THERMAL_RUNAWAY_DET
Rack inlet thermal-runaway detector: windowed rise-rate measurement with multi-window confirmation, an absolute backstop, and a protective trip that will not release into a hot hall.
When to use it
Use THERMAL_RUNAWAY_DET when a hall has little thermal mass and a cooling or airflow failure raises rack inlet temperature by degrees per minute, and the site wants the IT load shed on the RATE of rise rather than waiting for an absolute limit that arrives too late to act on.
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 | — |
| T_IN | REAL | degC |
| T_OK | BOOL | — |
| RATE_C_MIN | REAL | degC/min |
| WINDOW | TIME | — |
| CONFIRM_WIN | INT | windows |
| T_ABS_TRIP | REAL | degC |
| ABS_DB | REAL | K |
| ABS_DLY | TIME | — |
| RANGE_LO | REAL | degC |
| RANGE_HI | REAL | degC |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| DTDT | REAL | degC/min |
| TRIP | BOOL | — |
| ALM_RATE | BOOL | — |
| ALM_ABS | BOOL | — |
| ALM_SENSOR_FAULT | BOOL | — |
| VALID | BOOL | — |
| T_PEAK | REAL | degC |
| OVER_WIN | UDINT | windows |
| ALM_CFG_ERR | BOOL | — |
Supervised control write
THERMAL_RUNAWAY_DET 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
- 11
- Simulated scans
- 159
- 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 THERMAL_RUNAWAY_DET — free
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