Instrument and Loop Wiring

AVEVA Instrumentation uses 'Wiring Rules' to automatically generate typical field instrument wiring/cabling. Using the Wiring Rules features can save many hours otherwise required to build devices and their associated terminal arrangements, cables, terminations, etc. in Instrument Wiring Manager.

For further information on how to apply Wiring Rules, refer to Instrument Wiring and Loop Wiring.

When a Wiring Rule is applied to a field instrument, the following are defined:

• Terminal arrangements - the number of terminals, their markings, sequence.

• Default wire numbers to be used on wire terminations.

• Default cable types - type of cable (individual cores, pairs or triad etc.), whether shielded/screened, and whether armoured, etc.

• Default cable numbers - based of the instruments tag number fields from Instrumentation Engineer.

• Default wire terminations at the field devices - how the cable is connected to the field device terminals (core 1 to terminal 1, core 2 to terminal 2, etc.).

• Default wire terminations at non-field device - how the cable is connected at the other end.

When wiring based on a Wiring Rule is created, AVEVA Instrumentation creates all the above automatically. Prior to saving this data, AVEVA Instrumentation also enables Users to:

• Change the default cable number created by the Wiring Rule.

• Select equipment the cable will terminate to at the other end (from a list of Junction Boxes, Cabinets, etc.).

After accepting defaults (or making changes as required) the Field Device and terminals are created, the cable is created and terminated at both ends (if equipment has been selected at the other end). At the other end, AVEVA Instrumentation always uses the next available spare terminals.

At any time after a Wiring Rule is applied, the data that has been generated can be edited by:

• Re-running the Create Wiring command using same Wiring Rule - this enables Users to reassign a Cable No, reassign a Junction Box, etc.

• Re-running the Create Wiring command using a new Wiring Rule - this updates terminal arrangements, cable type, terminations and enables Users to reassign a Cable No, reassign a Junction Box, etc.

• Edit the cable details/type using Instrument Wiring Manager Cable Schedule user interface.

• Edit terminations using Instrument Wiring Manager Equipment Terminations user interface.