DCW_INHIBITOR_DOSE
Makeup-flow-paced scale and corrosion inhibitor dosing with stroke and pulse outputs, consumption totalising and undersized-pump detection.
When to use it
Use DCW_INHIBITOR_DOSE when scale/corrosion inhibitor is fed to a cooling-tower circuit in proportion to metered makeup water rather than on a timer, and the metering pump takes either a 0-100 % speed/stroke reference or a pulse input.
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 | — |
| MAKEUP_FLOW | REAL | m3/h |
| FLOW_OK | BOOL | — |
| DOSE_INHIBIT | BOOL | — |
| TARGET_DOSE | REAL | mg/L |
| PROD_SG | REAL | kg/L |
| PUMP_CAP_LPH | REAL | L/h |
| MAX_STROKE_PCT | REAL | % |
| MIN_FLOW | REAL | m3/h |
| PULSE_PERIOD | TIME | — |
| CLAMP_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| STROKE_PCT | REAL | % |
| PULSE_CMD | BOOL | — |
| DOSING | BOOL | — |
| DEMAND_LPH | REAL | L/h |
| ACH_DOSE | REAL | mg/L |
| CHEM_TOTAL_L | REAL | L |
| ALM_MAX_CLAMP | BOOL | — |
| ALM_FLOW_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DCW_INHIBITOR_DOSE 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
- 1056
- 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_INHIBITOR_DOSE — 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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