Signal Numbers

A Signal Number originates at a terminal. All wires connected to that terminal or wires connected to wires connected to that terminal inherit the same Signal Number.

In the above example, a Signal Number (red) has been attached to the field Device's first terminal (+). Consequently as a wire (or cable core) is connected to that terminal, the Signal Number is 'inherited' along all wires that are connected together in the circuit. Hence all the wires marked with the blue arrows have their signal numbers generated from the single Signal at field device terminal + (red arrow).

Furthermore, if the Signal at the originating terminal is changed (that is, the Signal Number is changed) then all Signal Numbers for all interconnected wires will also automatically change to the new Signal Number.

This Signal Numbering system is the most commonly used in the industry and is the easiest to apply with Wiring Manager. By default, Wiring Manager shows Signal Numbers in the Terminations window (see Terminations User Interface) since its more likely you are working with specific signals than Ferrule Numbers (see below).

When a field device is created using Wiring Rules (see Using Wiring Rules), Wiring Manager will automatically create each Signal Number at each field device terminal based on the Signal Number rule set for the applied Wiring Rule. Signal Numbers can also be manually created and/or edited from the Terminations window.