PLC I/O
PLC input / output
A controller interface point connecting field signals to an identified module channel.
Schematic
Symbols · TS NO
Temperature switch NO
A temperature-operated NO switch changes from open to closed under its specified actuation condition.
Schematic · TS NO
What it represents
A temperature-operated NO switch changes from open to closed under its specified actuation condition. The drawing must identify the sensed location and temperature direction.
How to read it
- Do not assume a normally-open contact always means rising-temperature alarm.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- Name sensed location
- State operating temperature and direction
- Reference reset behaviour
A distinction that matters
A temperature switch provides a discrete contact state; an RTD provides a resistance measurement.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Pressure and temperature switches
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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