Diagrams User Guide
Diagrams : Piping & Instrumentation Diagrams (P&IDs) : Instrumentation : Instrumentation Loop Options
Instrumentation Loop Options
Items like actuators, offline instruments, inline components and tubes have an attribute called Schematic Loop Reference (SCLORE). Elements with this attribute can be assigned to any SCLOOP element.
This is done by changing the value in the Shape Data window, item list or by using the dialogue available from the Home Tab > P&ID > Instrument menu and context menu.
There is an intelligent mechanism helping to keep connected elements in the same SCLOOP. When something is connected to an item that is a part of a control system and it has SCLOOP set already, the propagation mechanism will automatically set the SCLORE attribute to newly connected items. Moreover, if the SCLORE attribute is changed, the new value will be propagated to all connected items that have SCLORE unset or have previous SCLORE value set.
Note:
The Propagation mechanism does not support multiple SCLOOPs. If the previous value was multiple SCLOOP the propagation will not continue after the change. Additionally, propagation will stop on elements when:
•
The item has SCLORE already set.
•
The item is not an instrument/process line member or equipment or sub-equipment.
•
The item has multiple SCLORE set.
All items propagated will be displayed in the System Message Log.
Propagation behaviour can be defined via Diagrams Options.
There is an option called ‘Ask user for loop reference when connecting instrument loop’. When the instrument item is connected to another item that does not have SCLORE set, the system will automatically ask for SCLOOP.6
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