ASHRAE_ENVELOPE
ASHRAE class A1–A4 allowable-envelope check on IT inlet air, with dew-point limit, temperature margin and latched excursion.
When to use it
Use ASHRAE_ENVELOPE when the IT inlet condition of a hall or containment aisle has to be proven inside the ASHRAE thermal-guidelines allowable envelope for the class of equipment installed, and an excursion has to be recorded even after the hall recovers.
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 | — |
| T_IN | REAL | °C |
| RH_IN | REAL | % |
| CLASS | USINT | — |
| T_OK | BOOL | — |
| RH_OK | BOOL | — |
| HYST_C | REAL | K |
| HYST_RH | REAL | % |
| HYST_DP | REAL | K |
| EXC_DLY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| IN_ENV | BOOL | — |
| MARGIN_C | REAL | K |
| MARGIN_LO_C | REAL | K |
| MARGIN_HI_C | REAL | K |
| IN_RECOMMENDED | BOOL | — |
| DP_C | REAL | °C |
| T_LIMIT_LO_C | REAL | °C |
| T_LIMIT_HI_C | REAL | °C |
| ALM_T_HIGH | BOOL | — |
| ALM_T_LOW | BOOL | — |
| ALM_RH_HIGH | BOOL | — |
| ALM_RH_LOW | BOOL | — |
| ALM_DP_HIGH | BOOL | — |
| ALM_DP_LOW | BOOL | — |
| ALM_EXCURSION | BOOL | — |
| ALM_SENSOR_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| VALID | BOOL | — |
Validation evidence
- Tests
- 14
- Simulated scans
- 144
- 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
Download ASHRAE_ENVELOPE — free
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