Industrial Engineer · phase 4 of 16 · noun
Move / Copy
Instructions that transfer a value or block of data without changing the source.
The Explain card
- Plain English
- A move puts one value into another tag, and a copy moves a whole block of memory from one place to another. The source stays as it was.
- Example
- A move writes the recipe's setpoint into the PID's setpoint tag when the operator confirms. A copy loads a whole recipe structure into the active recipe in one instruction.
- Why it matters
- A move on a rung that is always true overwrites the destination every scan, so an HMI entry into that tag lasts for one scan. A copy with a wrong length walks past the destination and rewrites whatever sits after it in memory.
- Hook
- Fast, silent, and happy to overwrite.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
A Move instruction writes the scaled speed reference from an integer register to the VFD command tag before the drive is enabled.
How it is built
- move free base change position or cause action
Where it came from
- Origin
- Middle English move, derived from the verb moven, from Anglo-French mover and ultimately Latin movēre
- Entered the language
- 15th century
- What changed
- The noun first named an act or change of position, later a deliberate step or turn, and eventually an instruction name in computing and controls.
How it is spelled
- Pattern
- The word keeps a silent final e after v, following the English convention that words rarely end in bare v.
- Breaks the pattern
- The o has the /uː/ sound rather than the /oʊ/ sound often associated with a consonant followed by final e.
Spelled like
- prove
- love
- give
Broken into chunks
-
move
- movement
- remove
- movable
Where it sits in the deck
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.
