CLEANROOM_PRESS_CASCADE
Cleanroom differential-pressure cascade control with low-DP and cascade-reversal protection.
When to use it
Use CLEANROOM_PRESS_CASCADE when a classified room, airlock or change room is held at a differential pressure to the space next to it by a modulating supply or extract damper, and the direction of that cascade is a licence commitment that may never reverse.
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 | — |
| ROOM_DP | REAL | Pa |
| DP_OK | BOOL | — |
| DP_SP | REAL | Pa |
| DP_MIN | REAL | Pa |
| DP_MAX | REAL | Pa |
| DP_REV | REAL | Pa |
| BIAS_PCT | REAL | % |
| KP | REAL | %/Pa |
| TI_S | REAL | s |
| DLY | TIME | — |
| DOOR_OPEN | BOOL | — |
| MAN | BOOL | — |
| MAN_PCT | REAL | % |
| FAIL_PCT | REAL | % |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| DAMPER_PCT | REAL | % |
| CASCADE_OK | BOOL | — |
| DP_FILT | REAL | Pa |
| ALM_DP_LOW | BOOL | — |
| ALM_REVERSAL | BOOL | — |
| ALM_DP_HIGH | BOOL | — |
| ALM_DP_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| DP_LOW_MINUTES | REAL | min |
| DOOR_MINUTES | REAL | min |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 11
- Simulated scans
- 1111
- 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 CLEANROOM_PRESS_CASCADE — 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.