ENGINE_STOP_SEQ
Unload, cooldown and stop sequence with a pulsed stop solenoid, proven-at-rest confirmation and an emergency-stop bypass.
When to use it
Use ENGINE_STOP_SEQ when a turbocharged generator set has to be stopped after carrying load, so that the turbo bearings are given an unloaded cooling run before fuel is removed — and an emergency stop must still be able to bypass all of 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 | — |
| STOP | BOOL | — |
| ESTOP | BOOL | — |
| COOLDOWN | TIME | — |
| KW | REAL | kW |
| KW_OK | BOOL | — |
| UNLOAD_KW | REAL | kW |
| UNLOAD_TMO | TIME | — |
| RPM | REAL | rpm |
| RPM_OK | BOOL | — |
| STOPPED_RPM | REAL | rpm |
| STOP_TMO | TIME | — |
| SOL_T | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| FUEL | BOOL | — |
| STOP_SOL | BOOL | — |
| STOPPED | BOOL | — |
| STOPPING | BOOL | — |
| COOLING | BOOL | — |
| COOL_REM_S | REAL | s |
| STATE | USINT | — |
| ALM_UNLOAD_TMO | BOOL | — |
| ALM_STOP_FAIL | BOOL | — |
| ESTOP_LOCK | BOOL | — |
| ALM_RPM_FAULT | BOOL | — |
| ALM_KW_FAULT | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
ENGINE_STOP_SEQ 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
- 14
- Simulated scans
- 249
- 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 ENGINE_STOP_SEQ — 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.