(1) understanding PLC
Record using the PLC model, input and output points, observe hosts Panel structure and the connections between PLC and PC machines.
(2) power on (turn on the PC and PLC) and create a new project.
² using the menu command “file“ → “new“ or new item shortcut buttons.
(3) inspect the operation STEP7-Micro/WIN PLC and PC connection, setting and reading PLC model.
² the menu command, “PLC” → “type“ → “read PLC“ or in the command tree → “project“ name → “type“ → “read the PLC.“
(4) instruction set and select Edit.
² the menu command “Tools“ → “options“ → “General“ tab → “programming mode“ → choose SIMATIC
² using the menu command “view“ → “LAD”. Command or menu “Tools“ → “options“ → “General“ tab → “default editor“.
(5) input, editing, as shown in Figure 3-29 the ladder diagram, and convert it into statement form instructions.
(6) the title to the ladder and POU comment, network, network notes.
(7) the symbol table, And select the operand appears in the form of: symbol and address displayed.
² establish a symbol table: click Browse in the “symbol“ button.
² symbol and address display: “Tools“ → “options“ → “program editor“.
(8) the compiler. And observe the compiled results, if error, modify, until the compilation succeeds.
² “PLC” → “compile“, “compile all“ or use the shortcut button.
(9) download the program to the PLC. Before you download, PLC must be in the “stop“ way of working. If the PLC is not in the “stop“, in the toolbar, click the “stop“ button, the PLC as far as stop.
• In the toolbar, click the “Download“ button, or use the menu command “file“ → “downloads“. Appears “Download“ dialog box. You can choose whether to download the “code block“, “block“ and “CPU configuration“, click “OK“ to begin downloading the program.
(10) State chart monitors the status of each component
² program part of the code is selected, click the right mouse button pop-up menu → → “State.“
(11) to run the program
(12) the starting State chart
(13) the input force operations
For operation without load, so use force simulates the physical conditions. I0.0 is forced ON, in the new value column enter corresponding I0.0 1, I0.1 is forced OFF, in the new value column enter corresponding I0.1 0. Then, in the toolbar, click “force“ button.
(14) in the ladder diagram programs shown in the running state
• Click “program status on/off“ button
or menu command “debug“ → “program status“ displays the status of each element in the ladder diagram.
or menu command “debug“ → “program status“ displays the status of each element in the ladder diagram.3. results
(1) carefully observe the PLC input/output indicator on the base unit, and records.
(2) summary of ladder diagram input and modification of operating procedures.
(3) write a ladder diagram process of adding comments.
PLC ONE 