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Sign inStart drawing

Getting started

Open the app. It loads with an example: a self-holding contactor circuit. You can draw straight away — no account is needed for drawing and simulation.

The workspace

  • Symbol column (left): one icon per group — supply, protection, operators, analog, sensors, relays and timers, contacts, signalling, terminals, transformers, meters, loads, PLC. Click a group to open its symbols.
  • Toolbar (top): new, open, save, PDF, PNG, simulation, undo/redo, copy/paste, flip, delete, design check, and the drawing tools — line, polyline, rectangle, ellipse, text, table, image.
  • Properties panel (right): the designation, comment and all electrical properties of the selected device.
  • Settings (gear, top right): language, grid, terminal style, symbol and background colours, Ladder colours.

Placing symbols

  1. Click a group in the symbol column and then a symbol. The symbol follows the pointer.
  2. Click on the sheet to place it. Esc or right-click cancels.
  3. Rotate with R or from the properties panel; mirror with the flip buttons. Text inside symbols always stays readable.
  4. Move a symbol by dragging its body. Select several with Shift+click or a rubber band on empty space.
Each new device gets a designation automatically (F1, Q1, K1, S1, M1…). Auxiliary contacts of a contactor take the contactor's name: a contact named K1 follows the coil K1.

Wiring

  • Press on a terminal and drag to another terminal to draw a wire. Wires are routed orthogonally; drag a corner handle to adjust them.
  • Terminals that touch each other connect without a wire.
  • Supplies with the same name are electrically connected, so you can place L1 at several points of the sheet.
  • Wire colour follows the potential (brown L1, black L2, grey L3, blue N, green-yellow PE, red L+, dark blue M, orange analog). You can override it in the wire properties.

Your first simulation

  1. Press the green play button or F5.
  2. Click push buttons, switches, breakers and sensors to operate them. Energised parts are highlighted; lamps light, motors turn.
  3. Use the floating bar to pause, change speed (×1, ×10, ×60) and reset the clock. Timers follow the simulation clock.
  4. Press stop (or F5) to return to editing.

Next: build a self-holding circuit step by step, or read about the symbol library.