This is a proof of concept (POC) for collecting sensor data via the Modbus protocol and saving it to a CSV file. It was designed with the SIEMENS PAC3220 in mind but uses a local mock server to simulate the device for testing purposes.
The project demonstrates:
- Setting up a mock ModbusTCP server to emulate a sensor device.
- Running a client script that continuously reads data from the server and dumps it into a CSV file when certain thresholds are met.
The client script can be adapted to meet your requirements, such as adjusting the read frequency or modifying the CSV handling logic.
Modbus is a protocol used to exchange data between devices. It organizes data into registers:
- Holding Registers (HR): Writable/readable data, often used for configuration or measurements.
- Input Registers (IR): Read-only data, typically used for live sensor values.
Each register holds a 16-bit value and is identified by an address. For example:
- Address 0: Voltage
- Address 1: Current
- Address 2: Power
Registers dont hold historical values, which means a continuous read is needed.
The register map for a specific device like the PAC3220 provides these details.