SYNC_MEAS
Differential measurement across a breaker — delta-V, slip and phase angle — with a three-term close permissive and a separate dead-bus case.
When to use it
Use SYNC_MEAS when a generator or incoming supply is to be paralleled onto a live bus through a breaker, and the closing device needs the differential measurement plus a permissive that is only true when the voltage, slip and phase-angle windows all hold at once.
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 | — |
| GEN_V | REAL | V |
| GEN_F | REAL | Hz |
| GEN_ANG | REAL | deg |
| BUS_V | REAL | V |
| BUS_F | REAL | Hz |
| BUS_ANG | REAL | deg |
| GEN_OK | BOOL | — |
| BUS_OK | BOOL | — |
| V_NOM | REAL | V |
| DV_MAX_PCT | REAL | % |
| SLIP_MIN_HZ | REAL | Hz |
| SLIP_MAX_HZ | REAL | Hz |
| ANG_MAX_DEG | REAL | deg |
| BRK_CLOSE_TIME | TIME | — |
| SYNC_DWELL | TIME | — |
| LIVE_PCT | REAL | % |
| DEAD_BUS_PCT | REAL | % |
| DEAD_BUS_EN | BOOL | — |
| SYNC_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| DV | REAL | V |
| SLIP | REAL | Hz |
| DANG | REAL | deg |
| DV_PCT | REAL | % |
| ANG_PRED_DEG | REAL | deg |
| DV_IN_WIN | BOOL | — |
| SLIP_IN_WIN | BOOL | — |
| ANG_IN_WIN | BOOL | — |
| GEN_LIVE | BOOL | — |
| BUS_LIVE | BOOL | — |
| DEAD_BUS | BOOL | — |
| IN_SYNC | BOOL | — |
| DEAD_BUS_PERM | BOOL | — |
| CLOSE_PERM | BOOL | — |
| VALID | BOOL | — |
| ALM_SYNC_TMO | BOOL | — |
| ALM_MEAS_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
Supervised control write
SYNC_MEAS 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
- 109
- 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
Download SYNC_MEAS — 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 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.