AGITATION_CTRL
Agitator speed control limited by impeller tip speed and by power per unit volume, with stall detection.
When to use it
Use AGITATION_CTRL when an impeller in a bioreactor is driven from a speed setpoint that other loops (typically the DO cascade) are allowed to push around, and the shear the culture sees has to be limited in the controller rather than trusted to the operator.
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 | — |
| RPM_SP | REAL | rpm |
| RPM_PV | REAL | rpm |
| RPM_OK | BOOL | — |
| TIP_SPEED_MAX | REAL | m/s |
| IMPELLER_D_M | REAL | m |
| VOLUME_L | REAL | L |
| RHO | REAL | kg/m3 |
| NP | REAL | - |
| POWER_MAX_W_M3 | REAL | W/m3 |
| RPM_MAX | REAL | rpm |
| RPM_MIN | REAL | rpm |
| KP | REAL | %/rpm |
| TI | REAL | s |
| STALL_RPM | REAL | rpm |
| STALL_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| SPEED_PCT | REAL | % |
| POWER_W_M3 | REAL | W/m3 |
| RPM_LIM | REAL | rpm |
| TIP_SPEED | REAL | m/s |
| VALID | BOOL | — |
| ALM_TIP_LIMIT | BOOL | — |
| ALM_PV_LIMIT | BOOL | — |
| ALM_STALL | BOOL | — |
| ALM_RPM_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 7
- Simulated scans
- 60
- 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 AGITATION_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.