Electrical panel design: drawings an electrician can wire from

• With a free PLC program. Send your machine's sequence and I/O list, and the schematic is drawn from it — power and control circuits, PLC I/O wiring and the terminal list — free, with the program. Free PLC program from your sequence.
• A full panel design. For a new machine, a retrofit or a panel your own team will build: everything in the table above, at a fixed price.
• A machine that has no drawings. The panel exists and the paper does not. That is as-built work, traced from the real panel: machine documentation.

• The I/O list, or the machine's sequence if the I/O list does not exist yet.
• Motors and other loads, with their ratings from the nameplates or the datasheets.
• The supply at the machine: voltage, phases and earthing.
• The PLC, HMI and drive makes your plant standardises on, if it has a standard.
• Where the panel goes, and the largest size it may be.
• Safety devices: emergency stops, guard switches, light curtain, two-hand start.
• Your drawing standard, if you have one: title block, wire numbering, device tags.

1. STEP 01
   Inputs
   The list above. Whatever is missing we ask for before starting.
2. STEP 02
   Concept
   Single-line diagram, load list and the main components, sent for your agreement before the detail starts.
3. STEP 03
   Schematics
   Power, control and PLC I/O sheets, with wire numbers and device tags.
4. STEP 04
   Layout and BOM
   Panel layout with dimensions, schedules and the bill of material.
5. STEP 05
   Review
   Your team reads the set and marks it up. Changes go in before issue, not after the panel is wired.
6. STEP 06
   Issue
   Native project, PDF and Excel schedules. After commissioning, the set is corrected to as-built from the mark-ups.

A drawing is read most often by a maintenance engineer with the machine stopped. These rules are for that reader:

• One name everywhere. A device carries the same tag on the drawing, on its label in the panel and in the PLC program.
• Every wire numbered. The number on the sheet is the number on the ferrule.
• Cross-references on every sheet. A contact shows where its coil is drawn, and a wire that leaves a sheet says where it arrives.
• The safety circuit is hard-wired. Emergency stop and guards work in hardware and are drawn on their own sheets. The PLC reads their state; it is not the safety function.
• Spares are shown. Spare PLC points and spare terminals are on the drawing, so the next change starts from a known place.

The same drawings go with every machine we build and with every PLC program and HMI we write, because the three are one piece of work: the tag on the drawing is the tag in the program and the tag on the screen.