GRID_CONNECT_MON
Service-transformer loading and grid-voltage monitor, publishing the headroom the load manager allocates from.
When to use it
Use GRID_CONNECT_MON when a charging site sits behind a service transformer whose rating, not the switchgear, is the binding constraint, and the loading and connection voltage have to be watched and turned into a headroom figure and a shed request.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| ENABLE | BOOL | — |
| XFMR_KVA | REAL | kVA |
| XFMR_RATING | REAL | kVA |
| V_GRID | REAL | V |
| V_NOM | REAL | V |
| MTR_OK | BOOL | — |
| WARN_PCT | REAL | % |
| ALLOC_PCT | REAL | % |
| OVERLOAD_PCT | REAL | % |
| TRIP_PCT | REAL | % |
| OVERLOAD_DLY | TIME | — |
| TRIP_DLY | TIME | — |
| HYST_PCT | REAL | % |
| V_HI_PCT | REAL | % |
| V_LO_PCT | REAL | % |
| V_DLY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| LOADING_PCT | REAL | % |
| OVERLOAD | BOOL | — |
| WARNING | BOOL | — |
| AVAIL_KVA | REAL | kVA |
| SHED_REQ | BOOL | — |
| ALM_TRIP | BOOL | — |
| ALM_V_HI | BOOL | — |
| ALM_V_LO | BOOL | — |
| ALM_MTR_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| VALID | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
GRID_CONNECT_MON commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 9
- Simulated scans
- 172
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
- Conforms to IEC 61499
Download GRID_CONNECT_MON — free
Create a free Ri Tech account to download the block. You get the Structured Text body, the Rockwell Add-On Instruction (.L5X), the Schneider Control Expert DFB (.XDB), PLCopen XML, the IEC 61499 function block type (.fbt) and the datasheet.
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Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.