Industrial Engineer · phase 3 of 16 · noun

Continuous / Cyclic Task

Task that runs repeatedly whenever higher-priority work and system overhead permit.

The Explain card

Plain English: A continuous task runs the moment it finishes, over and over, as fast as the controller can go once higher priority work is done. It has no fixed period, only a scan time that floats.
Example: The default task on most controllers is continuous. All the machine logic sits in it, and its scan time drifts between 5 and 12 milliseconds depending on what else is happening.
Why it matters: Anything that needs a known rate cannot live here, because the rate changes with load. It is the right place for the bulk of the logic and the wrong place for anything timed by counting scans.
Hook: Runs whenever nothing more important is running.

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

In a sentence

The Continuous task reads the conveyor photoeye, executes interlock logic, and updates the motor starter output during each PLC scan.

How it is built

Where it came from

Origin: Latin continuus, from continere, meaning to hold together
Entered the language: 17th century
What changed: The sense moved from physical joining to unbroken sequence, mathematical continuity, and later a PLC task-class label.

How it is spelled

Pattern: The final silent e of continue is dropped before -ous: continue plus -ous becomes continuous.
Pattern: The adjective-forming suffix is spelled -ous, not -us.
Breaks the pattern: The ending -uous contains three consecutive vowel letters, although pronunciation compresses them into fewer vowel sounds.

Spelled like

Broken into chunks

What it sits beside

Same subject

Same shape

PLC task types

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.