Many Eagle data groups include a notable property setting on the Data Group Properties dialog box that enables an ordinalized data group to be associated with a different process type instance number. The setting is called Process Type Instance.
Click the following image to see an example Data Group Properties dialog box:
By default, the process type instance number assigned to a data group is the same as the data group's ordinal number. (If you leave the Process Type Instance field blank, you accept the default.) However, it might be the case that the data group ordinal number and the process type instance number are different. You may override the default by entering a valid process type instance number in the Process Type Instance field. To find the process type instance, see the "Process Configuration" data group.
Example
Imagine that a given field device is configured to have process numbers 5, 6, and 7 loaded with process type 45 (Alarm) on each of them. Perhaps that's a station configuration used by your organization and deployed on numerous field devices. It might be the case that you only care to get alarm data from one of these process numbers. Your single "Alarm" data group could have an ordinal of 1. The alarm process types are instances 1, 2, and 3. You want your "Alarm" data group to get its data from instance 3, so you set the "Alarm" data group Process Type Instance value to 3. Now "Alarm" ordinal 1 gets its data from process type instance 3.
For more information, see Data Groups.
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