Industrial Engineer · phase 3 of 16 · noun

Online Edit

Program change made while the controller remains connected and, where supported, continues running.

The Explain card

Plain English: An online edit changes the program while the controller stays connected and, on most platforms, keeps running. The edit is tested on the live machine and then accepted or cancelled.
Example: A timer preset is too short and parts jam. The engineer changes the value online, watches two cycles run clean, and assembles the edit into the running program.
Why it matters: Production keeps running, which is why the plant loves it. The same edit that fixes a jam can also start a motor the moment it is accepted, so know what the rung will do before you finalize it.
Hook: Surgery on a patient who is still working.

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

In a sentence

The technician used an Online Edit to add a motor permissive while monitoring the PLC in Run mode.

Why these words

online English on plus line places the operation within an active controller connection
edit Latin editus, brought forth or published names the revision operation

Where it came from

Origin: English computing compound formed from online and edit
Entered the language: late 20th century
What changed: Online shifted from being situated on a line to electronic connection, while edit expanded from publishing work to changes in software and controller programs.

How it is spelled

Spelled like

Broken into chunks

What it sits beside

Same subject

Same shape

PLC program change workflows

controller operating modes

Phase 3: PLC Program Organization and Execution

How the logic is arranged and how the scan actually runs it, which is the difference between code that works and code that works every time.