Storage takes place in continuous or batch modes. Data Storage files may be configured to “rollover” after they have become full. That is, after the space on the disk for each file type has run out, all of the oldest data on the disk is overwritten with the most recent data.

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