s7netplus二次應用

1. 安裝

• 這是個基於S7協議的開源協議
  
  

2. 引用

using S7.Net;

3. 建立PLC物件

    internal class s7net_lib
    {
        //idenfy basic link params
        private string plc_ip;
        private CpuType plc_type;
        private short plc_rack, plc_slot;
        public Plc my_plc;

        //constructor，含參建構函式 
        public s7net_lib(int type, string ip, short rack, short slot)
        {
            switch (type)
            {
                case 0:
                    plc_type = CpuType.S7200;
                    break;
                case 1:
                    plc_type = CpuType.S7300;
                    break;
                case 2:
                    plc_type = CpuType.S7400;
                    break;
                case 3:
                    plc_type = CpuType.S71200;
                    break;
                case 4:
                    plc_type = CpuType.S71500;
                    break;
                default:
                    break;

            }
            plc_ip = ip;
            plc_rack = rack;
            plc_slot = slot;
            my_plc = new Plc(plc_type, plc_ip, plc_rack, plc_slot);
        }
    }

4. 連線

        //connect
        public bool connect_plc()
        {
            try
            {
                my_plc.Open();
            }
            catch
            {
                MessageBox.Show("plc can't be connected,check params!");
            }
            if (my_plc.IsConnected)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

5. 斷開連線

        //disconnected
        public bool disconnect_plc()
        {
            my_plc.Close();
            if (my_plc.IsConnected)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

6. PLC資料型別和定址型別

      //Analysis S7 data type
        private VarType S7_datatype(string type)
        {
            switch (type)
            {
                case "bool": return VarType.Bit;

                case "byte": return VarType.Byte;

                case "word": return VarType.Word;

                case "dword": return VarType.DWord;

                case "int": return VarType.Int;

                case "dint": return VarType.DInt;

                case "real": return VarType.Real;

                case "lreal": return VarType.LReal;

                case "string": return VarType.String;

                case "s7string": return VarType.S7String;

                case "s7wstring": return VarType.S7WString;

                case "datetime": return VarType.DateTime;

                case "timer": return VarType.Timer;

                case "datetimelong": return VarType.DateTimeLong;
                default:
                    return VarType.Byte;
            }
        }

        //Analysis S7 register type
        private DataType S7_registertype(int db_area)
        {
            switch (db_area)
            {
                case 129: return DataType.Input;

                case 130: return DataType.Output;

                case 131: return DataType.Memory;

                case 132: return DataType.DataBlock;

                case 29: return DataType.Timer;

                case 28: return DataType.Counter;
                default:
                    return DataType.DataBlock;
            }
        }

7. 讀寫資料

        //data write and read
        public object? write_read_value(string type, int db_area, int iDB_num, int iDB_start_byteadd, string w_or_r, object values, int bit_address = 0, int count = 1)
        {
            if (w_or_r == "w")
                if (type == "bool")
                {
                    my_plc.WriteBit(S7_registertype(db_area), iDB_num, iDB_start_byteadd, bit_address, (bool)values);
                }

                else
                {
                    my_plc.Write(S7_registertype(db_area), iDB_num, iDB_start_byteadd, values);
                }

            return my_plc.Read(S7_registertype(db_area), iDB_num, iDB_start_byteadd, S7_datatype(type), count);
        }

8. Int資料讀寫

        //int data write and read
        public short int_rw_value(int db_area, int iDB_num, int iDB_start_byteadd, string w_or_r, short values = 0)
        {
            short feedbackword = (short)write_read_value("int", db_area, iDB_num, iDB_start_byteadd, w_or_r, values);
            return feedbackword;
        }

9. byte資料讀寫

        //byte data write and read
        public byte byte_rw_value(int db_area, int iDB_num, int iDB_start_byteadd, string w_or_r, byte values = 0)
        {
            return (byte)write_read_value("byte", db_area, iDB_num, iDB_start_byteadd, w_or_r, values);
        }

10. 字串讀寫

        //string data 
        public string string_rw_value(int db_area, int iDB_num, int iDB_start_byteadd, string w_or_r, string values = "")
        {
            byte maxcount= new byte();
            string string_value;
            if (w_or_r == "r") { maxcount = byte_rw_value(db_area, iDB_num, iDB_start_byteadd + 1, "r"); }
            else if (w_or_r == "w") { maxcount = (byte)values.Length; byte_rw_value(db_area, iDB_num, iDB_start_byteadd + 1, "w", maxcount); }
            string_value = (string)write_read_value("string", db_area, iDB_num, iDB_start_byteadd + 2, w_or_r, values, 0,maxcount);
            return string_value;
        }

11. 字元讀寫

        //char data
        public char char_rw_value(int db_area, int iDB_num, int iDB_start_byteadd, string w_or_r, char values = ' ')
        { 
        char char_value = new char();
            if (w_or_r == "r")
                char_value = (char)byte_rw_value(db_area, iDB_num, iDB_start_byteadd, "r");
            else if(w_or_r == "w")
                char_value = (char)byte_rw_value(db_area, iDB_num, iDB_start_byteadd, "w",(byte)values);
            return char_value;
        }