LOOP_SANITIZATION
Thermal or ozone loop sanitisation sequence with return-gated hold accumulation and a return-to-service phase.
When to use it
Use LOOP_SANITIZATION when a purified-water or WFI distribution loop is sanitised periodically — hot water above 80 degC, or an ozone residual held through the loop — and the cycle must prove time at condition at the loop RETURN before the loop is given back to production.
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 | — |
| START | BOOL | — |
| ABORT | BOOL | — |
| SUPPLY_PV | REAL | degC or mV |
| RETURN_PV | REAL | degC or mV |
| PV_OK | BOOL | — |
| FLOW_OK | BOOL | — |
| SP | REAL | degC or mV |
| HOLD_T | TIME | — |
| RETURN_MIN | REAL | degC or mV |
| CHARGE_TMO | TIME | — |
| RELEASE_MAX | REAL | degC or mV |
| MODE_OZONE | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| PHASE | USINT | — |
| HEATING | BOOL | — |
| HOLD | BOOL | — |
| DONE | BOOL | — |
| FAIL | BOOL | — |
| HEAT_CMD | BOOL | — |
| OZONE_CMD | BOOL | — |
| USE_INHIBIT | BOOL | — |
| HOLD_S | REAL | s |
| ALM_CHARGE_TMO | BOOL | — |
| ALM_HOLD_INTERRUPTED | BOOL | — |
| ALM_PV_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
LOOP_SANITIZATION 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
- 12
- Simulated scans
- 558
- 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 LOOP_SANITIZATION — 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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