MergenHub IEC 61850 MMS — IED integration, full model
The object-modelled standard of modern substation automation. MergenHub imports the logical node tree of IEDs from SCL and reads/writes over MMS together with the control model.
| Tag | Address | Value | Quality |
|---|---|---|---|
| Active_Power | MMXU1.TotW.mag.f | 12.84 | |
| Phase_Volt_A | MMXU1.PhV.phsA | 33.10 | |
| Breaker_Pos | XCBR1.Pos.stVal | 2 | |
| Prot_Start | PTOC1.Str.general | 0 | |
| Frequency | MMXU1.Hz.mag.f | 50.01 |
The MergenHub interface — IEC 61850 IED measurements via LN/DO/DA paths; position derived from LN-level reads.
What is IEC 61850?
IEC 61850 describes substation devices (IEDs) with a standard object model: logical device → logical node → data object → data attribute. Reading, writing, reporting and control run over MMS transport; the device structure is defined in SCL (ICD/CID/SCD) files.
Where is it used?
Electricity transmission and distribution substations, protection relays and field IEDs. In multi-vendor substations the common model delivers uniform integration.
Feature coverage
Tag generation from the SCL model and the standard control models are supported.
SCL / ICD import
Import ICD/CID/SCD files to auto-generate tags from the logical node tree — no manual address entry.
Control model
Standard control models: direct-with-normal-security, SBO-with-enhanced-security and other variants (per ctlModel).
Functional constraint
MMS FC selectors (ST, MX, CO, SP, CF…) for access at the data attribute level.
LN-level reads
Some IEDs respond only at logical node level; the driver reads the LN and derives position, avoiding the "green but Bad" trap.
Resilient handshake
The COTP/MMS handshake is bounded by timeouts; it reconnects on dropped links without hanging.
VMD-scope addresses
Domain-less VMD-specific objects and special paths such as LastApplError can also be addressed.