An enumerated data set provides an enhanced way of displaying data. It enables you to
retrieve numeric data as string state values. You can use the string values in reports,
charts, etc.
An enumerated set contains several states. A state is the number-string value pair in a
set. It contains a set of numeric values and their corresponding string values. You can
define an enumerated set for a single value or a range of values. These state values are
defined for data states stored in Data Archiver. Data is retrieved using the value of
the state. You have to define state values within a set to assign enumerated values.
Table 1. Example of a Single-Value Enumerated Set
| State Name |
State Value |
| Manual |
0 |
| Automatic |
1 |
Table 2. Example of a Range-of-Values Enumerated Set:
| State Name |
State Value |
| ON |
0 to 100 |
| OFF |
101 to 200 |
State names can be duplicated. If duplicated states exist, take precautions to avoid
unpredictable results. For example, a tag is associated with an enumerated set defined
as follows.
| State Name |
State Value |
| 0 |
Open |
| 1 |
Close |
| 2 |
Close |
| 2 |
Open |
The server will return unpredictable results due to the State Name
duplication for an input of 2.
Note: You cannot assign an
enumerated set to an array tag.
Historian