java Modbus TCP SCADA/HMI 工作很慢
java Modbus TCP SCADA/HMI works very slow
我正在尝试在 Java 中编写代码,以便通过 Modbus TCP 将我的计算机连接到 PLC。我写了代码在我的 PLC 上切换 ON/OFF 5 个线圈,但应用程序运行非常慢——当我按下按钮两次(这是切换 ON/OFF 线圈的条件)PLC 需要 4- 6秒得到命令。但我希望它能快速工作。
在代码中,我编写了主程序 class,其中我建立了连接,线程 class,我在其中为每个线圈执行 ModBusTCPTransaction。我将线程 class 称为 »Daemon« 并在主 class 中启动它。但也许这不是事情应该做的方法——也许任何人都可以用 2/3 的句子写下 SCADA/HMI 系统的常见程度 done/work……我什至需要一个守护线程吗class……?
这是我的代码
import java.net.*;
import java.io.*;
import net.wimpi.modbus.*;
import net.wimpi.modbus.msg.*;
import net.wimpi.modbus.io.*;
import net.wimpi.modbus.net.*;
import net.wimpi.modbus.util.*;
import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;
// 1. daemon class
class NitCoil extends Thread {
private WriteCoilRequest coil_req = null;
private ModbusTCPTransaction trans = null;
private int i;
NitCoil(String s , int i) {
super(s);
this.i = i;
}
public void run(){
try {
while(true) {
coil_req = new WriteCoilRequest(i, ModbusTest.coil_con[i]);
trans = new ModbusTCPTransaction(ModbusTest.con);
trans.setRequest(coil_req);
trans.execute();
this.sleep((int)(Math.random()*100));
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
//2. main class
public class ModbusTest {
public static TCPMasterConnection con = null;
public static boolean[] coil_con = {false,false,false,false,false};
public static void main(String[] args) {
try {
/* Variables for storing the parameters */
InetAddress addr = null; //the slave's address
int port = Modbus.DEFAULT_PORT;
int repeat = 1; //a loop for repeating the transaction
//3. Setup the parameters
if (args.length < 1) {
System.exit(1);
} else {
try {
String astr = "192.168.0.25:502";
int idx = astr.indexOf(':');
{
port = Integer.parseInt(astr.substring(idx+1));
astr = astr.substring(0,idx);
}
addr = InetAddress.getByName(astr);
if (args.length == 1) {
repeat = Integer.parseInt(args[0]);
}
} catch (Exception ex) {
ex.printStackTrace();
System.exit(1);
}
}
//4. Open the connection
con = new TCPMasterConnection(addr);
con.setPort(port);
con.connect();
//5. defining frame, panel, button
JFrame frame = new JFrame("JFrame Example");
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JLabel label = new JLabel("This is a label!");
//6. creating 5 buttons
JButton[] button = new JButton[5];
for (int j = 0; j < 5; j++){
final int temp = j;
button[j] = new JButton(String.valueOf(j));
//7. button
button[j].setText("Switch ON light "+j);
button[j].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (coil_con[temp] == true)
coil_con[temp] = false;
else
coil_con[temp] = true;
}
});
};
panel.add(label);
panel.add(button[0]);
panel.add(button[1]);
panel.add(button[2]);
panel.add(button[3]);
panel.add(button[4]);
//8. call of demon
NitCoil n1 = new NitCoil("daemon1", 0);
n1.setDaemon(true);
n1.start();
NitCoil n2 = new NitCoil("daemon2", 1);
n2.setDaemon(true);
n2.start();
NitCoil n3 = new NitCoil("daemon3", 2);
n3.setDaemon(true);
n3.start();
NitCoil n4 = new NitCoil("daemon4", 3);
n4.setDaemon(true);
n4.start();
NitCoil n5 = new NitCoil("daemon5", 4);
n5.setDaemon(true);
n5.start();
//9. Close the connection
JButton buttonClose = new JButton();
buttonClose.setText("disconnect");
buttonClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ModbusTest.con.close();
}
});
panel.add(buttonClose);
panel.setBackground(Color.green);
frame.add(panel);
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
您查看过 Wireshark 的响应时间吗?也许设备响应缓慢。
此外,按照您目前的设置方式,您一直在连续写入所有五个线圈,这可能并不理想。
由于您的线圈地址是连续的,您还可以使用 WriteMultipleCoils 函数 (0x0F) 在一个请求中写入所有五个线圈。
我正在尝试在 Java 中编写代码,以便通过 Modbus TCP 将我的计算机连接到 PLC。我写了代码在我的 PLC 上切换 ON/OFF 5 个线圈,但应用程序运行非常慢——当我按下按钮两次(这是切换 ON/OFF 线圈的条件)PLC 需要 4- 6秒得到命令。但我希望它能快速工作。
在代码中,我编写了主程序 class,其中我建立了连接,线程 class,我在其中为每个线圈执行 ModBusTCPTransaction。我将线程 class 称为 »Daemon« 并在主 class 中启动它。但也许这不是事情应该做的方法——也许任何人都可以用 2/3 的句子写下 SCADA/HMI 系统的常见程度 done/work……我什至需要一个守护线程吗class……?
