Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 89)

HMI-6200 Operator Interface
6-23
Class Tags
Loop tags – PV, SP, Out, Mode – are defined in a tag format called “classes”. This permits a high
degree of encapsulation. When a class-type tag is created, it does not contain a single value, but a set of
values associated with the loop. When a new loop is created, it is recommended to follow the pre-
defined class type definition.
Database Exercise
In the development computer Workspace window, select the Database tab. Click the Application Tags
folder to expand it and double-click the Datasheet View line to open the database worksheet.
Note that the database was updated during the development (tags appear as they are created and empty
spaces are present as a result of deletions).
For this database exercise example, we add/define a discharge temperature tag and associated alarm
tags. We need to configure the Application Datasheet as follows (in order to fill in the field, click on
the field after the last defined tag and type the data).
On line # 64…
Name: type
Td_a; Array Size: type 3 (four stage compressor, 0-3); Type: click ▼ and select Real; Description: type
Td Absolute (Deg R or K); Web Data: click ▼ and select Local or Server.
On line # 65…
Name: type
Td_FB; Array Size: type 3; Type: click ▼ and select Boolean; Description: type FALLBACK Disch
Temp; Web Data: click ▼ and select Local or Server.
Repeat the data entry on line # 66 as shown below, to define the high temp alarm.
We have created an additional analog input with High and FB alarms; now expand the Tag List folder to
verify the database addition you have created. Note that during the screen development, when you type
in a nonexistent tag, Web Studio will prompt you to check if you desire to create a new tag (if you
accept, it will create a window which permits to create the tag).
FIGURE 6-18
Workspace Window
Database Tab
selection of
Application Tags
FIGURE 6-19
Application
Datasheet
Analog Input
configuration