CRANE_OVERLOAD_PROT
Overload and load-moment supervision with a weigh delay, hysteresis and a latched raise inhibit that still permits lowering.
When to use it
Use CRANE_OVERLOAD_PROT when a crane has a load measurement — load cell, load pin or drive torque estimate — and the control system has to refuse a lift that exceeds the rated capacity, or the rated moment where capacity varies with geometry.
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 | — |
| LOAD | REAL | kg |
| LOAD_OK | BOOL | — |
| RATED | REAL | kg |
| MOMENT | REAL | kN.m |
| MOMENT_LIM | REAL | kN.m |
| MOMENT_OK | BOOL | — |
| MOM_ENABLE | BOOL | — |
| TRIP_PCT | REAL | % |
| WARN_PCT | REAL | % |
| HYST_PCT | REAL | % |
| WEIGH_DLY | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| OVERLOAD | BOOL | — |
| LIFT_INHIBIT | BOOL | — |
| LOAD_PCT | REAL | % |
| MOMENT_PCT | REAL | % |
| ALM_WARN | BOOL | — |
| ALM_MOMENT | BOOL | — |
| VALID | BOOL | — |
| ALM_LOAD_FAULT | BOOL | — |
| ALM_MOM_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
CRANE_OVERLOAD_PROT 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
- 128
- 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 CRANE_OVERLOAD_PROT — 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.