PLC I/O
PLC input / output
A controller interface point connecting field signals to an identified module channel.
Schematic
Symbols · AI
PLC analog input
A PLC analog input measures a documented voltage, current or sensor quantity.
Schematic · AI
What it represents
A PLC analog input measures a documented voltage, current or sensor quantity. Its signal range, common and any shield/earth connection require explicit wiring information.
How to read it
- Identify the selected channel mode before interpreting its terminals.
- 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
- State signal type/range
- Show signal common and shield
- Reference channel configuration
A distinction that matters
Analog measurement carries a range of values; a digital input reads a discrete state.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Modicon TM3 analog I/O hardware guide
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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