Industrial Engineer · phase 4 of 16 · noun

Alias Tag

Alternate tag name that references another tag or hardware-defined point.

The Explain card

Plain English: An alias is a second name that points at an existing tag or a hardware point. Reading or writing the alias reads or writes the thing behind it.
Example: The physical input in slot 2, point 5 has an ugly hardware name. An alias called Hopper_Empty points at it, and the program uses the readable name everywhere.
Why it matters: Aliases let the wiring change without editing the logic. Move the sensor to a different card, repoint one alias, and every rung that used Hopper_Empty follows without being touched.
Hook: A nickname for a wire.

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

In Studio 5000, the programmer creates the Alias Tag Start_PB for the input wired to the motor start pushbutton.

Why these words

alias Latin alias, otherwise marks the tag as a second naming layer
tag Middle English tagge, a hanging label or point names the controller item being identified

Where it came from

Origin: English technical compound from alias, from Latin alias, and tag, from Middle English tagge
Entered the language: 1990s
What changed: Alias shifted from an adverb meaning otherwise to a noun for another name, while tag shifted from a physical label to a software identifier.

How it is spelled

Pattern: It is written as an open compound with two separate words.
Pattern: Alias keeps its final s even though the word is singular.
Breaks the pattern: The final s in alias is part of the word, not a plural suffix.

Spelled like

Broken into chunks

What it sits beside

Same subject

Same shape

Logix tag relationships

Logix tag scopes

Phase 4: PLC Memory, Tags, and Instructions

The data a program moves and the instructions that move it, from a single true or false value up to a structured array.