modbus TCP写入多个线圈
时间: 2023-07-17 13:01:40 浏览: 200
要在Modbus TCP中写入多个线圈,你需要使用功能码 15 或 16。下面是一个示例代码片段,用于使用Python的modbus-tk库进行多个线圈的写入:
```python
from modbus import modbus_tcp
# 创建主站实例
master = modbus_tcp.TcpMaster(host='your_modbus_tcp_host', port=your_modbus_tcp_port)
# 设置线圈的起始地址和数量
coil_start_address = 0 # 起始地址
coil_count = 8 # 线圈数量
# 创建一个包含线圈状态的列表
coil_values = [True, False, True, False, True, False, True, False]
# 写入多个线圈
master.execute(1, cst.WRITE_MULTIPLE_COILS, coil_start_address, output_value=coil_values)
# 关闭连接
master.close()
```
请注意,上述示例假设你已经安装了modbus-tk库,并且将`your_modbus_tcp_host`替换为你的Modbus TCP主机地址,`your_modbus_tcp_port`替换为你的Modbus TCP端口号。另外,你还需要根据你的实际情况调整起始地址、线圈数量和线圈状态列表。
相关问题
qt实现modbus tcp写入
以下是使用Qt实现Modbus TCP写入的示例代码:
```c++
#include <QtNetwork>
#include <QtEndian>
#include <QDebug>
class ModbusTcpClient : public QObject
{
Q_OBJECT
public:
ModbusTcpClient(QObject *parent = nullptr)
: QObject(parent)
, m_socket(new QTcpSocket(this))
{
connect(m_socket, &QTcpSocket::connected, this, &ModbusTcpClient::onSocketConnected);
connect(m_socket, &QTcpSocket::disconnected, this, &ModbusTcpClient::onSocketDisconnected);
connect(m_socket, &QTcpSocket::readyRead, this, &ModbusTcpClient::onSocketReadyRead);
connect(m_socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &ModbusTcpClient::onSocketError);
}
bool connectToHost(const QString &host, quint16 port)
{
m_socket->connectToHost(host, port);
if (!m_socket->waitForConnected(5000)) {
qWarning() << "Failed to connect to host:" << host << "port:" << port << "error:" << m_socket->errorString();
return false;
}
return true;
}
bool writeCoil(quint16 address, bool value)
{
quint8 buffer[12] = { 0 };
quint16 tid = 0x0001; // transaction id
quint16 pid = 0x0000; // protocol id
quint16 len = 0x0006; // pdu length
quint8 uid = 0x01; // unit id
quint16 fcode = 0x0005; // function code
quint16 addr = qToBigEndian(address); // coil address
quint16 val = qToBigEndian(value ? 0xFF00 : 0x0000); // coil value
qToBigEndian(tid, buffer); // write transaction id
qToBigEndian(pid, buffer + 2); // write protocol id
qToBigEndian(len, buffer + 4); // write pdu length
buffer[6] = uid; // write unit id
qToBigEndian(fcode, buffer + 7); // write function code
qToBigEndian(addr, buffer + 9); // write coil address
qToBigEndian(val, buffer + 11); // write coil value
qint64 bytesWritten = m_socket->write(reinterpret_cast<const char *>(buffer), sizeof(buffer));
if (bytesWritten != sizeof(buffer)) {
qWarning() << "Failed to write to socket:" << m_socket->errorString();
return false;
}
if (!m_socket->waitForBytesWritten(5000)) {
qWarning() << "Failed to wait for bytes written:" << m_socket->errorString();
return false;
}
return true;
}
signals:
void connected();
void disconnected();
void error(QAbstractSocket::SocketError error);
void dataReceived(const QByteArray &data);
private slots:
void onSocketConnected()
{
emit connected();
}
void onSocketDisconnected()
{
emit disconnected();
}
void onSocketError(QAbstractSocket::SocketError error)
{
emit error(error);
}
void onSocketReadyRead()
{
QByteArray data = m_socket->readAll();
emit dataReceived(data);
}
private:
QTcpSocket *m_socket;
};
```
使用示例:
```c++
ModbusTcpClient client;
if (client.connectToHost("192.168.1.100", 502)) {
if (client.writeCoil(0x0001, true)) {
qDebug() << "Write coil success.";
} else {
qDebug() << "Write coil failed.";
}
} else {
qDebug() << "Failed to connect to host.";
}
```
在上面的示例中,`ModbusTcpClient`类封装了Modbus TCP客户端。`connectToHost`方法用于连接到Modbus TCP服务器。`writeCoil`方法用于写入线圈的值。线圈地址和值通过参数传递。如果写入成功,则返回`true`,否则返回`false`。在`onSocketReadyRead`槽中,当从服务器收到数据时,会发出`dataReceived`信号。使用时,只需实例化`ModbusTcpClient`类,然后调用`connectToHost`和`writeCoil`方法即可。
qt中modbus tcp 输入状态的线圈解析不使用modbus库
如果你想在Qt中解析Modbus TCP输入状态的线圈,而不使用任何现成的Modbus库,可以按照以下步骤进行:
1. 建立一个TCP连接到Modbus服务器:
```cpp
QTcpSocket socket;
socket.connectToHost("192.168.1.1", 502); // 修改为你的Modbus服务器IP和端口
if (!socket.waitForConnected(5000)) {
qDebug() << "连接到Modbus服务器失败: " << socket.errorString();
return;
}
```
2. 组装一个Modbus TCP请求消息:
```cpp
QByteArray request;
QDataStream stream(&request, QIODevice::WriteOnly);
stream.setByteOrder(QDataStream::BigEndian); // Modbus TCP使用大端字节序
stream << quint16(0x0000) << quint16(0x0000) << quint16(0x0006) << quint16(0x0001) << quint16(0x0000) << quint16(0x0001);
// 第一个quint16(0x0000)是事务标识符,第二个quint16(0x0000)是协议标识符,第三个quint16(0x0006)是消息长度,第四个quint16(0x0001)是功能码,第五个quint16(0x0000)是起始地址,第六个quint16(0x0001)是线圈数量
```
3. 发送请求消息,并等待响应:
```cpp
socket.write(request);
if (!socket.waitForBytesWritten(5000)) {
qDebug() << "写入Modbus请求消息失败: " << socket.errorString();
return;
}
QByteArray response;
if (!socket.waitForReadyRead(5000)) {
qDebug() << "等待Modbus响应消息失败: " << socket.errorString();
return;
}
response = socket.readAll();
```
4. 解析响应消息:
```cpp
QDataStream responseStream(response);
responseStream.setByteOrder(QDataStream::BigEndian);
quint16 transactionIdentifier;
quint16 protocolIdentifier;
quint16 length;
quint8 unitIdentifier;
quint8 functionCode;
quint8 byteCount;
quint8 coilStatus;
responseStream >> transactionIdentifier >> protocolIdentifier >> length >> unitIdentifier >> functionCode >> byteCount >> coilStatus;
if (functionCode & 0x80) {
// 如果功能码的最高位是1,表示响应中包含了错误码
quint8 errorCode;
responseStream >> errorCode;
qDebug() << "Modbus响应错误码: " << errorCode;
return;
}
// 解析线圈状态
for (int i = 0; i < byteCount; i++) {
quint8 byte;
responseStream >> byte;
for (int j = 0; j < 8; j++) {
qDebug() << "线圈" << (i * 8 + j) << "状态: " << (byte & (1 << j));
}
}
```
以上就是一个简单的Modbus TCP输入状态的线圈解析示例。注意,这只是一个基础示例,如果需要解析其他类型的Modbus数据,可能需要更复杂的处理。
相关推荐
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)