PHP and Modbus TCP: Real-time visualization of data monitoring

PHP and Modbus TCP: Real-time visualization of data monitoring

Abstract:
This article introduces how to use PHP and Modbus TCP protocols to realize real-time visualization of data monitoring. Modbus TCP is a communication protocol commonly used for communication between devices in industrial automation systems. By combining PHP's network programming capabilities and data display capabilities, you can easily combine the Modbus TCP protocol with real-time visualization to achieve real-time monitoring and visual display of device data.

Keywords: PHP; Modbus TCP; data monitoring; real-time visualization

1. Introduction
   Modbus TCP is a communication protocol commonly used for communication between devices in industrial automation systems . This protocol connects monitoring equipment and monitored equipment through the TCP/IP network to realize data transmission and interaction. PHP is a popular server-side scripting language with network programming and data presentation capabilities. Combined with the powerful functions of PHP, we can use the Modbus TCP protocol to achieve real-time visualization of data monitoring.
2. Implementation steps
   Step 1: Install and configure the Modbus TCP library
   First, we need to install and configure the Modbus TCP library in the PHP environment. You can use third-party libraries, such as phpmodbus or phpmodbustcp, to easily implement Modbus TCP communication.

Step 2: Establish a connection with the device
Using the functions provided by the Modbus TCP library, we can establish a connection with the device. Usually, we need to provide the IP address and port number of the device, as well as the Modbus address of the device.

Step 3: Read device data
Once a connection is established with the device, the device data can be read using the Modbus TCP protocol. By sending a read command and specifying the address and length of the data, we can obtain the corresponding data from the device.

Step 4: Real-time data display
After obtaining the device data, we can use PHP's data display capability to display the data on the web page in real time. For example, you can use HTML and CSS to create tables or charts of data, and use JavaScript to refresh the data in real time.

3. Code Example
   The following is a simple code example that demonstrates how to use PHP and Modbus TCP protocol to achieve real-time visualization of data monitoring.

<?php
// 安装和配置Modbus TCP库
require_once('phpmodbus/ModbusMaster.php');

// 设备信息
$ip = '192.168.0.1';
$port = 502;
$modbusAddress = 1;

// 建立与设备的连接
$modbus = new ModbusMaster($ip, $port);
$modbus->connect();

// 读取设备数据
$data = $modbus->readMultipleRegisters($modbusAddress, 0, 10);

// 实时数据展示
echo '<table>';
echo '<tr><th>地址</th><th>数值</th></tr>';
foreach ($data as $address => $value) {
    echo '<tr><td>' . $address . '</td><td>' . $value . '</td></tr>';
}
echo '</table>';

// 关闭设备连接
$modbus->disconnect();
?>

4. Conclusion
   By combining the network programming capabilities and data display capabilities of PHP, and the communication capabilities of the Modbus TCP protocol, we can easily achieve real-time visualization of data monitoring. With the powerful functions and flexibility of PHP, we can customize and expand the monitoring system according to actual needs to meet the needs for data monitoring in different industries and application scenarios.

References:
[1] Modbus.org. (2021). Modbus Specifications and Implementation Guides - Modbus.org. [online] Available at: https://modbus.org/ specs.php [Accessed 27 Nov. 2021].

The above is the detailed content of PHP and Modbus TCP: Real-time visualization of data monitoring. For more information, please follow other related articles on the PHP Chinese website!