KW_DISPATCH
Load-demand dispatch: how many sets the plant needs online to hold its reserve margin, with a stop test that cannot oscillate.
When to use it
Use KW_DISPATCH when a multi-set plant runs only as many machines as the load needs, and the controller has to decide when to bring the next set on and — the harder half — when it is genuinely safe to take one off.
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 | — |
| PLANT_KW | REAL | kW |
| KW_OK | BOOL | — |
| ONLINE_CAP | REAL | kW |
| CAP_OK | BOOL | — |
| NEXT_CAP | REAL | kW |
| N_ONLINE | USINT | — |
| N_AVAIL | USINT | — |
| N_MIN | USINT | — |
| START_PCT | REAL | % |
| STOP_PCT | REAL | % |
| RESTART_MARGIN_PCT | REAL | % |
| DELAY | TIME | — |
| STOP_DELAY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| N_REQUIRED | USINT | — |
| START_NEXT | BOOL | — |
| STOP_LAST | BOOL | — |
| LOADING_PCT | REAL | % |
| PROJ_PCT | REAL | % |
| RESERVE_KW | REAL | kW |
| STOP_BLOCKED | BOOL | — |
| VALID | BOOL | — |
| ALM_NO_CAPACITY | BOOL | — |
| ALM_MEAS_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
KW_DISPATCH 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
- 10
- Simulated scans
- 236
- 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 KW_DISPATCH — 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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