SPREADER_CTRL
Load-handling attachment sequencing — twistlock spreader, gripper or magnet — with landed proof and a lift permissive.
When to use it
Use SPREADER_CTRL when a crane picks its load through an attachment that has to be commanded and proven — a twistlock spreader, a gripper, a clamp or a lifting magnet — and the lift must not start until the attachment is proven engaged.
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 |
| PICK | BOOL |
| PLACE | BOOL |
| LOAD_PRESENT | BOOL |
| LANDED | BOOL |
| TWISTLOCK_FB | BOOL |
| UNLOCK_FB | BOOL |
| HOISTING | BOOL |
| SEAT_DLY | TIME |
| LOCK_TMO | TIME |
| FB_DLY | TIME |
| ACK | BOOL |
Outputs
| Port | Type |
|---|---|
| LOCK_CMD | BOOL |
| ATTACH_OK | BOOL |
| LIFT_PERMIT | BOOL |
| SEATED | BOOL |
| LOCKED | BOOL |
| RELEASED | BOOL |
| ALM_LOCK_TMO | BOOL |
| ALM_UNLOCK_TMO | BOOL |
| ALM_ATTACH_LOST | BOOL |
| ALM_NOT_LANDED | BOOL |
| ALM_CMD_CONFLICT | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
SPREADER_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
- 10
- Simulated scans
- 143
- 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 SPREADER_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.