How To
See AlsoSee AlsoPurpose
This combination allows you to let a table object inherit the alarm limits of an analog object. You can then create a table object containing up to ten process values which all share the same alarm limits. The ten process components must share the same ranges. By using this combination, you can thus save the number of objects used in the configuration.
How it works
First, an analog object is defined. The measuring range and alarm limits of that object will be shared by the entries in the table object that we connect it to.
Then the properties dialog box for the table object is opened and the name of the analog object is selected in the Connect To drop-down list on the Data Management Definitions tab. On the Table tab, we can specify up to ten entries.
Now, an alarm will occur if any of the values in the table object exceeds one of the alarm limits.
Example
Assume that you have four temperature gauges, T1 to T4, that monitor the temperature at different locations in a tank. They share the same measuring ranges and alarm limits.
You can then create the first temperature gauge, T1, and specify the appropriate properties. As the next step, you create the table object, Temperature, that will hold all temperature gauges, T1 to T4.
On the Data Management Definitions tab of the Temp properties dialog box, you select T1 in the Connect To drop-down list.
You can then define the remaining three temperature gauges on the Table tab and they will all share the same ranges and alarm limits.