Wiring Rules Overview

AVEVA Instrumentation uses 'Wiring Rules' to auto 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 Wiring Manager.

For how to apply a Wiring Rule refer to Create Loop Wiring using Wiring Rules.

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

• Terminal Arrangement - number of terminals, their markings, sequence.

• Default wire numbers to be used on wire terminations.

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

• Default Cable Number, based on the instruments tag number fields from Instrument Engineer.

• Default Wire terminations at field device - 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 you to:

• Change the default Cable Number created by the Wiring Rule.

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

After accepting defaults (or making changes as required) the Field Device and terminals are created, cable 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:

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

2. 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.

3. Edit the cable details/type (using the AVEVA Instrumentation Cable Schedule user interface).

4. Edit terminations (using the AVEVA Instrumentation Terminations editing user interface).

   Note: Equipment Terminations can also be accessed directly from Designer. Refer to Equipment Data for details.