RADIANT_SLAB_CTRL
Radiant slab or panel valve control with zone reset, surface limits and dewpoint condensation protection.
When to use it
Use RADIANT_SLAB_CTRL when a heated or cooled slab, radiant panel or chilled ceiling is served by a modulating water valve, the surface temperature is measured, and — in cooling — the surface must be kept clear of the room dewpoint.
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 | — |
| SLAB_TEMP | REAL | degC |
| SLAB_OK | BOOL | — |
| SLAB_SP | REAL | degC |
| DEWPOINT | REAL | degC |
| DEW_OK | BOOL | — |
| ZONE_TEMP | REAL | degC |
| ZONE_OK | BOOL | — |
| ZONE_SP | REAL | degC |
| COOLING_MODE | BOOL | — |
| RESET_GAIN | REAL | K/K |
| RESET_LIMIT_K | REAL | K |
| SLAB_MAX_C | REAL | degC |
| SLAB_MIN_C | REAL | degC |
| COND_MARGIN_K | REAL | K |
| COND_HYST_K | REAL | K |
| COND_TMO | TIME | — |
| P_BAND_K | REAL | K |
| TI_S | REAL | s |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| VLV | REAL | % |
| COND_RISK | BOOL | — |
| EFF_SP | REAL | degC |
| ALM_COND_TRIP | BOOL | — |
| ALM_SLAB_LIMIT | BOOL | — |
| ALM_SENSOR | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| VALID | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
RADIANT_SLAB_CTRL 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
- 8
- Simulated scans
- 130
- 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 RADIANT_SLAB_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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Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.