Table of Contents
Advertisement
3.14 Data Storage
A unique feature of the instrument is its handling of data storage to 1.44 MB or 120 MB disks. The unit's
front bezel must be closed for any disk drive operations to take place. 1.44 MB disks may be formatted in
the instrument or on a PC.
Read this overview thoroughly to understand the fundamentals behind the instrument's data storage
capabilities.
Categories of Stored Data
There are four categories of disk storable data. Each category of data is stored in its own unique file. The
categories are:
1.
Data Storage
2.
Configuration Storage
3.
Setpoint Program Storage
4.
Calibration Storage.
Da ta Sto ra ge
Pro ce s s D a ta
Tre nd s
Un i t D a ta
Al a rm s
Eve n ts
The first category of stored data, Data Storage, is comprised of two types of data: process data and
diagnostic data. When the instrument stores these data types it is essentially functioning as a recorder.
Process data is comprised of up to six files containing historical information on the process that the
instrument is monitoring and/or controlling, such as the temperature trend or a log of a furnace over time.
Process data also includes any alarm or discrete event information.
Diagnostic data is the result of the instrument's execution of diagnostic routines during instrument start-up
and maintenance procedures (such as calibration). Online operation is also monitored to detect both
process faults and internal electronic errors. If a diagnostic error occurs, a record of it can be stored to a
single diagnostic file.
The second category of stored data is configuration storage, which is a single file comprised of the
instrument's programming and configuration. Configuration storage includes the programming of the
instrument's analog input characteristics, the configuration of its control loops, or, perhaps, the
programming of any math or logic functions.
The third category of stored data is Setpoint Program storage, which is a single file –a setpoint program–
containing one to four setpoint profiles, depending on the instrument. Recall that set point profiles are user
specified plots of process values against time that are divided into ramp and soak segments of varying time
lengths. Setpoint programs may be stored to disk or to the instrument's memory.
The fourth category of stored data is calibration storage, which is a file containing the instrument's analog
input and output calibration. This file may be used to restore calibration in the event that a full calibration,
using a calibration source and/or meter, cannot be performed.
12/00
Co n fi gu ra tio n
Di a g no s tic D a ta
Figure 3-32 Categories of Stored Data
VPR & VRX – User Manual
Programming and Operating Concepts
Se tp o i nt Pro g ra m
Ca l ib ra ti o n
73
Advertisement
Table of Contents
