Industrial Engineer · phase 2 of 16 · noun
Wet Contact
Contact or output that supplies a voltage when active.
The Explain card
- Plain English
- A wet contact delivers a voltage when it closes. The signal source supplies the power along with the on or off state.
- Example
- A drive's fault relay is wired so its contact sends 24 V from the drive's own supply to the PLC input. The PLC card sees voltage arrive rather than supplying it.
- Why it matters
- A wet signal needs an input card that expects to receive voltage, and the two supplies need a shared common or the input floats. Mixing wet outputs with dry inputs is how two power supplies end up fighting.
- Hook
- Wet means it arrives already carrying power.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
Before wiring the PLC input, verify that the wet contact voltage and polarity match the input module specifications.
Why these words
- wet Old English wæt, moist modifies contact through an electrical engineering contrast with dry
- contact Latin contactus, touching names the connection or switching element
Where it came from
- Origin
- English electrical engineering compound formed from wet and contact
- Entered the language
- 20th century
- What changed
- Wet broadened from physical moisture to an energized electrical condition, while contact narrowed from general touching to a circuit connection.
How it is spelled
- Pattern
- open adjective-plus-noun compound
- Pattern
- wet doubles its final t before vowel suffixes in wetter, wettest, and wetting
Spelled like
- dry contact
- auxiliary contact
- wetting current
- wetted contact
Broken into chunks
-
wet
- wetter
- wetting
- wetted
-
contact
- contactor
- contacting
- contact block
What it sits beside
Same subject
- dry contact
- digital input
- sourcing output
- sinking output
- relay output
Same shape
- dry contact
- auxiliary contact
- normally open contact
- normally closed contact
contact signal terms
- wet contact
- dry contact
PLC output types
- relay output
- transistor output
- triac output
Where it sits in the deck
Phase 2: PLC I/O and Field Signals
Where the controller meets the machine: discrete and analog signals, the wiring conventions behind them, and the field devices that send them.
