VHP_CYCLE_CTRL
Vaporised hydrogen peroxide bio-decontamination cycle: condition, gas, dwell and aerate to a re-entry limit.
When to use it
Use VHP_CYCLE_CTRL when an isolator, RABS, airlock or room is bio-decontaminated with vaporised hydrogen peroxide and the cycle has to condition, hold an exposure, then aerate to a proven re-entry concentration before anyone opens the door.
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 | — |
| PPM_PV | REAL | ppm |
| PPM_OK | BOOL | — |
| RH_PV | REAL | %RH |
| RH_OK | BOOL | — |
| PPM_SP | REAL | ppm |
| COND_RH_SP | REAL | %RH |
| COND_TMO | TIME | — |
| DECON_T | TIME | — |
| DECON_TMO | TIME | — |
| AERATE_LIM | REAL | ppm |
| AER_HOLD | TIME | — |
| AERATE_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| PHASE | USINT | — |
| PPM | REAL | ppm |
| GEN_CMD | BOOL | — |
| DEHUM_CMD | BOOL | — |
| AERATE_CMD | BOOL | — |
| CYCLE_ACTIVE | BOOL | — |
| CYCLE_DONE | BOOL | — |
| SAFE_TO_ENTER | BOOL | — |
| PPM_VALID | BOOL | — |
| EXPOSURE_PPM_MIN | REAL | ppm.min |
| ALM_TMO | BOOL | — |
| ALM_ABORT | BOOL | — |
| ALM_PPM_FAULT | BOOL | — |
| ALM_REGAS | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
VHP_CYCLE_CTRL 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
- 9
- Simulated scans
- 379
- 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 VHP_CYCLE_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.