CL2_DOSING_CTRL
Flow-paced hypochlorite dosing with bounded residual trim, overfeed cutoff and delivered-chlorine totalising.
When to use it
Use CL2_DOSING_CTRL when sodium hypochlorite (or another liquid chlorine donor) is fed to a treated-water main in proportion to metered flow, and a downstream residual analyser is available to trim the feed-forward dose.
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 | — |
| FLOW | REAL | m3/h |
| FLOW_OK | BOOL | — |
| DOSE_SP | REAL | mg/L |
| RESIDUAL_PV | REAL | mg/L |
| RESIDUAL_SP | REAL | mg/L |
| RES_OK | BOOL | — |
| STRENGTH_PCT | REAL | % |
| SOL_SG | REAL | kg/L |
| K_TRIM | REAL | %/min per mg/L |
| TRIM_MAX_PCT | REAL | % |
| FEED_MAX_LPH | REAL | L/h |
| MIN_FLOW | REAL | m3/h |
| RES_LO | REAL | mg/L |
| RES_MAX | REAL | mg/L |
| OVERFEED_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| FEED_RATE | REAL | L/h |
| FEED_PCT | REAL | % |
| FF_RATE | REAL | L/h |
| TRIM_PCT | REAL | % |
| DOSING | BOOL | — |
| ACH_DOSE | REAL | mg/L |
| CL2_TOTAL_KG | REAL | kg |
| ALM_RES_LOW | BOOL | — |
| ALM_OVERFEED | BOOL | — |
| ALM_TRIM_SAT | BOOL | — |
| ALM_RES_FAULT | BOOL | — |
| ALM_FLOW_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 1864
- 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 CL2_DOSING_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.