POLYMER_BLEND_CTRL
Polymer make-down and solution dosing paced to the dry-solids loading, with make-down and feed-pump capacity checks.
When to use it
Use POLYMER_BLEND_CTRL when an emulsion or solution polymer is made down with dilution water and fed to a thickener, belt press, centrifuge or dewatering unit, and the dose must be held per dry tonne rather than per cubic metre of sludge.
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 | — |
| SLUDGE_FLOW | REAL | m3/h |
| FLOW_OK | BOOL | — |
| SLUDGE_TS_PCT | REAL | % |
| TS_OK | BOOL | — |
| FALLBACK_TS_PCT | REAL | % |
| DOSE_KG_T | REAL | kg/t |
| NEAT_RATE | REAL | L/h |
| DILUTION | REAL | ratio |
| NEAT_ACTIVE_PCT | REAL | % |
| NEAT_SG | REAL | kg/L |
| SOL_MAX_LPH | REAL | L/h |
| MIN_FLOW | REAL | m3/h |
| LIMIT_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| SOLUTION_RATE | REAL | L/h |
| NEAT_LPH | REAL | L/h |
| DIL_WATER_LPH | REAL | L/h |
| SOL_CONC_GPL | REAL | g/L |
| DS_KG_H | REAL | kg/h |
| ACH_DOSE_KG_T | REAL | kg/t |
| DOSE_VALID | BOOL | — |
| DOSING | BOOL | — |
| POLY_TOTAL_KG | REAL | kg |
| MAKEDOWN_SAT | BOOL | — |
| FEED_SAT | BOOL | — |
| ALM_UNDERDOSE | BOOL | — |
| ALM_FLOW_FAULT | BOOL | — |
| ALM_TS_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
POLYMER_BLEND_CTRL commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 11
- Simulated scans
- 852
- 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 POLYMER_BLEND_CTRL — 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.