Assign Tags to Loops

Instruments tags may assigned to loops either from Loop List facilities, or from the Instrument List. Refer to Assign Instrument Tags to Loops for details of the Instrument List facility.

Note: It is not mandatory for each tag to be assigned to a loop. For example, simple field pressure gauges or a pressure relief valves are not normally members of a control loop. They are stand-alone instruments.

To assign a tags to a Loop from the Loop List:

1. In the Edit Loop window (or from the Add Loop window if creating a new loop), click the Add Tag button to display the following window:

   

   The left-hand list shows typical tags and descriptions from the Instrument Engineer ISA tag Catalog and built using the current loop Function prefix.

   The right-hand list shows all tags assigned to the current loop (if any).

2. To assign a tag to the current loop, three methods may be used:

   1. Create a new tag number using the ISA tag Catalog (left list).

      Double-click on the required Catalog option. A tag number is then automatically generated from the selected function, area and loop number, and is added to the Tags Assigned list.

   2. Create a new tag number by clicking the New Tag button. The Instrument Tag window is then displayed. This window is used to specify the tag of the new instrument. Unlike the first method, you can specify the parts of the new tag number themselves.

      The new tag number is added to the Tags Assigned list.

      For details of the Instrument Tag window, refer to Manually Add a Tag to the Instrument List.

   3. Pick an existing tag number from the Instrument List.

      Click the From Instrument List button, which displays a window which you can use to Select Existing Tags not assigned to any loop.

      Selected tags are added to the Tags Assigned list.

3. To remove a tag from the Tags Assigned list, double-click on it.