PREHEAT_CTRL
Jacket-water heater thermostat with a running-engine inhibit, heater-failure proving and duty-hour accounting.
When to use it
Use PREHEAT_CTRL when a standby generator set has a jacket-water block heater that must keep the engine warm enough to accept load on the first start — the NFPA 110 / ISO 8528 warm-start requirement — and the failure of that heater must be discovered before the outage, not during it.
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 | — |
| COOL_T | REAL | degC |
| TEMP_OK | BOOL | — |
| ON_T | REAL | degC |
| OFF_T | REAL | degC |
| LOW_ALM_T | REAL | degC |
| LOW_ALM_HYST | REAL | degC |
| ENGINE_RUN | BOOL | — |
| HEAT_TMO | TIME | — |
| MIN_RISE | REAL | degC |
| HFAIL_ACTION | BOOL | — |
| HFAIL_RETRY_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| HEATER | BOOL | — |
| READY | BOOL | — |
| ALM_LOW_TEMP | BOOL | — |
| ALM_HEATER_FAIL | BOOL | — |
| ALM_TEMP_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| HEATER_HOURS | REAL | h |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 12
- Simulated scans
- 936
- 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 PREHEAT_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, the IEC 61499 function block type (.fbt) and the datasheet.
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Source is never published on this page. The implementation is released to a signed-in Ri Tech account — free of charge, but never anonymously.