我可以使用 libnodave 从 Siemens S7300 读取数据，但无法从 Siemens S71500 读取数据。在代码中，您可以看到我正在尝试从 DB2 读取前 4 个字节的数据。当我更改IP地址和插槽号时，代码在S7300上成功运行
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import org.libnodave.Nodave;
import org.libnodave.PLCinterface;
import org.libnodave.S7Connection;
import org.libnodave.TCPConnection;
public class ConnectPLC {
public static void main(String[] args) {
S7Connection dc;
String ip = "192.168.0.61";
Socket sock;
OutputStream oStream = null;
InputStream iStream = null;
PLCinterface di;
int slot = 1;
try {
System.out.println("Inside the try block");
sock = new Socket(ip, 102);
if(sock != null) {
oStream = sock.getOutputStream();
iStream = sock.getInputStream();
di = new PLCinterface(
oStream,
iStream,
"PLCInterface1",
0,
Nodave.PROTOCOL_ISOTCP);
di.initAdapter();
dc = new TCPConnection(di, 0, slot);
int res = dc.connectPLC();
int x = 0;
if (0 == res) {
System.out.println("++++++++++++++++++++++++++++++++++++");
System.out.println("PLC is connected");
System.out.println("++++++++++++++++++++++++++++++++++++");
byte[] byteArray = new byte[4];
x = dc.readBytes(Nodave.DB, 2, 0, 4, byteArray);
System.out.println("The value of x is "+x);
for (int i = 0; i < byteArray.length ; i++) {
System.out.println("The value at index "+i+" is "+byteArray[i]);
}
System.out.println(dc.getINT(0));
System.out.println(dc.getINT(2));
if (x == 0) {
//byte[] byteArray = dc.msgIn;
for (int i = 0; i < byteArray.length ; i++) {
System.out.println("The value at index "+i+" is "+byteArray[i]);
}
System.out.println(dc.getINT(0));
System.out.println(dc.getINT(2));
}
} else {
System.out.println("PLC is not connected");
}
System.out.println("Now disconnecting\n");
dc.disconnectPLC();
di.disconnectAdapter();
System.out.println();
}
} catch (UnknownHostException e) {
System.out.println("Unknown Host Exception is Caught during the declaration of the socket");
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("IO Exception is Caught during the declaration of the socket");
e.printStackTrace();
}
}
}