CO_NOX_MON
Tunnel air-quality monitor — CO, NO2 and visibility validated for range and liveness, driving one ventilation demand and latched limit alarms.
When to use it
Use CO_NOX_MON when a tunnel section carries CO, NO2 and opacity/visibility analysers whose readings must be quality-checked before they are allowed to drive ventilation, and whose limit excursions must be annunciated and accumulated.
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 | — |
| PARAMS | STRING | — |
| CO_RAW | REAL | ppm |
| CO_OK | BOOL | — |
| CO_FS | REAL | ppm |
| CO_LIM | REAL | ppm |
| NO2_RAW | REAL | ppm |
| NO2_OK | BOOL | — |
| NO2_FS | REAL | ppm |
| NO2_LIM | REAL | ppm |
| VIS_RAW | REAL | % |
| VIS_OK | BOOL | — |
| VIS_LIM | REAL | % |
| FREEZE_BAND_PCT | REAL | % |
| FREEZE_TMO | TIME | — |
| ALM_DLY | TIME | — |
| FAIL_DEMAND_PCT | REAL | % |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| CO_PPM | REAL | ppm |
| NO2_PPM | REAL | ppm |
| VIS_PCT | REAL | % |
| OK | BOOL | — |
| CO_VALID | BOOL | — |
| NO2_VALID | BOOL | — |
| VIS_VALID | BOOL | — |
| VENT_DEMAND_PCT | REAL | % |
| CO_EXCEED_S | REAL | s |
| ALM_CO_HIGH | BOOL | — |
| ALM_NO2_HIGH | BOOL | — |
| ALM_VIS_LOW | BOOL | — |
| ALM_SENSOR_FAULT | BOOL | — |
| ALM_FROZEN | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 11
- Simulated scans
- 228
- 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 CO_NOX_MON — 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.