[筆記] C# 的 模擬 C++ Union 方法

Modbus 通訊中針對暫存區作讀寫時必須將數值拆解成 4 個 Byte 後帶入訊息

這時使用 Union 可以簡單的轉換

[筆記] 以 Modbus 對台達 PLC 資料收集

ASCII Mode 的通訊格式

LRC 的的計算方式是由 Address 開始到 Data 的最後一個 Byte 的加總值，移除進位後取 2 的補數就是LRC 的值。

class MyModbus
    {
        public static SerialPort sp = new SerialPort();

        public static bool Init()
        {
            sp.PortName = "COM2";
            sp.BaudRate = 9600;
            sp.DataBits = 7;
            sp.StopBits = StopBits.One;
            sp.Parity = Parity.Even;
            sp.ReadTimeout = 1000;
            sp.Open();
            return true;
        }

        public static bool Close()
        {
            sp.Close();
            return true;
        }

        public static bool Send(string Massage)
        {
            if (sp.IsOpen == false) return false;
            sp.DiscardInBuffer();
            sp.DiscardOutBuffer();
            sp.Write(Massage);
            return true;
        }

        public static bool Receive(out string Massage)
        {
            Massage = string.Empty;
            if (sp.IsOpen == false) return false;
            string str = sp.ReadTo("\r\n");
            //比對開頭碼是否為':'
            if (str[0] != ':') return false;
            //移除符號
            str = str.Trim(':', '\r', '\n');
            //檢查 LRC
            string checksum = str.Substring(str.Length - 2, 2);
            string Data = str.Substring(0, str.Length - 2);
            if (checksum != Lrc(Data)) return false;
            Massage = str;
            return true;
        }


        public static string BulidMassage(byte Address, byte Type, string Start, string Data)
        {
            string Cmd = Address.ToString("X2") + Type.ToString("X2") + Start + Data;
            string Massage = ':' + Cmd + Lrc(Cmd) + "\r\n";
            return Massage;
        }


        public static string Lrc(string Massage)
        {
            byte sum = 0;
            for (int idx = 0; idx < Massage.Length; idx += 2)
            {
                string str = Massage.Substring(idx, 2);
                byte value = Convert.ToByte(str, 16);
                sum = (byte)((sum + value) & 0xff);

            }
            //取補數
            byte checksum = (byte)((~sum + 1) & 0xff);
            string Hex = checksum.ToString("X2");
            return Hex;
        
        }

    }

關放 PLC 內的 Address 可參考 PLC 冊。

class MyPLC
    {
        public MyPLC()
        {
            MyModbus.Init();
        }

        ~MyPLC()
        {
            MyModbus.Close();
        }

        public bool[] ReadAllY()
        {
            bool[] Y = new bool[8];
            //string Massage = MyModbus.BulidMassage(1, 3, "0614", "0008");
            string Massage = MyModbus.BulidMassage(1, 2, "0500", "0008");
            MyModbus.Send(Massage);
            string Data = string.Empty;
            MyModbus.Receive(out Data);

            string Temp = Data.Substring(6, 2);
            byte Value = Convert.ToByte(Temp);

            for (int idx = 0; idx < Y.Length; idx++)
            {
                Y[idx] = (Value & (0x01 << idx)) > 0x00 ? true : false;
            }
            return Y;
        }

        public bool SetY(int Number , bool OnOFF)
        {
            string CoilNumber = "05" + Number.ToString("X2");
            string Massage = MyModbus.BulidMassage(1, 5, CoilNumber, OnOFF ? "FF00" : "0000");
            MyModbus.Send(Massage);
            string Data = string.Empty;
            MyModbus.Receive(out Data);

            string Temp = Data.Substring(4, 4);
            if (Temp != CoilNumber) return false;
            Temp = Data.Substring(8, 4);
            if(OnOFF)
            {
                if (Temp != "FF00") return false;
            }
            else
            {
                if (Temp != "0000") return false;
            }

            return true;
        }


        public bool[] ReadAllX()
        {
            bool[] X = new bool[16];
            string Massage = MyModbus.BulidMassage(1, 2, "0200", "0010");
            MyModbus.Send(Massage);
            string Data = string.Empty;
            MyModbus.Receive(out Data);

            string Temp = Data.Substring(6, 2);
            byte Value = Convert.ToByte(Temp);

            for (int idx = 0; idx < X.Length; idx++)
            {
                X[idx] = (Value & (0x01 << idx)) > 0x00 ? true : false;
            }
            return X;
        }

        public bool[] ReadAllM()
        {
            bool[] X = new bool[16];
            string Massage = MyModbus.BulidMassage(1, 2, "0800", "0008");
            MyModbus.Send(Massage);
            string Data = string.Empty;
            MyModbus.Receive(out Data);

            string Temp = Data.Substring(6, 2);
            byte Value = Convert.ToByte(Temp);

            for (int idx = 0; idx < X.Length; idx++)
            {
                X[idx] = (Value & (0x01 << idx)) > 0x00 ? true : false;
            }
            return X;
        }

        public bool SetM(int Number, bool OnOFF)
        {
            string CoilNumber = "08" + Number.ToString("X2");
            string Massage = MyModbus.BulidMassage(1, 5, CoilNumber, OnOFF ? "FF00" : "0000");
            MyModbus.Send(Massage);
            string Data = string.Empty;
            MyModbus.Receive(out Data);

            string Temp = Data.Substring(4, 4);
            if (Temp != CoilNumber) return false;
            Temp = Data.Substring(8, 4);
            if (OnOFF)
            {
                if (Temp != "FF00") return false;
            }
            else
            {
                if (Temp != "0000") return false;
            }

            return true;
        }

    }

[筆記] FAULHABER MCBL 驅動器命令控制