CHEM_FEED_PUMP
Metering pump stroke and speed control with turndown handling and a draw-down calibration that corrects the delivered rate.
When to use it
Use CHEM_FEED_PUMP when a diaphragm metering pump takes a stroke-length and a stroke-rate (or speed) reference, and the plant proves its output periodically against a calibration column.
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 | — |
| RATE_SP | REAL | mL/min |
| PUMP_OK | BOOL | — |
| CAP_ML_MIN | REAL | mL/min |
| STROKE_MAX | REAL | % |
| STROKE_MIN | REAL | % |
| SPEED_MIN | REAL | % |
| CAL_REQ | BOOL | — |
| CAL_VOL_ML | REAL | mL |
| CAL_END | BOOL | — |
| CAL_TOL_PCT | REAL | % |
| CAL_FACTOR_INIT | REAL | ratio |
| CAL_RESTORE | BOOL | — |
| OVER_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| STROKE_PCT | REAL | % |
| SPEED_PCT | REAL | % |
| ML_MIN | REAL | mL/min |
| RUNNING | BOOL | — |
| CAL_FACTOR | REAL | ratio |
| CAL_ERR_PCT | REAL | % |
| CAL_ACTIVE | BOOL | — |
| CAL_VALID | BOOL | — |
| ALM_OVER_CAP | BOOL | — |
| ALM_BELOW_TURNDOWN | BOOL | — |
| ALM_CAL_FAIL | BOOL | — |
| ALM_PUMP_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 815
- 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 CHEM_FEED_PUMP — 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.