STAIR_PRESS_CTRL
Stairwell pressurisation with anti-windup PI fan control, over-pressure relief modulation and latched code-window trouble.
When to use it
Use STAIR_PRESS_CTRL when a stair shaft is pressurised on a fire-alarm command through a variable-speed fan and a modulating relief damper, and the differential pressure has to be held inside a code window while doors open and close.
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 |
|---|---|---|
| ACTIVATE | BOOL | — |
| DP | REAL | Pa |
| DP_OK | BOOL | — |
| DP_SP | REAL | Pa |
| DOOR_OPEN | BOOL | — |
| DP_MIN | REAL | Pa |
| DP_MAX | REAL | Pa |
| KP | REAL | %/Pa |
| TI | REAL | s |
| MIN_SPEED_PCT | REAL | % |
| DOOR_SPEED_PCT | REAL | % |
| FAILSAFE_PCT | REAL | % |
| FAILSAFE_RELIEF_PCT | REAL | % |
| TROUBLE_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| FAN_SPEED | REAL | % |
| RELIEF_DMPR | REAL | % |
| ACTIVE | BOOL | — |
| DP_IN_BAND | BOOL | — |
| CTRL_VALID | BOOL | — |
| ALM_DP_LOW | BOOL | — |
| ALM_DP_HIGH | BOOL | — |
| ALM_DP_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 9
- Simulated scans
- 341
- 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 STAIR_PRESS_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.