DCW_SIDESTREAM_FILTER
Side-stream / basin-sweeper filter supervision with a three-criterion backwash request and header lockout.
When to use it
Use DCW_SIDESTREAM_FILTER when a cooling-tower basin is kept swept by a side-stream sand, multimedia or screen filter that has to be backwashed periodically, and the wash has to be requested rather than started — because several filters share one backwash header.
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 | — |
| RUN_PERMIT | BOOL | — |
| FLOW | REAL | m3/h |
| FLOW_OK | BOOL | — |
| MIN_FLOW | REAL | m3/h |
| FLOW_HYST | REAL | m3/h |
| DP_BAR | REAL | bar |
| DP_OK | BOOL | — |
| DP_TRIP_BAR | REAL | bar |
| DP_RESET_BAR | REAL | bar |
| DP_HIGH_BAR | REAL | bar |
| DP_FILT_T | TIME | — |
| DP_ARM_T | TIME | — |
| RUNTIME_LIMIT | TIME | — |
| VOLUME_LIMIT_M3 | REAL | m3 |
| FLOW_FAIL_T | TIME | — |
| CLEAN_PROOF_T | TIME | — |
| LOCKOUT | BOOL | — |
| WASH_ACTIVE | BOOL | — |
| WASH_DONE | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| FILTER_RUN_CMD | BOOL | — |
| IN_SERVICE | BOOL | — |
| BW_REQUEST | BOOL | — |
| REQ_BY_DP | BOOL | — |
| REQ_BY_TIME | BOOL | — |
| REQ_BY_VOLUME | BOOL | — |
| SERVICE_H | REAL | h |
| SERVICE_VOL_M3 | REAL | m3 |
| LOAD_PCT | REAL | % |
| WASH_COUNT | DINT | — |
| ALM_DP_HIGH | BOOL | — |
| ALM_DP_FAULT | BOOL | — |
| ALM_FLOW_FAULT | BOOL | — |
| ALM_NO_FLOW | BOOL | — |
| ALM_WASH_INEFF | BOOL | — |
| ALM_NO_CRITERION | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
DCW_SIDESTREAM_FILTER 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
- 17
- Simulated scans
- 523
- 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_SIDESTREAM_FILTER — 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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