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 | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
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
- Conforms to IEC 61499
Download DUCT_STATIC_CTRL — free
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