C#与PLC通讯的实现代码

using S7.Net;

Plc plc = new Plc(CpuType.S71200, "127.0.0.1", 0, 1);		

try
{
	plc.Open();
}
catch(Exception)
{
	Console.WriteLine($"连接到PLC设备失败：IsConnect = {plc.IsConnected},IsAvailable={plc.IsAvailable}");
	return;
}

/*
方法：public object Read(string variable)
入参：读取数据地址
出参：Object类型数据，可强制类型转换
*/
var db1Bool1 = plc.Read("DB1.DBX0.0");
Console.WriteLine("DB1.DBX0.0:" + db1Bool1);

bool db1Bool2 = (bool)plc.Read("DB1.DBX0.1");
Console.WriteLine("DB1.DBX0.1:" + db1Bool2);

int IntVariable = (ushort)plc.Read("DB1.DBW2.0");
Console.WriteLine("DB1.DBW2.0:" + IntVariable);

float RealVariable = ((uint)plc.Read("DB1.DBD4.0")).ConvertToFloat();
Console.WriteLine("DB1.DBD4.0:" + RealVariable);

var dIntVariable = (uint)plc.Read("DB1.DBD8.0");
Console.WriteLine("DB1.DBD8.0: " + dIntVariable);

var dWordVariable = (uint)plc.Read("DB1.DBD12.0");
Console.WriteLine("DB1.DBD12.0: " + Convert.ToString(dWordVariable, 16));

var wordVariable = (ushort)plc.Read("DB1.DBW16.0");
Console.WriteLine("DB1.DBW16.0: " + Convert.ToString(wordVariable,16));

/*
方法：public byte[] ReadBytes(DataType dataType, int db, int startByteAdr, int count)
入参：
	1、DataType数据类型，可选择从DB块或者Memory中读取；
	2、db：1：DataBlock=1,Memory=0；
	3、startByteAdr：起始地址，即DB块的起始偏移量；
	4、count:读取大小，该大小由读取的DB块的最后一个数据的偏移量和大小决定，这里最后一个字节WordVariable偏移量为16，数据类型为word，2个字节，因此此次读取为16+2=18个字节。
出参：Byte[],这里Byte[]的大小必然和count的大小是相同的，
*/
//读取数据选择从DB块中读取，db设置为1，起始地址为0，读取18个字节
var bytes = plc.ReadBytes(DataType.DataBlock, 1, 0, 18);
//取字节0中的第0位
var db1Bool1 = bytes[0].SelectBit(0);
Console.WriteLine("DB1.DBX0.0:" + db1Bool1);
//取字节0中的第1位
bool db1Bool2 = bytes[0].SelectBit(1); ;
Console.WriteLine("DB1.DBX0.1:" + db1Bool2);
//跳到字节2并连续取两个字节数据
int IntVariable = S7.Net.Types.Int.FromByteArray(bytes.Skip(2).Take(2).ToArray());
Console.WriteLine("DB1.DBW2.0:" + IntVariable);
//...
double RealVariable = S7.Net.Types.Real.FromByteArray(bytes.Skip(4).Take(4).ToArray());
Console.WriteLine("DB1.DBD4.0:" + RealVariable);
//...
int dIntVariable = S7.Net.Types.DInt.FromByteArray(bytes.Skip(8).Take(4).ToArray());
Console.WriteLine("DB1.DBD8.0: " + dIntVariable);
//...
uint dWordVariable = S7.Net.Types.DWord.FromByteArray(bytes.Skip(12).Take(4).ToArray());
Console.WriteLine("DB1.DBD12.0: " + Convert.ToString(dWordVariable, 16));
//...
ushort wordVariable = S7.Net.Types.Word.FromByteArray(bytes.Skip(16).Take(2).ToArray());
Console.WriteLine("DB1.DBW16.0: " + Convert.ToString(wordVariable, 16));

/*
方法：public void Write(string variable, object value)
入参：
	1、string variable：写入地址
	2、object value，写入数据
*/
plc.Write("DB1.DBX0.0", true);
plc.Write("DB1.DBD12.0", 123457);

/*
public void WriteBytes(DataType dataType, int db, int startByteAdr, byte[] value)
用法如同ReadBytes,这里就不在写例程了，有兴趣的可以自己研究一下
*/

 plc.Close();