DUCT_STATIC_CTRL
Duct static-pressure fan control with trim-and-respond setpoint reset, a fixed-speed sensor-failure fallback and a latched high-static trip.
When to use it
Use DUCT_STATIC_CTRL when a variable-speed supply or return fan holds a duct static pressure for a VAV system, and the setpoint should be reset downward on the zones' own pressure requests rather than held at the design value all year.
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 | — |
| DUCT_SP | REAL | Pa |
| DUCT_PV | REAL | Pa |
| PV_OK | BOOL | — |
| SP_RESET | REAL | Pa |
| TR_ENA | BOOL | — |
| REQUESTS | INT | — |
| IGNORE_REQ | INT | — |
| TRIM_PA | REAL | Pa |
| RESPOND_PA | REAL | Pa |
| MAX_RESPOND_PA | REAL | Pa |
| TR_PERIOD | TIME | — |
| KP | REAL | %/Pa |
| TI | TIME | — |
| OUT_MIN | REAL | % |
| OUT_MAX | REAL | % |
| FALLBACK_PCT | REAL | % |
| HI_LIMIT | REAL | Pa |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| FAN_SPEED | REAL | % |
| SP_ACTIVE | REAL | Pa |
| VALID | BOOL | — |
| AT_LIMIT | BOOL | — |
| ALM_PV_FAULT | BOOL | — |
| ALM_HIGH_STATIC | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Validation evidence
- Tests
- 9
- Simulated scans
- 684
- 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 DUCT_STATIC_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 and the datasheet.
Every block in the catalogue is free to download, in every format it ships, with no purchase and no card. Browsing needs no account at all; downloading needs a signed-in one, so the block lands in your library and re-downloads whenever you need it.
Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.