PUE_CALC
Power Usage Effectiveness — instantaneous and rolling, with a guarded denominator and an explicit validity bit.
When to use it
Use PUE_CALC when a facility-level power meter and an IT-level (UPS output or PDU) power meter are both available, and the site must report PUE live on a dashboard and as a smoothed value that does not swing with every chiller start.
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 | — |
| TOTAL_KW | REAL | kW |
| IT_KW | REAL | kW |
| PWR_OK | BOOL | — |
| IT_MIN_KW | REAL | kW |
| WINDOW | TIME | — |
| PUE_HI | REAL | kW/kW |
| PUE_DB | REAL | kW/kW |
| GAP_DLY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| PUE_INST | REAL | kW/kW |
| PUE_ROLL | REAL | kW/kW |
| VALID | BOOL | — |
| ALM_IT_LOW | BOOL | — |
| ALM_METER_FAULT | BOOL | — |
| ALM_IMPLAUSIBLE | BOOL | — |
| ALM_PUE_HIGH | BOOL | — |
| ALM_DATA_GAP | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 1200
- 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 PUE_CALC — 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.