DCW_DI_POLISH_MON
DI / mixed-bed polisher exhaustion monitoring by outlet quality, throughput and ionic load, with staged change-out warning, latched exhaustion divert and a channelling detector.
When to use it
Use DCW_DI_POLISH_MON when a mixed-bed or service-exchange DI polisher sits downstream of RO — for humidification make-up or any high-purity duty — and the bed's exhaustion has to be predicted early enough to order a replacement, and caught reliably enough that breakthrough never reaches the plant.
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 | — |
| MODE | INT | — |
| QUALITY | REAL | MOhm.cm or uS/cm |
| QUAL_OK | BOOL | — |
| FLOW | REAL | m3/h |
| FEED_COND | REAL | uS/cm |
| LOAD_FACTOR | REAL | mg/L per uS/cm |
| RATED_CAP | REAL | g CaCO3 |
| CAP_WARN_PCT | REAL | % |
| QUAL_WARN_USCM | REAL | uS/cm |
| QUAL_EXH_USCM | REAL | uS/cm |
| WARN_HYST_USCM | REAL | uS/cm |
| EXH_CONF_TIME | TIME | — |
| SAMPLE_TIME | TIME | — |
| MIN_SAMPLE_M3 | REAL | m3 |
| ROC_LIM | REAL | uS/cm per m3 |
| CHAN_CAP_PCT | REAL | % |
| RESET_BED | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| EC_OUT | REAL | uS/cm |
| QUAL_VALID | BOOL | — |
| THROUGHPUT_M3 | REAL | m3 |
| LOAD_G | REAL | g CaCO3 |
| CAP_REMAIN_PCT | REAL | % |
| CAP_VALID | BOOL | — |
| QUALITY_OK | BOOL | — |
| WARN_CHANGEOUT | BOOL | — |
| ALM_EXHAUSTED | BOOL | — |
| DIVERT_CMD | BOOL | — |
| TO_SERVICE | BOOL | — |
| ALM_CHANNEL | BOOL | — |
| ALM_QUAL_FAULT | BOOL | — |
| ALM_LOAD_FAULT | BOOL | — |
| DEGRAD_RATE | REAL | uS/cm per m3 |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DCW_DI_POLISH_MON 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
- 365
- 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 DCW_DI_POLISH_MON — 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.