modbus TCP写入多个线圈

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：

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

modbus tcp写多个线圈按位解析C语言代码示例

Modbus TCP是一种工业标准通信协议，用于设备间的远程数据交换。如果你想通过C语言实现写入多个线圈（ coils）的操作，并对这些线圈地址进行按位解析，这里是一个简单的示例。请注意，这只是一个基础框架，实际应用中需要连接到Modbus服务器并处理错误处理：

#include <stdio.h>
#include <string.h>
#include "modbus_tcp_client.h" // 假设这是包含Modbus客户端函数的库

// 定义线圈数据结构和地址列表
typedef struct {
    uint16_t coil_address; // 线圈地址
    bool value;            // 线圈状态
} CoilData;

CoilData coils[] = { {0x0001, true}, {0x0002, false}, {0x0004, true} }; // 示例线圈地址和值

void write_coils(uint16_t slave_id, uint16_t start_address, CoilData* data, int num_of_coils) {
    ModbusTcpClient client;
    uint16_t* coil_values = (uint16_t*)malloc(num_of_coils * sizeof(uint16_t));
    
    // 按位解析并将状态转换为二进制值
    for (int i = 0; i < num_of_coils; i++) {
        coil_values[i] = (data[i].value ? 1 : 0) << (start_address + i);
    }

    if (client.connect_to_slave(slave_id)) {
        if (client.write_multiple_coils(start_address, coil_values, num_of_coils)) {
            printf("Successfully wrote to coils %d-%d\n", start_address, start_address + num_of_coils - 1);
        } else {
            printf("Failed to write to coils.\n");
        }
        free(coil_values);
    } else {
        printf("Failed to connect to slave.\n");
    }
}

// 使用示例
int main() {
    write_coils(SLAVE_ID, 0x0000, coils, sizeof(coils) / sizeof(CoilData)); // 替换 SLAVE_ID 为你的设备ID
    return 0;
}

qt实现modbus tcp写入

以下是使用Qt实现Modbus TCP写入的示例代码：

#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：

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。