EXPORT_LIMIT_GUARD
Zero or limited export enforcement: derives a rate-limited generation ceiling from the measured tie flow before the export limit is reached.
When to use it
Use EXPORT_LIMIT_GUARD when an interconnection agreement caps how much power may leave the site — commonly at zero — and on-site generation has to be curtailed to stay under that cap rather than tripped when it is exceeded.
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 | — |
| TIE_KW | REAL | kW |
| GEN_KW | REAL | kW |
| MEAS_OK | BOOL | — |
| EXPORT_LIMIT | REAL | kW |
| MARGIN | REAL | kW |
| RELEASE_KW | REAL | kW |
| GEN_MAX_KW | REAL | kW |
| SAFE_LIMIT_KW | REAL | kW |
| RAMP_DN_PCT_S | REAL | %/s |
| RAMP_UP_PCT_S | REAL | %/s |
| OVER_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| CURTAIL | BOOL | — |
| GEN_LIMIT_KW | REAL | kW |
| LIMIT_PCT | REAL | % |
| EXPORT_KW | REAL | kW |
| OVER_KW | REAL | kW |
| VALID | BOOL | — |
| ALM_OVER_LIMIT | BOOL | — |
| ALM_OOS | BOOL | — |
| ALM_MEAS_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 146
- 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 EXPORT_LIMIT_GUARD — 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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