PERFUSION_CTRL
Perfusion permeate and bleed rate control from vessel volumes per day, with a cell-density bleed trim and TMP flux protection.
When to use it
Use PERFUSION_CTRL when a perfusion bioreactor draws permeate through an ATF or TFF cell-retention device and bleeds cells to hold a steady-state density, and the filter has to be protected from the flux excursion that fouls it permanently.
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 | — |
| VVD_SP | REAL | vvd |
| VOLUME | REAL | L |
| VOL_OK | BOOL | — |
| BLEED_SP | REAL | vvd |
| VCD_PV | REAL | 1e6cells/mL |
| VCD_SP | REAL | 1e6cells/mL |
| VCD_OK | BOOL | — |
| VCD_CTRL | BOOL | — |
| KP | REAL | vvd per 1e6cells/mL |
| TI | REAL | s |
| BLEED_TRIM_MAX | REAL | vvd |
| TMP | REAL | bar |
| TMP_OK | BOOL | — |
| TMP_HI | REAL | bar |
| TMP_TRIP | REAL | bar |
| TMP_TMO | TIME | — |
| PERM_MAX | REAL | L/h |
| BLEED_MAX | REAL | L/h |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| PERM_RATE | REAL | L/h |
| BLEED_RATE | REAL | L/h |
| MEDIA_RATE | REAL | L/h |
| PERM_TOTAL_L | REAL | L |
| BLEED_TOTAL_L | REAL | L |
| FLUX_DERATE | REAL | % |
| VALID | BOOL | — |
| ALM_TMP_HI | BOOL | — |
| ALM_TMP_TRIP | BOOL | — |
| ALM_TMP_FAULT | BOOL | — |
| ALM_VOL_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
PERFUSION_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
- 9
- Simulated scans
- 318
- 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 PERFUSION_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.