GARAGE_CO_EXHAUST
Parking-garage CO/NO2 exhaust ventilation with matched supply, purge run-on, a fail-safe FLOOR on fan speed and a latched evacuation horn.
When to use it
Use GARAGE_CO_EXHAUST when a parking garage, loading dock or plant room is ventilated on measured contaminant level rather than continuously, with modulating or staged exhaust and a matched supply fan.
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 | — |
| CO_PPM | REAL | ppm |
| CO_OK | BOOL | — |
| NO2_PPM | REAL | ppm |
| NO2_OK | BOOL | — |
| CO_LIM | REAL | ppm |
| NO2_LIM | REAL | ppm |
| START_FRAC | REAL | fraction |
| MIN_SPEED_PCT | REAL | % |
| SUP_RATIO | REAL | fraction |
| FAILSAFE_PCT | REAL | % |
| MIN_RUN | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| EXH_FAN | REAL | % |
| SUP_FAN | REAL | % |
| ALARM_HORN | BOOL | — |
| FANS_RUN | BOOL | — |
| ALM_CO_HIGH | BOOL | — |
| ALM_NO2_HIGH | BOOL | — |
| ALM_SENS_FAULT | BOOL | — |
| DEM_VALID | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
GARAGE_CO_EXHAUST 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
- 121
- 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 GARAGE_CO_EXHAUST — 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.