OPEN_XFER
Open-transition (break-before-make) transfer with a dead time proven from the outgoing breaker's position, not from its open command.
When to use it
Use OPEN_XFER when a load has to move between the utility and the generator with no parallel at any instant, and the incoming source must not close until the outgoing one is proven open and the bus has been dead long enough for motor residual voltage to decay.
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 |
|---|---|
| ENABLE | BOOL |
| START | BOOL |
| DIRECTION | BOOL |
| MAINS_OK | BOOL |
| GEN_READY | BOOL |
| ST_52G | BOOL |
| ST_52M | BOOL |
| DEAD_T | TIME |
| OPEN_TMO | TIME |
| CLOSE_TMO | TIME |
| ACK | BOOL |
Outputs
| Port | Type | Unit |
|---|---|---|
| IN_PROGRESS | BOOL | — |
| DEAD_BUS | BOOL | — |
| DONE | BOOL | — |
| FAILED | BOOL | — |
| CLOSE_52G | BOOL | — |
| OPEN_52G | BOOL | — |
| CLOSE_52M | BOOL | — |
| OPEN_52M | BOOL | — |
| DEAD_ELAPSED_S | REAL | s |
| ALM_OPEN_FAIL | BOOL | — |
| ALM_CLOSE_FAIL | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
OPEN_XFER 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
- 9
- Simulated scans
- 167
- 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 OPEN_XFER — free
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