What causes fault code ASRS-SEQ1 (AS/RS Sequence Error — Incomplete Command)?

Previous command did not complete — crane still has a load from a failed prior cycle. Destination location is occupied — WMS shows empty but sensor shows full. Source location is empty — WMS shows occupied but crane found no load. Fork cycle timeout — fork extension or retraction took longer than allowed. Communication lost between WCS and crane controller mid-sequence

How do I fix fault code ASRS-SEQ1?

Check crane current status — determine which step in the sequence failed. If crane has an unexpected load, identify the load and determine correct destination. Verify source and destination locations physically — match to WMS data. If fork timeout, check fork mechanism for mechanical issues. Cancel the incomplete command in WCS and re-issue after resolving the root cause. Resynchronize WMS inventory data with physical reality using a spot-check cycle count

AS/RS Sequence Error — Incomplete Command

ASRS-SEQ1

Crane received a storage or retrieval command but cannot complete the sequence. One or more steps in the command sequence failed or timed out.

medium asrs

asrs sequence command wcs wms inventory cycle

Probable Causes (ranked)

Previous command did not complete — crane still has a load from a failed prior cycle
Destination location is occupied — WMS shows empty but sensor shows full
Source location is empty — WMS shows occupied but crane found no load
Fork cycle timeout — fork extension or retraction took longer than allowed
Communication lost between WCS and crane controller mid-sequence

Fix Steps

1 Check crane current status — determine which step in the sequence failed
2 If crane has an unexpected load, identify the load and determine correct destination
3 Verify source and destination locations physically — match to WMS data
4 If fork timeout, check fork mechanism for mechanical issues
5 Cancel the incomplete command in WCS and re-issue after resolving the root cause
6 Resynchronize WMS inventory data with physical reality using a spot-check cycle count

Field Trick

When sequence errors happen frequently, the root cause is almost always inventory accuracy. If your WMS says a location is empty and the crane arrives to find a load there, the previous putaway wasn't confirmed. Focus on closing the loop on every transaction — every put, every pick, confirmed with sensor feedback.

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