Tag Detail Displays; Defining A Tag - Siemens SIMATIC PCS 7 OSx Operator's Manual

3.1

Tag Detail Displays

Defining a Tag

3-2
Tag Detail
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
the recipe area tags and the tags that represent the system nodes. In the
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
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 have sent the
•
SIMATIC PCS 7 OSx Process Configuration
command to the OSx station.
Scan_Off
SIMATIC PCS 7 OSx 4.1.2 Operator