Tag Detail3-2 SIMATIC PCS 7 OSx 4.1.2 Operator
3.1 Tag Detail Displays
A tag represents a block of data for an instrument or device associated with
the plant process. For example, a tag is the collection of data that represents
a timer, a motor, or a single I/O point. When OSx references a tag, the
system accesses all the information represented by the tag. A unique group
of numbers and/or letters identifies each tag.
The OSx tag types represent related data elements in the controller and
determine the specific characteristics of tagged data. OSx provides a
standard display format, called the tag detail, for all the tag types except
therecipeareatagsandthetagsthatrepresentthesystemnodes.Inthe
Operate state, the tag detail shows the attribute information associated
with a tag. The operator can display a tag detail and observe the current
values for the tag’s attributes.
Two typical tag details are described later in this chapter. For a complete
list of tag details, attributes and security privileges, see the chapter on
Viewing Tag Information in the SIMATIC PCS 7 O Sx Process Configuration
Manual.
Each tag type consists of a group of associated attributes. An attribute gives
the tag its specific characteristics. The value of an attribute determines both
its display features and its alarm conditions.
NOTE: A point on a tag detail may change to magenta, and the animation
may stop, under the following circumstances:
• The OSx station loses communication with the control node.
• You deactivate the scan for a tag from a tag detail display.
• A tag contains no points that are configured for network scan.
• The controller returns invalid floating point data for tag types with
floating point attributes.
• You have assigned the data to an invalid controller memory location
and OSx cannot collect the data.
• You h a v e s e n t th e
Scan_Off command to the OSx station.
Defining a Tag
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