How does the Internet of Things gateway collect data from PLC devices? This time, I will introduce the definition and function of the Internet of Things gateway, understand the basic principles and working methods of PLC equipment, and elaborate on them in detail from the three aspects of connection method, communication protocol and data collection method. Based on actual cases, the key points and precautions for data collection of PLC equipment by the Internet of Things gateway are summarized.
1. Connection method
There are two ways to connect the Passerelle IoT to PLC devices: direct connection and indirect connection. The direct connection method is to directly connect the gateway to the communication interface of the PLC device to realize direct collection of data; the indirect connection method is to transmit the data to the gateway for collection through the communication protocol between the PLC device and the host computer.
2. Communication protocol
There are many choices for communication protocols between Passerelles IoT and PLC devices, such as Modbus, OPC UA, Profinet, etc. Choosing the appropriate communication protocol ensures reliable transmission and efficient collection of data.
3. Data collection method
The methods for data collection by the Passerelle pour l'internet des objets from PLC devices include real-time collection and scheduled collection. Real-time collection refers to establishing a real-time communication connection between the gateway and the PLC device to obtain the data of the PLC device in real time; scheduled collection means that the gateway sends instructions to the PLC device at regular intervals to obtain the data of the device.
4. Key points and precautions
In the process of collecting data from PLC equipment by the Internet of Things gateway, you need to pay attention to the following key points and precautions:
1. Ensure that the connection between the gateway and PLC equipment is stable and reliable to avoid interruption of data transmission;
2. Choose a suitable communication protocol to ensure accurate transmission and analysis of data;
3. Set the frequency and time interval of data collection reasonably to avoid network congestion caused by too much data;
4. Monitor and analyze the collected data in real time, detect abnormal situations in a timely manner and take corresponding measures.
Conclusion : The data collection of PLC equipment by the Internet of Things gateway is one of the important links in realizing the industrial Internet. Through reasonable selection of connection methods, communication protocols and data collection methods, efficient collection and management of PLC device data can be achieved. However, during practical application, some key points and precautions need to be noted to ensure the stability and reliability of data collection.