WCS_DISPATCHER
WCS task dispatch — one task per request to the best-placed available machine, with round-robin aisle balancing.
When to use it
Use WCS_DISPATCHER when a queue of ready warehouse tasks has to be handed one at a time to whichever crane, shuttle or AGV is idle and in range, and the same task must never be given to two machines.
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 |
| REQ | BOOL |
| TASK_Q | UINT |
| HEAD_TASK | UINT |
| EQ_STATUS | UINT |
| EQ_COUNT | USINT |
| PRIORITY | USINT |
| MIN_PRIORITY | USINT |
| HOST_OK | BOOL |
| BALANCE | BOOL |
| NO_EQ_TMO | TIME |
| ACK | BOOL |
Outputs
| Port | Type |
|---|---|
| NEXT_EQ | UINT |
| NEXT_TASK | UINT |
| DISPATCHED | BOOL |
| DISPATCH_VALID | BOOL |
| DISPATCH_COUNT | UDINT |
| AVAIL_COUNT | USINT |
| ASSIGN_PENDING | BOOL |
| HOLDING | BOOL |
| ALM_NO_EQ | BOOL |
| ALM_NO_TASK | BOOL |
| ALM_HOST_DOWN | BOOL |
| ALM_CFG_ERR | BOOL |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Validation evidence
- Tests
- 10
- Simulated scans
- 93
- 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 WCS_DISPATCHER — 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.