CHAMBER_PRESS_CTRL
Chamber-pressure PI loop on the sterile inert-gas bleed, fail-closed, with deadband, conditional-integration anti-windup and a loss-of-vacuum latch.
When to use it
Use CHAMBER_PRESS_CTRL when freeze-dryer chamber pressure is held above the pump/condenser's natural pull-down by bleeding sterile nitrogen through a control valve, and the loop must fail closed.
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 | — |
| P_SP | REAL | Pa |
| P_PV | REAL | Pa |
| P_OK | BOOL | — |
| P_MIN_CRED | REAL | Pa |
| KP | REAL | %/Pa |
| TI | REAL | s |
| DB_PA | REAL | Pa |
| OUT_MIN | REAL | % |
| OUT_MAX | REAL | % |
| P_MAX | REAL | Pa |
| P_HI_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| BLEED_PCT | REAL | % |
| ERR_PA | REAL | Pa |
| AT_LIMIT | BOOL | — |
| VALID | BOOL | — |
| ALM_P_FAULT | BOOL | — |
| ALM_P_HIGH | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 8
- Simulated scans
- 488
- 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 CHAMBER_PRESS_CTRL — free
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