Data Archiving and EFM Reports on the Emerson ROC800
Key Takeaway
How to configure data archiving on the ROC800 — hourly/daily records, event logs, EFM reports, contract hour, and archive retrieval methods.
Quick Answer
The ROC800 stores hourly, daily, and event archives in non-volatile memory containing accumulated volumes, average pressures/temperatures, flow time, gas composition, and audit events. Archives are retrieved via ROCLINK 800, EFM (Electronic Flow Measurement) collection by Emerson SCADA Connect, or DNP3 event polling. Contract hour defines the gas day start (e.g., 8:00 AM).
What Does the ROC Archive?
- Hourly records — Accumulated volumes, average DP/SP/temperature, flow time
- Daily records — Daily totals, averages, min/max
- Event log — Configuration changes, alarms, power events, operator actions
- Alarm archive — Timestamped alarm activations and clears
What Is the Contract Hour?
The gas day start/end time (e.g., 8:00 AM to 7:59:59 AM). Must match the gas contract and SCADA configuration for volume reconciliation.
How Do You Retrieve Archives?
- ROCLINK 800 Archive Viewer with CSV export
- EFM collection by Emerson SCADA Connect or Data Manager
- DNP3 event polling by Geo SCADA or Ignition
- Modbus register polling for current meter run values
What Is EFM?
Electronic Flow Measurement — Emerson's native archive format for structured flow data collection. EFM-compatible SCADA systems can automatically retrieve and archive ROC flow records with full measurement detail including gas composition, calculation parameters, and audit trail.
Frequently Asked Questions
Typically 35 days hourly and up to 24 months daily, varying by model and memory configuration. Extended via memory card on supported models.
The gas day start time (e.g., 8:00 AM). Daily volumes accumulate from this time to 24 hours later. Must match the gas contract.
Electronic Flow Measurement — Emerson's native archive format for structured flow data collection, compatible with Emerson SCADA Connect and Data Manager.