DEWATER_POLYMER_TRIM
Dewatering polymer dose trimmed on centrate or filtrate clarity, bounded as a percentage of the feed-forward dose, with mass-flow totalising and a blind fallback to feed-forward.
When to use it
Use DEWATER_POLYMER_TRIM when a centrifuge or belt press is dosed with polymer at a dose set from the solids loading, and a centrate or filtrate turbidity measurement is available to trim that dose against the capture actually being achieved.
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 | — |
| RUNNING | BOOL | — |
| CENTRATE_NTU | REAL | NTU |
| NTU_OK | BOOL | — |
| NTU_SP | REAL | NTU |
| DOSE | REAL | kg/tDS |
| KP | REAL | %/NTU |
| TI_S | REAL | s |
| TRIM_UP_PCT | REAL | % |
| TRIM_DN_PCT | REAL | % |
| DOSE_MIN | REAL | kg/tDS |
| DOSE_MAX | REAL | kg/tDS |
| NTU_HI | REAL | NTU |
| FEED_TDS_H | REAL | t/h |
| HOLD_TMO | TIME | — |
| NTU_TMO | TIME | — |
| TRIM_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| DOSE_TRIM | REAL | kg/tDS |
| TRIM_PCT | REAL | % |
| POLY_KGH | REAL | kg/h |
| POLY_TOTAL_KG | REAL | kg |
| TRIMMING | BOOL | — |
| HELD | BOOL | — |
| ALM_HIGH_NTU | BOOL | — |
| ALM_TRIM_LIMIT | BOOL | — |
| ALM_NTU_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 11
- Simulated scans
- 620
- 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 DEWATER_POLYMER_TRIM — 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.