AIRSIDE_ECON_CTRL
Airside economiser — differential-enthalpy changeover with dry-bulb fallback, mixed-air low limit and an integrated-economiser permissive for mechanical cooling.
When to use it
Use AIRSIDE_ECON_CTRL when an air-handling unit has a modulating outdoor-air damper and free cooling has to be decided on a differential-enthalpy (or dry-bulb) comparison, with the mixed-air temperature protecting the coil and mechanical cooling held off until the damper is fully open.
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 | — |
| CLG_DEMAND | REAL | % |
| CLG_DEM_ON | REAL | % |
| OA_TEMP | REAL | °C |
| OA_OK | BOOL | — |
| OA_ENTH | REAL | kJ/kg |
| RA_ENTH | REAL | kJ/kg |
| ENTH_OK | BOOL | — |
| ENTH_MARGIN | REAL | kJ/kg |
| HIGH_LIM | REAL | °C |
| DB_K | REAL | K |
| MIN_OA | REAL | % |
| MA_TEMP | REAL | °C |
| MA_OK | BOOL | — |
| MA_SP | REAL | °C |
| MA_LOW_LIM | REAL | °C |
| MA_FREEZE | REAL | °C |
| MA_FREEZE_DLY | TIME | — |
| KP_MA | REAL | %/K |
| TI_MA | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| OA_DMPR | REAL | % |
| FREE_CLG | BOOL | — |
| SUITABLE | BOOL | — |
| MECH_CLG_ENA | BOOL | — |
| VALID | BOOL | — |
| ALM_MA_LOW | BOOL | — |
| ALM_MA_WARN | BOOL | — |
| ALM_ENTH_FAULT | BOOL | — |
| ALM_MA_FAULT | BOOL | — |
| ALM_OA_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 167
- 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 AIRSIDE_ECON_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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