Industrial Engineer · phase 6 of 16 · noun
Minor Fault / Warning
Diagnostic condition recorded by the controller that may allow logic execution to continue.
The Explain card
- Plain English
- A minor fault is a problem the controller records and then keeps running through. It shows in the fault log and often on a status bit, and the logic carries on.
- Example
- A periodic task overlaps itself once during a heavy scan. The controller logs a minor fault and finishes the pass, and nobody notices until someone reads the log.
- Why it matters
- Minor faults are the early warnings that something is close to a limit. A log full of them means a task period, a watchdog or a math instruction is about to become a major fault on a busier day.
- Hook
- The controller clearing its throat.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
During commissioning, the technician reads the Minor Fault code in the PLC diagnostics before checking the affected analog input channel.
Why these words
- minor Latin minor, smaller or lesser modifies fault by assigning it a lower severity grade
- fault Old French faute, lack or failing, related to Latin fallere provides the head noun for the recorded diagnostic
Where it came from
- Origin
- English technical phrase combining Latin-derived minor with Old French-derived fault
- Entered the language
- 20th century
- What changed
- Minor developed from a general comparison of size or rank into a severity label, while fault shifted from blame or deficiency to an abnormal equipment or software condition.
How it is spelled
- Pattern
- minor keeps the Latin-derived final -or also found in major and prior
- Pattern
- fault keeps the -ault spelling found in several French-derived English words
- Breaks the pattern
- The l in fault is not pronounced as a separate consonant in standard English.
Spelled like
- major
- prior
- default
- assault
Broken into chunks
-
min
- minimum
- minus
-
fault
- faulty
- faultless
What it sits beside
Same subject
- Major Fault
- Warning
- fault code
- controller diagnostics
- fault handler
Same shape
- major fault
- ground fault
- hardware fault
controller diagnostic severity labels
- Minor Fault
- Major Fault
- Warning
PLC diagnostic record fields
- fault code
- timestamp
- module address
Where it sits in the deck
Phase 6: PLC Operating Modes, Safety, and Diagnostics
Run, program and fault: what a controller does when something goes wrong, and the safety functions that decide how much that costs.
