END_TRAVEL_LIMIT
End-of-travel slowdown and stop limit for one end of a travel axis, with over-travel latch and recovery at creep.
When to use it
Use END_TRAVEL_LIMIT when a long-travel, cross-travel or hoist axis runs to a physical end of runway and the motion controller's speed reference must be clamped to creep at a slowdown point and to zero at a stop point, independently of the profile the controller is executing.
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 | — |
| POS | REAL | m |
| POS_OK | BOOL | — |
| SLOWDOWN_PT | REAL | m |
| STOP_PT | REAL | m |
| DIR | BOOL | — |
| CREEP_PCT | REAL | % |
| OVERTRAVEL_TOL | REAL | m |
| POS_HYST | REAL | m |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| SPEED_LIM_PCT | REAL | % |
| AT_LIMIT | BOOL | — |
| STOP_TOWARD_END | BOOL | — |
| SLOWDOWN | BOOL | — |
| TOWARD_END | BOOL | — |
| ALM_OVERTRAVEL | BOOL | — |
| ALM_POS_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
END_TRAVEL_LIMIT 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
- 11
- Simulated scans
- 114
- 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 END_TRAVEL_LIMIT — 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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