THICKENER_CTRL
Gravity thickener underflow pumping on blanket depth, with a blanket floor that stops the pump drawing supernatant and separate carryover and blocked-underflow alarms.
When to use it
Use THICKENER_CTRL when a gravity thickener or picket-fence thickener has its underflow drawn by a variable-speed pump, and the pump rate is set from a measured sludge-blanket depth rather than run on a timer.
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 | — |
| BLANKET_M | REAL | m |
| BLANKET_OK | BOOL | — |
| SP_M | REAL | m |
| TANK_DEPTH_M | REAL | m |
| KP | REAL | %/m |
| TI_S | REAL | s |
| MIN_PCT | REAL | % |
| MAX_PCT | REAL | % |
| MIN_BLANKET_M | REAL | m |
| FLOOR_HYST_M | REAL | m |
| HI_BLANKET_M | REAL | m |
| HI_TMO | TIME | — |
| MAX_RUN_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| UNDERFLOW_PCT | REAL | % |
| PUMP_CMD | BOOL | — |
| ERR_M | REAL | m |
| ALM_HIGH_BLANKET | BOOL | — |
| ALM_THIN_BLANKET | BOOL | — |
| ALM_MAX_RUN | BOOL | — |
| ALM_LVL_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
THICKENER_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
- 10
- Simulated scans
- 303
- 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 THICKENER_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.