SITE_DEMAND_LIMIT
Site demand limiting with a forecast-ahead trigger, allocating the required trim across battery, flexible load and generation, and reporting what it could not cover.
When to use it
Use SITE_DEMAND_LIMIT when a site pays a demand charge or has a contracted import limit at the point of common coupling, and several assets — storage, interruptible load, on-site generation — can each take part of the reduction.
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 | — |
| SITE_KW | REAL | kW |
| KW_OK | BOOL | — |
| LIMIT_KW | REAL | kW |
| FORECAST_15M | REAL | kW |
| MARGIN_KW | REAL | kW |
| RELEASE_KW | REAL | kW |
| TRIM_TC_S | REAL | s |
| BESS_AVAIL_KW | REAL | kW |
| FLEX_AVAIL_KW | REAL | kW |
| GEN_AVAIL_KW | REAL | kW |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| TRIM_KW | REAL | kW |
| TRIM_REQ_KW | REAL | kW |
| BESS_TRIM_KW | REAL | kW |
| LOAD_TRIM_KW | REAL | kW |
| GEN_TRIM_KW | REAL | kW |
| SHORTFALL_KW | REAL | kW |
| LIMIT_HIT | BOOL | — |
| ALM_LIMIT_EXCEEDED | BOOL | — |
| ALM_KW_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 13
- Simulated scans
- 176
- 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 SITE_DEMAND_LIMIT — 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.