eWON General Reference Guide - eWON wiki

8.3.10 $dtIV [Instant Values]
General Reference Guide Export Block Descriptors
8.3.10.1 Instant value - general information
Instant value means values of Tags at a given time. The file of instant value contains for each Tag the following information:
• The file containing the instant values for every Tag is available in binary or text format; you can download the instant values file
directly from the root of the eWON root file list, or you can address it by using an Export Block Descriptor.
• The instant values file normally contains all the Tags, but there is an additional feature that allows obtaining only the instant values
from specific Tags.
• In the Tag definition, there is a new config in the "Tag visibility section".
• There is a group of 4 check boxes, each of them being associated to a group called A, B, C, D (4 groups).
• Every Tag can belong to no group, one group, or more than one group.
• These groups are only used when reading the instant values using an Export Block Descriptor; in that case there is an additional field
in the Export Block Descriptor. That allows to request the instant values for the Tags belonging to one or more groups.
IMPORTANT:
Regardless of the group definition for each of the Tags, the inst_val.txt and inst_val.bin files (see below) always return the instant
value for ALL Tags.
These groups have nothing in common with the A, B, C topics of the IO servers. They are defined in the context of the Instant
Values!
• Root file access
In the eWON root folder (FTP access or file transfer) you will find the following 2 files:
8.3.10.2 Alarm status code values
The below table lists the different values that the field AlStatus can have, depending on the Alarm State and of the action the user has performed
on it:
Alarm Status
TagId Id of the Tag
TagName Name of the Tag (in text mode)
Value Current value of the Tag
AlStatus Current alarm status of the Tag
AlType Type of the current alarm
Table 186: $dtIV - instant value file’s informations
inst_val.txt instant values in text mode
inst_val.bin instant values in binary mode
Alarm Status
Value
Alarm status explanations
NONE 0 Tag is not in alarm status
PRETRIGGER 1
Tag is in pretrigger alarm statusWarning: we assume there is no alarm if
AlStatus value