The need and approach
A total bill may not explain which equipment consumed energy or when. Comparisons can mislead if meter hierarchy, measurement boundaries and production context have not been defined.
Data flow
Energy meter → register read → unit and time validation → interval consumption → comparison.
Instantaneous power in kW and energy in kWh are different quantities. Differences between cumulative readings require checks for resets, rollover, device replacement and missing records. Submeters are compared with the main meter only after their boundaries are understood.
Illustrative workflow
Two shifts are compared using consumption, output and operating time. A higher kWh total by itself does not establish inefficiency.
Questions for discovery
- Which feeds or machines are measured separately?
- Which registers and units does the meter expose?
- How can a reset be identified?
- Are shift and production records available?
- Which conditions need to be comparable?
What data is needed for factory energy monitoring?
First identify which distribution board, line or equipment is measured separately. Read instantaneous power, cumulative active energy and other available meter registers in their correct units. Main meters and submeters should not be compared without matching measurement boundaries and time intervals.
Consumption per shift or product also requires dependable production quantities and timing. Without that context, the system can show consumption but cannot correctly calculate energy performance per unit of output.
Energy monitoring pilot outputs
A pilot can define a meter hierarchy, data dictionary and period-consumption view. Test how meter resets, power loss, device replacement and missing readings affect calculations.
The energy-meter application scenario illustrates the data flow. Meter access and mapping can use the approach described under PLC and machine integration.
Limits and field conditions
Monitoring does not guarantee savings. Tariff calculations and billing accuracy require their own scope and validation.
Common questions
Can existing Modbus energy meters be used?
They can be assessed after validating the model’s communication interface, register map, scaling and access conditions. Total energy, power and other register addresses can vary between models.
Does energy monitoring automatically produce savings?
Monitoring makes the timing and location of consumption visible. Savings require an operational or technical intervention and a measured comparison afterwards. A specific saving percentage should not be promised without evidence.
What information should accompany an energy monitoring enquiry?
Include meter models, their board or line assignments, communication access, shift information, reporting periods and any production data. Installing new meters and integrating software may be separate cost items.