PLC I/O
PLC input / output
A controller interface point connecting field signals to an identified module channel.
Schematic
Symbols · DO TRANS
PLC transistor output
A PLC transistor output switches a documented electronic path for a field load.
Schematic · DO TRANS
What it represents
A PLC transistor output switches a documented electronic path for a field load. Output polarity, common connections and load protection follow the selected module wiring instructions.
How to read it
- Check output sourcing or sinking behaviour before connecting the actuator.
- 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
- Identify channel and common
- State output polarity
- Reference load and protection requirements
A distinction that matters
A transistor output differs from an isolated mechanical relay contact.
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 digital 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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