Honeywell VPR100 User Manual page 91

Initializing a disk
To activate the new data storage schedules that have been configured in the SET UP NEW SCHEDULES
menu requires you to "initialize" the DOS formatted floppy disk to which process and diagnostic data will
be stored. This is done by executing a routine entitled INITIALIZE DISK, also found in the DATA
STORAGE menu. The task of initializing a disk and activating data storage schedules are one and the
same.
ATTENTION
Initializing a disk is only necessary for performing Data Storage. You do not have to initialize a disk to perform
Configuration, Set Point Program, or Calibration Storage
When executing the INITIALIZE DISK menu prompt, you will observe two selections: USE NEW
SCHEDULES and USE CURRENT SCHEDULES. The "SCHEDULES" in both selections refer to the
data storage schedules prepared in the SET UP NEW SCHEDULES menu described earlier. USE NEW
SCHEDULES to initialize the disk to activate a newly configured data storage schedule for the very first
time. The only time you will USE NEW SCHEDULES again is after you have made any changes to the way
the data storage schedules have been configured. You must USE NEW SCHEDULES to initialize the disk
in order for these changes to take effect. USE CURRENT SCHEDULES to initialize a disk if the disk will
replace one that has become full. This will ensure that data being recorded continues uninterrupted over the
space of both the full and replacement disks. During the time when the full disk is being replaced with a
new disk, recorded data will be stored to the instrument's memory buffer. Upon completing initialization
via the USE CURRENT SCHEDULES prompt, all buffered data will be written to the new disk and data
storage will resume, with no lapses of storage between disks.
During initialization, the disk's surface is scanned for bad clusters to ensure its integrity. If any cluster is
determined to be bad, the disk will be rejected and the initialization will fail. Disk initialization also
allocates sections of the disk to each of the files you have elected to store per the SET UP NEW
SCHEDULES menu. Once the instrument completes initializing the disk, process and diagnostic data
recording begins immediately, indicated by a yellow-colored letter "S" in the lower right hand corner of the
instrument screen.
Data Storage Status
The prompt DATA STORAGE STATUS, accessed from the Online DATA STORAGE menu, displays a
calculation of how long a particular floppy disk will last based on the configured data storage schedule.
Disk capacity is indicated in days, hours, and minutes remaining on the disk.
After the instrument has been Online and actively performing Data Storage to floppy, a warning message
will appear when the disk reaches the default 90% capacity, or a user-specified capacity. Once a disk has
reached its programmed capacity, a DISK FULL message will be displayed.
Process and Diagnostic Data Integrity
The instrument is equipped with several features to ensure data integrity. The instrument will not store data
to disk if its front bezel is open. A BEZEL OPEN message will appear on all displays and process and
diagnostic data meant for disk storage will be kept in the instrument's memory buffer. Data corruption and
loss are, therefore, not issues if someone walks up to the instrument and simply removes the Data Storage
disk. Note that when performing Data Storage, the instrument writes to the disk only once a minute. This
ensures that the latest data is always on disk. In the event of a power failure, at most one minute of data
would be lost.
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Programming and Operating Concepts
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