HUMIDITY_CTRL
Dew-point band humidity control with a wide deadband, minimum mode dwell, mutually exclusive humidify/dehumidify and an allowable-envelope latch.
When to use it
Use HUMIDITY_CTRL when a data hall's moisture has to be held inside the ASHRAE dew-point envelope, and the units serving it must not be allowed to fight each other by humidifying and dehumidifying at the same time.
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 | REAL | degC |
| RH | REAL | % |
| SENS_OK | BOOL | — |
| DP_LO | REAL | degC |
| DP_HI | REAL | degC |
| RH_HI | REAL | % |
| HYST_K | REAL | K |
| RH_HYST_PCT | REAL | % |
| MIN_DWELL | TIME | — |
| ALLOW_DP_LO | REAL | degC |
| ALLOW_DP_HI | REAL | degC |
| ENV_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| HUMIDIFY | BOOL | — |
| DEHUM | BOOL | — |
| DEWPOINT | REAL | degC |
| VALID | BOOL | — |
| ALM_SENS_FAULT | BOOL | — |
| ALM_CONFLICT | BOOL | — |
| ALM_ENVELOPE | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 8
- Simulated scans
- 282
- 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 HUMIDITY_CTRL — free
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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.