引用

using System.Runtime.InteropServices;//DllImport调用非托管DLL函数需要该引用支持

数据项定义

        private libnodave.daveOSserialType fds;

        private libnodave.daveInterface di;

        public libnodave.daveConnection dc;

        static int localPPI = 0;

        static int plcPPI = 2;

        private int _errorCode;

        private bool _connected;

连接PLC

public bool ConnectPLC(string portnum, string baud, int parity)

        {

            if (_connected) disconnectPLC();

            fds.rfd = libnodave.setPort(portnum, baud, parity );

             fds.wfd=fds.rfd;

                if (fds.rfd > 0)

                {

                    di = new libnodave.daveInterface(fds, "IF1", localPPI, libnodave.daveProtoPPI, libnodave.daveSpeed187k);

                    di.setTimeout(1000000);

                    dc = new libnodave.daveConnection(di, plcPPI, 0, 0);

                    if (0 == dc.connectPLC()) { _connected = true; return true; }

                }

                return false;

        }

断开PLC

public void disconnectPLC()

        {

            if (dc != null)

            {

                dc.disconnectPLC();

            }

            libnodave.closePort(fds.rfd);

            _connected = false;

        }

写数据

        [DllImport("libnodave.dll"/*, PreserveSig=false */ )]

        public static extern void davePut8At(byte[] b, int pos, int v);

        [DllImport("libnodave.dll"/*, PreserveSig=false */ )]

        public static extern void davePut16At(byte[] b, int pos, int v);

        [DllImport("libnodave.dll"/*, PreserveSig=false */ )]

        public static extern void davePut32At(byte[] b, int pos, int v);

        [DllImport("libnodave.dll"/*, PreserveSig=false */ )]

        public static extern void davePutFloatAt(byte[] b, int pos, float v);

        public bool WriteBytes(AreaType area, int db, int address, int numBytes, byte[] buf)

        {

            if (area != AreaType.daveDB) db = 0;

            _errorCode = dc.writeBytes((int)area, db, address, numBytes , buf);

            return 0 == _errorCode;

        }

相关数据区常量定义

public enum AreaType : int

    {

        daveSysInfo = 0x3, // System info of 200 family

        daveSysFlags = 0x5, //    System flags of 200 family

        daveAnaIn = 0x6,     // analog inputs of 200 family

        daveAnaOut = 0x7, // analog outputs of 200 family

        daveP = 0x80,     // direct peripheral access

        daveInputs = 0x81,   // Output

        daveOutputs = 0x82,  // Input

        daveFlags = 0x83,    // M memory

        daveDB = 0x84,  // data blocks

        daveDI = 0x85,     // instance data blocks

        daveLocal = 0x86, // not tested

        daveV = 0x87,     // don't know what it is

        daveCounter = 28, // S7 counters

        daveTimer = 29,     // S7 timers

        daveCounter200 = 30, // IEC counters (200 family)

        daveTimer200 = 31, // IEC timers (200 family)

    }

断开PLC连接：if (plc1.connected) plc1.disconnectPLC();

读取MB5，MW6，MD8，MD14，数据类型分别为Byte，Int, Dint, Real：

byte[] buf=new byte[11];

            plc1.ReadBytes(AreaType.daveFlags, 0, 5, 11,buf);

            byte MB5 = (byte)plc1.dc.getS8();

            short MW6 = (short) plc1.dc.getS16();

            int MD8 = plc1.dc.getS32();

            float MD14 = plc1.dc.getFloatAt(9);

读位数据：

            bool M5_3 = 0!=(MB5 & (1 << 3)); //获取M5.3

写入MB5，MW6，MD8，MD14：

   byte[] buf = new byte[11];

            byte MB5 = 8;

            short MW6 =2;

            int MD8 = 3;

            float MD14 =4;

            PLCItem.davePut8At(buf, 0, MB5);

            PLCItem.davePut16At(buf, 1, MW6);

            PLCItem.davePut32At(buf, 3, MD8);

            PLCItem.davePutFloatAt(buf,9, MD14);

            plc1.WriteBytes(AreaType.daveFlags, 0, 5, 20, buf);

写位数据：

          MB5 |= (byte)((MB5_3 ? 1 : 0) << 3);//设置M5.3