Emerson ROC vs ABB Totalflow — Which Flow Computer Is Right?
Key Takeaway
Compare Emerson ROC800 and ABB Totalflow XFC for flow measurement — hardware, AGA calculations, programming (FST vs TAS), protocols, SCADA integration, and custody transfer.
Quick Answer
Both the Emerson ROC800 and ABB Totalflow XFC are AGA-certified flow computers for custody transfer. ROC is preferred in Emerson OpenEnterprise SCADA environments with EFM reporting. Totalflow is preferred with TAS programming and ABB infrastructure. Both support DNP3 and Modbus for third-party SCADA integration via Ignition or Geo SCADA.
How Do They Compare?
| Feature | Emerson ROC800 | ABB Totalflow XFC |
|---|---|---|
| Manufacturer | Emerson | ABB |
| Config Software | ROCLINK 800 | PCCU32 |
| Programming | FST | TAS (XRC only) |
| Native Protocol | ROC protocol | TFIO |
| AGA-3 | Certified | Certified |
| AGA-7 | Certified | Certified |
| DNP3 | Outstation + master | Outstation + master |
| EFM Reports | Native | Via export |
| SCADA Ecosystem | OpenEnterprise | ABB Ability |
When to Choose Each
- ROC — Emerson SCADA, EFM required, existing ROC fleet
- Totalflow — TAS programming needed, ABB ecosystem, existing Totalflow fleet
- Either — Mixed-vendor environment using DNP3/Modbus SCADA
See also SCADAPack vs Bristol FB300 for general-purpose RTU comparison.
Frequently Asked Questions
Neither is universally better. ROC is preferred in Emerson SCADA environments with EFM reporting. Totalflow is preferred with TAS programming and ABB infrastructure. Both are AGA-certified for custody transfer.
Yes. Via Modbus TCP driver or DNP3 driver. Native ROC protocol requires an intermediate data concentrator or dedicated driver.
Yes. Both implement AGA Report No. 3 identically. Calculated volumes are equivalent for the same installation and composition data.