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Drawing the schematic
The control circuit is the heart of a UnifCAD project — this is where components are placed, wired and numbered.
The schematic is where you build the control circuit: supply, protections, contactors, push buttons, sensors, motors, drives and PLCs. Everything the simulation does later is decided here.
Wiring
Click, click, done — the two ways to draw a wire, corners, branches and reshaping a run.
Why a connection is refused
The three rejection messages, what can connect to what, and how terminal numbers work.
Wire colours
Colour schemes, standards, per-run overrides, and what the colours mean while the circuit is live.
The order that works
Place the supply first
Start with the source and its protection. The whole sheet takes its identity from what feeds it: a 24 V DC control circuit and a 400 V AC power circuit behave differently, and UnifCAD will refuse to join them later.
Place the components, then wire
Drop everything you need on the sheet before you start wiring. Moving a component afterwards drags its wires with it, but a sheet wired too early is a sheet you rearrange twice.
Give every device a tag
-KM1, -S1, -LSH01. The tag is what makes a coil and its contacts the same
device, and what couples the schematic to the PLC program and to the 3D plant.
A device designation needs a number
Write -KM1, not -KM. UnifCAD groups a device's blocks by the tag, so two
push buttons sharing a tag are treated as the same device and operate together.
Simulate early and often
Do not wait until the sheet is finished. Press Simulate, press the button, see what lights up. A circuit tested in pieces is a circuit you can still fix.