RED-LINE

Mark up drawings and test changes on screen. This is one long page: the how-to, then the drawings (Sheet 1 and Sheet 2), then the SIM at the bottom.

How to use

  1. Pick a colour in the dark bar. Red means new work.
  2. Pick the pen ✎ on the left, then draw on a drawing with your mouse or finger.
  3. To move a mark, pick ✥ and drag it. To rub one out, pick ⌫ and tap it. ↶ Undo takes back your last step.
  4. Press Save to keep your marks. They stay in this browser only. Nothing is sent anywhere.
  5. Scroll the page with your mouse wheel. On a phone, pick the hand ✋ first, then swipe to scroll.
  6. Press ▶ SIM to jump down to the working circuit. Press the buttons on it and watch it respond.
  7. Reset demo clears your marks and starts fresh.

Start marking up ↓

RED-LINE demo · your marks stay in this browser onlyHow to use▶ SIM
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▶ SIM
━ Red line = New · ⩘⩘ Zig-zag = Remove · █ Red highlight = Concern / verify · ■ Green = Retained · ■ Black = Existing · ✓ Green tick = Good · ◯➜ Purple circle + arrow = move device · ● Dot = Terminal / junction · ⌒ Hop = Wires cross, not connected · ⚡ Symbols = RDH library devices (pen colour) · ⩘ REMOVE LINE n = remove that line · ┅ NEW LINE ➜ = insert a line (renumber to suit)
RED-LINE Sim demo · ▲ Back to the drawings
RED-LINE Sim Sheet 1Sheet 2SIM LOC/AUTO

How to use: this drawing works like the real thing. Click the E-STOP button to stop or release. Switch between LOC and AUTO at the top. Press and hold PUSH START on Sheet 2 to start the motor, and PUSH STOP to stop it. Green glow shows where power is flowing. Reset puts everything back. (Extra: 🔗 BRIDGE drops a test wire you can drag onto the drawing.)

Sheet 1 – AUTO/LOCAL

Sheet 1

Sheet 2 – Contactor

Sheet 2