DMA_LEAK_BALANCE
District-metered-area minimum-night-flow leak detection with settled sampling window, consecutive-night confirmation and daily loss estimation.
When to use it
Use DMA_LEAK_BALANCE when a district-metered area's inlet flow is logged and the minimum night flow is the leakage indicator — the standard IWA method for deciding which district gets the next leak-detection crew.
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 | — |
| INFLOW | REAL | m3/h |
| FLOW_OK | BOOL | — |
| NIGHT | BOOL | — |
| BILLED_EST | REAL | m3/h |
| MNF_LIMIT | REAL | m3/h |
| INFLOW_MIN | REAL | m3/h |
| SETTLE | TIME | — |
| SAMPLE_WIN | TIME | — |
| CONF_NIGHTS | INT | — |
| NDF_H | REAL | h/d |
| STALE_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| MNF | REAL | m3/h |
| NET_NIGHT | REAL | m3/h |
| LOSS_EST_M3_D | REAL | m3/d |
| LEAK_SUSPECT | BOOL | — |
| NIGHTS_OVER | INT | — |
| WINDOW_ACTIVE | BOOL | — |
| VALID | BOOL | — |
| ALM_FLOW_FAULT | BOOL | — |
| ALM_STALE | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 265
- 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 DMA_LEAK_BALANCE — 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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