这是我的代码
import java.net.*;
import java.io.*;
import net.wimpi.modbus.*;
import net.wimpi.modbus.msg.*;
import net.wimpi.modbus.io.*;
import net.wimpi.modbus.net.*;
import net.wimpi.modbus.util.*;
import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;
// 1. daemon class
class NitCoil extends Thread {
private WriteCoilRequest coil_req = null;
private ModbusTCPTransaction trans = null;
private int i;
NitCoil(String s , int i) {
super(s);
this.i = i;
}
public void run(){
try {
while(true) {
coil_req = new WriteCoilRequest(i, ModbusTest.coil_con[i]);
trans = new ModbusTCPTransaction(ModbusTest.con);
trans.setRequest(coil_req);
trans.execute();
this.sleep((int)(Math.random()*100));
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
//2. main class
public class ModbusTest {
public static TCPMasterConnection con = null;
public static boolean[] coil_con = {false,false,false,false,false};
public static void main(String[] args) {
try {
/* Variables for storing the parameters */
InetAddress addr = null; //the slave's address
int port = Modbus.DEFAULT_PORT;
int repeat = 1; //a loop for repeating the transaction
//3. Setup the parameters
if (args.length < 1) {
System.exit(1);
} else {
try {
String astr = "192.168.0.25:502";
int idx = astr.indexOf(':');
{
port = Integer.parseInt(astr.substring(idx+1));
astr = astr.substring(0,idx);
}
addr = InetAddress.getByName(astr);
if (args.length == 1) {
repeat = Integer.parseInt(args[0]);
}
} catch (Exception ex) {
ex.printStackTrace();
System.exit(1);
}
}
//4. Open the connection
con = new TCPMasterConnection(addr);
con.setPort(port);
con.connect();
//5. defining frame, panel, button
JFrame frame = new JFrame("JFrame Example");
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JLabel label = new JLabel("This is a label!");
//6. creating 5 buttons
JButton[] button = new JButton[5];
for (int j = 0; j < 5; j++){
final int temp = j;
button[j] = new JButton(String.valueOf(j));
//7. button
button[j].setText("Switch ON light "+j);
button[j].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (coil_con[temp] == true)
coil_con[temp] = false;
else
coil_con[temp] = true;
}
});
};
panel.add(label);
panel.add(button[0]);
panel.add(button[1]);
panel.add(button[2]);
panel.add(button[3]);
panel.add(button[4]);
//8. call of demon
NitCoil n1 = new NitCoil("daemon1", 0);
n1.setDaemon(true);
n1.start();
NitCoil n2 = new NitCoil("daemon2", 1);
n2.setDaemon(true);
n2.start();
NitCoil n3 = new NitCoil("daemon3", 2);
n3.setDaemon(true);
n3.start();
NitCoil n4 = new NitCoil("daemon4", 3);
n4.setDaemon(true);
n4.start();
NitCoil n5 = new NitCoil("daemon5", 4);
n5.setDaemon(true);
n5.start();
//9. Close the connection
JButton buttonClose = new JButton();
buttonClose.setText("disconnect");
buttonClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ModbusTest.con.close();
}
});
panel.add(buttonClose);
panel.setBackground(Color.green);
frame.add(panel);
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
您查看过 Wireshark 的响应时间吗?也许设备响应缓慢。
此外,按照您目前的设置方式,您一直在连续写入所有五个线圈,这可能并不理想。
由于您的线圈地址是连续的,您还可以使用 WriteMultipleCoils 函数 (0x0F) 在一个请求中写入所有五个线圈。