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kWh Counter with LOGO! - Utilizing Analog Values

Here's how to implement a kWh counter using your LOGO! and analog inputs for voltage and current:

1. Analog Input Scaling: Ensure your analog inputs are correctly scaled to represent Voltage (V) and Currentaccurately. Use the appropriate analog input block settings.
2. Power Calculation: Use an Analog Math function block to multiply the scaled Voltage and Current values (P = V * I). The result will be Power in Watts.
3. Energy Calculation (kWh): Implement a timer block (e.g., PT - Pulse Timer) to accumulate the power over time. Multiply the Watts value by the time interval (in hours) to get Wh. Divide Wh by 1000 to obtain kWh.
4. Accumulation & Reset: Use a memory flag (M Flag) to accumulate the kWh value. You may need a reset function (e.g., triggered by a digital input) to clear the kWh counter periodically.

Troubleshooting Analog Math: If you're having trouble with the Analog Math block, double-check the input scaling and data types. Ensure both V and I inputs are scaled correctly *before* multiplication.

Resources:

• LOGO! 8 - How to calculate energy consumption (kWh)
• Siemens Industry Online Support (SiePortal) - Search for "LOGO! kWh" for more examples and FAQs.

Disclaimer: This is a general guideline. Specific implementation will depend on your application’s requirements and LOGO! version.