MCB_CTRL
Mains breaker (52M) control with utility acceptance dwell, check-sync supervised close, backfeed protection and trip seal-in.
When to use it
Use MCB_CTRL when the utility breaker of a standby or paralleling installation is operated by the controller, and it must not close onto a supply that has not proven itself, nor onto a live bus without a check-sync, nor stay closed onto a failed utility while the generator is feeding the bus.
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 |
| CLOSE_REQ | BOOL |
| OPEN_REQ | BOOL |
| TRIP_REQ | BOOL |
| MAINS_OK | BOOL |
| SYNC_OK | BOOL |
| PERM | BOOL |
| BUS_LIVE | BOOL |
| ST_52G | BOOL |
| DEAD_BUS_EN | BOOL |
| OPEN_ON_MAINS_FAIL | BOOL |
| MAINS_FAIL_T | TIME |
| MAINS_OK_T | TIME |
| TCB | TIME |
| DEAD_BUS_T | TIME |
| FAIL_T | TIME |
| PULSE_T | TIME |
| ST_52A | BOOL |
| ST_52B | BOOL |
| ACK | BOOL |
Outputs
| Port | Type |
|---|---|
| CLOSE_CMD | BOOL |
| TRIP_CMD | BOOL |
| ST_CLOSED | BOOL |
| CLOSED | BOOL |
| OPENED | BOOL |
| POS | USINT |
| READY_TO_CLOSE | BOOL |
| MAINS_ACCEPTED | BOOL |
| SYNC_PERMIT | BOOL |
| DEAD_BUS_PERMIT | BOOL |
| FAILED | BOOL |
| ALM_TRIP_LOCKOUT | BOOL |
| ALM_POS_INVALID | BOOL |
| ALM_MAINS_FAIL | BOOL |
| BACKFEED_OPEN | BOOL |
| ALM_CFG_ERR | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
MCB_CTRL 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
- 139
- 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 MCB_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.