CWS_TEMP_RESET
Chilled-water supply temperature reset from the worst-case coil valve position, rate-limited and clamped, failing to the coldest setpoint.
When to use it
Use CWS_TEMP_RESET when a chilled-water plant serves coils whose valve positions are polled, and the supply temperature should be raised for plant efficiency only as far as the most-open valve allows.
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 | — |
| VALVE_MAX_PCT | REAL | % |
| VALVE_OK | BOOL | — |
| VALVE_PLAUS_LO | REAL | % |
| SP_MIN | REAL | degC |
| SP_MAX | REAL | degC |
| VALVE_HI_PCT | REAL | % |
| VALVE_LO_PCT | REAL | % |
| RATE_K_PER_MIN | REAL | K/min |
| HOLD | BOOL | — |
| NO_CAP_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| CWS_SP | REAL | degC |
| RESETTING | BOOL | — |
| AT_MIN | BOOL | — |
| AT_MAX | BOOL | — |
| ALM_NO_CAPACITY | BOOL | — |
| ALM_VALVE_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 8
- Simulated scans
- 1046
- 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 CWS_TEMP_RESET — free
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