Label General Instruments - Use Instrument Pattern Labels

The "patterns" facility is used to nominate an instrument record, displayed on a drawing, to act as a representative for further instrument records, which are not displayed, but will be exported on output along with the displayed item.

A simple example of this is a Flow Indicator (FI) which could consist of the displayed Flow Indicator (FI) itself, which also represents a Flow Transmitter (FT) and a Flow Element (FE).

The AVEVA P&ID Item Type for a pattern label is XPR. It is a good idea to configure all pattern labels to be a set colour, in the Item Types - Standard Sub-Category of the AVEVA P&ID Project Administration program. All users will then instantly recognize pattern labels on drawings that other users have worked on.

Details of patterns are edited using the Instruments - Patterns Sub-Category of the AVEVA P&ID Project Administration program.

The instrument which has been physically drawn on the drawing is known as the substitute item in the pattern; it is expanded on output into all its components which are detailed in this pattern. An extra field is present in the output files. It is called Pattern Item and has an * (asterisk) in it if the item has been defined as a pattern item.

To use the pattern facility, the pattern reference number is allocated when labelling any instrument (including remote and instrument valves) using the Instrument Balloon Properties Dialogs. Refer to Label General Instruments.

A pattern can only be created for instruments with the same tag/loop number. This is because the tag/loop number is inherited from the substitute item. Suffixes must be used correctly to distinguish between identically labelled instruments. The Loop Number is read from the drawing and if no loop number has been assigned, a dummy tag, e.g., [234]34, will be exported. The grid reference for all pattern items is the same as for the substitute item.

All data is validated on output for the pattern items as if they had been drawn on the drawing.