KWH_METER
Directional energy totaliser — net, exported and imported kWh plus kvarh — with a data-gap latch and a low-load (wet-stacking) alarm.
When to use it
Use KWH_METER when metered kW and kvar are available for a generator, incomer or feeder and energy has to be totalised for fuel accounting, rental billing or a duty record — and where a diesel set's time spent under-loaded needs to be visible.
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 | — |
| KW | REAL | kW |
| KVAR | REAL | kvar |
| CYCLE | TIME | — |
| KW_OK | BOOL | — |
| RATED_KW | REAL | kW |
| LOW_LOAD_PCT | REAL | % |
| LOW_LOAD_HYST_PCT | REAL | % |
| LOW_LOAD_TMO | TIME | — |
| SCAN_CFG_DLY | TIME | — |
| RESET | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| KWH | LREAL | kWh |
| KWH_EXP | LREAL | kWh |
| KWH_IMP | LREAL | kWh |
| KVARH | LREAL | kvarh |
| TOTALISING | BOOL | — |
| LOAD_PCT | REAL | % |
| LOAD_LOW | BOOL | — |
| LOAD_VALID | BOOL | — |
| ALM_LOW_LOAD | BOOL | — |
| ALM_DATA_GAP | BOOL | — |
| ALM_SCAN_CFG | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 11
- Simulated scans
- 1809
- 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 KWH_METER — 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.