MP STUDIO 2 Phase 3 · Ladder Editing

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This page describes how to place contacts, coils and wires on the ladder canvas and enter their addresses, how to edit and move rungs, and how to use find and replace and the navigation features.

Select a cell, then press a function key or a symbol rail button to place a symbol in that cell.

In Figure 1, the first rung is P0 (NO) → rising edge (P) → P1 (NC) → NOT → P32 coil, the second rung is P2 → falling edge (N) → SET M0, and the third rung is P3 → RESET M0.

Coils (F7, F8 and F9) are always placed at the right end of the row, and the empty cells between the preceding symbol and the coil are filled with horizontal lines automatically. You cannot place a symbol on top of a function block.

1. Select a contact or coil cell and press Enter or double-click it.
2. In ① Address of the Edit Contact (or Edit Coil) window, enter an address such as P0, M10 or T0.
3. If needed, also enter ② Symbol and ③ Comment, then click OK. The symbol and comment you enter are registered as the symbol of that address and are also shown on other cells that use the same address.

• If you start typing on a cell, the input window opens with what you typed already filled in.
• If you type an address on an empty cell, the Insert Contact (NO) window opens, and clicking OK places an NO contact with that address.
• Press Shift+Enter to edit the address of the selected cell directly in the symbol table.

The address system is described in Phase 5 · Memory and Symbols.

Contacts placed one after another in the same row form a series (AND) condition. Joining a contact in the row below to the row above with a vertical line forms a parallel (OR) condition.

1. In row 1, place a P0 NO contact and a P32 output coil.
2. In the first cell of row 2, place a P1 NO contact.
3. Select the first cell of row 1 (P0) and press F6 to draw a vertical line down to the row below.

The vertical line is drawn at the right edge of the cell. You cannot draw a vertical line in the last column of a row or after a coil.

To keep the output ON even after the start input was ON only briefly, put a contact of the output itself in parallel.

• ① P0 (NO): start input
• ② P32 (NO): the self-holding contact of the output (in parallel with P0 through the vertical line)
• ③ P1 (NC): stop input. When it turns ON, power is cut.
• ④ P32 (output coil): output

A SET coil turns its address ON and keeps it ON once the condition has been ON, and a RESET coil turns that address back OFF. Use SET and RESET for the same address as a pair.

A rising edge (F11) passes power for one scan at the moment the preceding condition goes from OFF to ON, and a falling edge (F12) at the moment it goes from ON to OFF. Use them for actions that must run only once, such as a circuit that increases a value by one each time a button is pressed. Put the edge directly after the contact whose change you want to catch (for example P2).

The name of an edge cell is the bit that remembers the previous state. If you leave the name empty, an automatic name (#Edge…) is used. If you use an address that the device overwrites on every scan, such as an input (P) address, as the name, the cell turns red, so unless you have a specific reason, leave the name empty.

Select a horizontal line cell and press Enter to open the Write Text in Wire Cell window. Text starting with // becomes a note, and text in the form [name] becomes a bookmark. Press Ctrl+B to open the Insert Bookmark window, where you can insert a bookmark by entering just its name (leave the name empty to delete it).

Bookmarks are listed in the Mark list at the bottom of the Functions panel; click a line in the list to go to that row. You can show or hide the list with View → Bookmark List.

If you insert an empty row in the middle of a rung (between parallel branches), the rung is broken and cells may turn red. In that case, undo with Ctrl+Z.

• Drag with the mouse or Shift+arrow keys: select a rectangular area
• Shift+click: select the rectangle from the cursor to the clicked cell
• Ctrl+click: add or remove individual cells
• Click or drag the row numbers: select whole rows
• Ctrl+A (Edit → Select All): select the whole program
• Ctrl+arrow keys: move the selected cells in that direction

When a paste overwrites existing cells, a notice shows how many cells were overwritten. If that was not intended, undo with Ctrl+Z.

Press Alt+↑ or Alt+↓ (Edit → Move Rung Up / Move Rung Down) to swap the rung under the cursor with the rung above or below it. Empty rows between rungs stay where they are, and one Ctrl+Z undoes the move.

A bookmark row is swapped like a rung.

Right-click a cell or press Shift+F10 to open the cell menu.

The menu contains Download and Monitoring, Insert Function and Insert Bookmark, Undo and Redo, Cut, Copy, Paste and Delete, inserting and deleting lines and cells, and Text Search. On a cell with an address, Add to Watch (address) is shown at the bottom.

Press Ctrl+F or click the find box in the command bar to open the Text Search window.

1. In ① Address to find, enter the text to look for, such as P0 or M10.
2. Use ③ ↓ Next and ↑ Previous to move between matches. The position and number of matches (for example 1 / 3 matches) are shown, and ④ the matching cells are all highlighted on the canvas.
3. To replace, enter ② Replace with and click Replace or Replace All. If you leave Replace with empty, the matched text is deleted.

If Replace All for M1 would also change other addresses that only partly match, such as M10, a confirmation is shown. Replace Whole Addresses Only replaces only cells whose whole address matches, and Replace All Anyway also replaces the partly matching addresses. Cancel replaces nothing. Function blocks can be found by the beginning of their name, but cannot be replaced.

Moves made with the arrow keys or by clicking are not recorded in the Back and Forward history. Opening another project clears the history.

• Phase 4 · Functions
• Quick Reference · Shortcuts

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