SIP_7SD_LDIF
SIPROTEC-shaped two-ended line current differential (ANSI 87L): the same per-phase dual-slope restraint as the transformer element, plus telecommunication-channel supervision that blocks the protection when the remote end cannot be seen.
When to use it
Use SIP_7SD_LDIF when a two-ended line or cable differential scheme over a fibre or IEEE C37.94 channel has to be modelled or supervised in the PLC — as a settings and channel-availability study, as the protection model in a network simulation, or as the alarm and reporting layer around a real 87L.
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 |
|---|---|---|
| IlocA | REAL | x In |
| IlocB | REAL | x In |
| IlocC | REAL | x In |
| IremA | REAL | x In |
| IremB | REAL | x In |
| IremC | REAL | x In |
| ENABLE | BOOL | — |
| MEAS_OK | BOOL | — |
| CH_RX | BOOL | — |
| CH_ERR | BOOL | — |
| CH_DELAY | REAL | ms |
| CH_DELAY_MAX | REAL | ms |
| CH_TMO | TIME | — |
| CH_AVG_S | REAL | s |
| IDIFF_MIN | REAL | x In |
| SLP1 | REAL | p.u. |
| SLP2 | REAL | p.u. |
| IREST_BP | REAL | x In |
| IDIFF_HS | REAL | x In |
| T_OP | TIME | — |
| BLK | BOOL | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| TRIP | BOOL | — |
| Idiff | REAL | x In |
| chOK | BOOL | — |
| Irest | REAL | x In |
| TRIP_UNRES | BOOL | — |
| PICKUP | BOOL | — |
| PHASE | INT | — |
| CH_AVAIL_PCT | REAL | % |
| CH_WIN_S | REAL | s |
| BLOCKED | BOOL | — |
| ALM_CH_FAIL | BOOL | — |
| ALM_MEAS_FAIL | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
SIP_7SD_LDIF 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
- 1226
- 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 SIP_7SD_LDIF — 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.