s7netplus二次应用

1. 安装

• 这是个基于S7协议的开源协议
  
  

2. 引用

using S7.Net;

3. 创建PLC对象

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，含参构造函数 
    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. 连接

//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. 断开连接

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

6. PLC数据类型和寻址类型

//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. 读写数据

//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数据读写

//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数据读写

//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. 字符串读写

//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. 字符读写

//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;
}