FAN_WALL_CTRL
Fan-wall N+1 speed sharing with failed-fan compensation, a slew limit, and latched redundancy and capacity alarms.
When to use it
Use FAN_WALL_CTRL when an EC fan array serves an air handler or a data hall with N+1 redundancy, each fan reports its own health, and the surviving fans must take up a failed fan's share without a step change in airflow.
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 | — |
| N_FANS | USINT | — |
| SP_PCT | REAL | % |
| F1_OK | BOOL | — |
| F2_OK | BOOL | — |
| F3_OK | BOOL | — |
| F4_OK | BOOL | — |
| F5_OK | BOOL | — |
| F6_OK | BOOL | — |
| SPD_MIN | REAL | % |
| SPD_MAX | REAL | % |
| RAMP_PCT_PER_S | REAL | %/s |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| N_OK | USINT | — |
| N_LOST | USINT | — |
| SPEED_PCT | REAL | % |
| DEMAND_PCT | REAL | % |
| ALM_REDUNDANCY_LOST | BOOL | — |
| ALM_ALL_FAILED | BOOL | — |
| ALM_CAPACITY_LOST | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Validation evidence
- Tests
- 9
- Simulated scans
- 270
- 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 FAN_WALL_CTRL — free
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