HOIST_CTRL
Hoist speed and brake sequencing with slack-rope, snatch-load, travel-limit and lift-inhibit supervision.
When to use it
Use HOIST_CTRL when a crane hoist is driven by a variable-speed drive with a holding brake, and the brake sequence, the slack-rope condition and the shock of a snatched pick have to be handled by the PLC.
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 | — |
| UP | BOOL | — |
| DOWN | BOOL | — |
| SPEED_REF | REAL | m/s |
| LOAD | REAL | kg |
| LOAD_OK | BOOL | — |
| HEIGHT | REAL | m |
| HEIGHT_OK | BOOL | — |
| SLACK | BOOL | — |
| TORQUE_OK | BOOL | — |
| HOIST_INHIBIT | BOOL | — |
| A_MAX | REAL | m/s2 |
| V_CREEP | REAL | m/s |
| TAUT_KG | REAL | kg |
| SHOCK_RATE | REAL | kg/s |
| FILT_T | TIME | — |
| TRQ_TMO | TIME | — |
| BRK_TMO | TIME | — |
| HGT_MAX | REAL | m |
| HGT_MIN | REAL | m |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| HOIST_SPD | REAL | m/s |
| BRAKE | BOOL | — |
| DRV_ENABLE | BOOL | — |
| SHOCK_LOAD | BOOL | — |
| MOVING | BOOL | — |
| LOAD_RATE | REAL | kg/s |
| ALM_TORQUE_FAIL | BOOL | — |
| ALM_SLACK | BOOL | — |
| ALM_AT_LIMIT | BOOL | — |
| ALM_LIFT_BLOCKED | BOOL | — |
| ALM_LOAD_FAULT | BOOL | — |
| ALM_HGT_FAULT | BOOL | — |
| ALM_CMD_CONFLICT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
HOIST_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
- 14
- Simulated scans
- 516
- 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 HOIST_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.