Question 1

What is the difference between a data logger and a SCADA system?

Accepted Answer

A data logger records time-stamped measurements for later analysis—its role is to collect and store data. A SCADA (Supervisory Control and Data Acquisition) system adds real-time monitoring, dynamic visualization, process control, and alarm management. In practice, modern solutions combine both: a cloud-based data logger often includes a real-time dashboard and alerts, while a cloud-based SCADA system maintains a complete history. The main distinction remains control: only SCADA controls the equipment.

Question 2

How long is data stored in a cloud-based data logger?

Accepted Answer

The retention period depends on the solution and the subscription tier. Eziwan Cloud retains data for 12 months (Standard plan) to 10 years (Compliance plan). For certain industries (food processing, pharmaceuticals, energy), regulatory requirements mandate minimum retention periods: 2 years for HACCP traceability and 5 years for energy data in France. Long-term cloud storage is significantly less expensive than paper archives or on-premises servers.

Question 3

What is the temporal resolution (time step) of an industrial data logger?

Accepted Answer

The time resolution (or sampling interval) is configurable: from 100 ms for fast variables (vibrations, motor current) up to several hours for slow variables (daily energy consumption). In industrial practice, the most common sampling intervals are 1 s (flow rate, pressure), 10 s (electrical power), 1 min (temperatures), and 15 min (energy meters in accordance with the remote meter reading standard). A short time step generates more data but provides better event resolution.

Question 4

Does the data logger work offline (without an Internet connection)?

Accepted Answer

Yes, the Eziwan data logger includes local flash memory that stores measurements even when offline. The local storage capacity (typically 32 to 128 GB) allows for the retention of weeks to several months of data, depending on the sampling interval. When the Internet connection is restored, the data is synchronized to the cloud with its original timestamps. This “offline-first” architecture is critical for industrial sites where connectivity can be intermittent.

Question 5

What export formats are available from a cloud-based data logger?

Accepted Answer

Eziwan Cloud offers several export formats: CSV (compatible with Excel, LibreOffice, and Python pandas), JSON (for API integrations), PDF (formatted reports with charts and statistics), and XLSX (pivot tables). Exports can be scheduled (daily/weekly/monthly reports sent by email) or generated on demand for a specific date range. For HACCP applications, certified PDF reports with electronic signatures are available.

Question 6

Does the data logger comply with HACCP requirements for food refrigeration?

Accepted Answer

To ensure HACCP (Hazard Analysis and Critical Control Points) compliance, the data logger must continuously record temperatures in cold rooms, freezers, and refrigerated display cases, with a maximum data acquisition interval of 30 minutes, in accordance with EC Regulation 853/2004. Alerts triggered by temperature exceedances must be logged. Eziwan offers certified PT100/PT1000 sensors and humidity probes, with PDF reports that comply with DDPP requirements.

Question 7

Can 4–20 mA or 0–10 V sensors be connected to a cloud-based data logger?

Accepted Answer

Yes, industrial data loggers have universal analog inputs that accept 4–20 mA signals (current, the most common in industry), 0–10 V, 0–5 V, and sometimes thermocouples (types J, K, T) and PT100/PT1000 probes. Each input can be configured for signal type, scale factor, and physical unit (°C, bar, m³/h, kW, etc.). Analog-to-digital conversion is typically 12 to 16 bits, corresponding to a resolution of 0.025% to 0.0015% of full scale.

Question 8

How do you calculate performance KPIs based on recorded data?

Accepted Answer

The Eziwan cloud data logger includes a calculation engine that allows you to create custom KPIs from raw measurements: OEE (availability × performance × quality), specific energy consumption (kWh/unit produced), heat exchanger efficiency (measured ΔT / nominal ΔT), and average load factor. These KPIs are calculated continuously and displayed on dashboards with trends and comparisons across different periods.

Protocol	Interface	Typical Equipment
Modbus RTU	RS485/RS232	Drives, meters, PLCs
Modbus TCP	Ethernet	Industrial IP devices
4–20 mA	Analog Input	Pressure, temperature, and flow transmitters
Pulse (S0)	Digital Input	Energy, water, and gas meters
M-Bus	M-Bus	Heat, water, and gas meters
BACnet IP	Ethernet	HVAC and building automation systems
SNMP	Ethernet	IT equipment (UPS, air conditioning)

Industrial Cloud Data Logger — Data Logging and Monitoring

What is an industrial cloud data logger?

Recorded Physical Quantities

Architecture of an Industrial Cloud Data Logger

Supported Acquisition Protocols

Alert and Threshold Management

Regulatory Compliance and Traceability

Frequently Asked Questions

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What is an industrial cloud data logger?​

Recorded Physical Quantities​

Architecture of an Industrial Cloud Data Logger​

Supported Acquisition Protocols​

Alert and Threshold Management​

Regulatory Compliance and Traceability​