PLC I/O
PLC input / output
A controller interface point connecting field signals to an identified module channel.
Schematic
Symbols · EN
Power-rail enable interface
In plain English
What does Power-rail enable interface mean?
An enable interface requests a selected power supply or switched rail to operate.
A simple example
A sequencer can drive the enable input of a regulator while separately monitoring its status.
What the drawings help you do
Draw enable as a command entering the regulator or switch, and show the resulting supply output separately. If status is returned, label that connection independently. This prevents the command to operate from being mistaken for confirmation that the power rail is healthy.
- Command
- A request for a device to take an action.
- Power-good
- An indication of the generating device’s specified acceptable-supply conditions.
Before using this reference
- Identify the device receiving enable.
- State the enable signal’s active condition.
- Show the separate supply output and status feedback if used.
Is enable the same as power-good?
No. Enable requests operation; power-good reports a specified condition. A circuit can assert enable while the supply is still starting or while a fault prevents it reaching the required state.
Read the source: Power supply sequencing
Schematic · EN
A distinction that matters
Enable is a command input; power-good is a condition output.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Power supply sequencing
Power supply sequencing: public technical context for the named function. Product and compliance details remain with the publisher.
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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