| Method | Cost | Validity | |--------|------|----------| | | $129–$149 | Lifetime, legal, safe | | Request evaluation extension (rare) | Free | Temporary, contact vendor | | Free open-source alternatives | $0 | Limited features |
In Modbus communication, polling is a technique used by the master device to retrieve data from slave devices. The master device sends a request to the slave device, which responds with the requested data. The master device then polls the slave device at regular intervals to retrieve updated data. This process is essential in industrial automation, as it enables the master device to monitor and control the slave devices in real-time. modbus+poll+key+full
: The master device should process the data received from the slave devices according to the application requirements. | Method | Cost | Validity | |--------|------|----------|
Need help choosing an alternative? Let me know your specific use case (PLC brand, communication protocol, OS), and I can recommend a free or low-cost tool. This process is essential in industrial automation, as
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