DCW_CHEM_TANK_MON
Chemical day-tank / drum level supervision with measured consumption rate, days-of-supply forecasting and a staged dosing inhibit.
When to use it
Use DCW_CHEM_TANK_MON when a chemical day tank, IBC or drum feeds a metering pump and the pump must be stopped before the tank runs dry, or days-of-supply has to be reported so chemical is reordered before it runs out.
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 | — |
| LEVEL | REAL | % | L |
| LEVEL_IN_L | BOOL | — |
| LVL_OK | BOOL | — |
| TANK_CAP_L | REAL | L |
| REORDER_PCT | REAL | % |
| LOW_PCT | REAL | % |
| EMPTY_PCT | REAL | % |
| REFILL_BAND_PCT | REAL | % |
| AVG_WIN | TIME | — |
| MIN_RATE_LPH | REAL | L/h |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| VOLUME_L | REAL | L |
| PCT_FULL | REAL | % |
| RATE_LPH | REAL | L/h |
| DAYS_SUPPLY | REAL | d |
| SUPPLY_VALID | BOOL | — |
| DOSE_INHIBIT | BOOL | — |
| MON_DISABLED | BOOL | — |
| ALM_REORDER | BOOL | — |
| ALM_LOW | BOOL | — |
| ALM_EMPTY | BOOL | — |
| ALM_EMPTY_LATCHED | BOOL | — |
| ALM_LVL_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DCW_CHEM_TANK_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
- 13
- Simulated scans
- 19151
- 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_CHEM_TANK_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.