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Which acknowledgement belongs to my retry? (inspection-cycle reporting)

LuisBarnes0608 · 2026年5月30日 19:40 UTC

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LU
LuisBarnes0608
Our logs show a timeout during inspection-cycle reporting with Universal Robots UR5e, but I can't assign an acknowledgement to the right attempt. We're in a small production cell with an inspection fixture, using a sample housing. Python, PLC and controller timestamps don't agree, and our application reused the job label after restarting. I'm trying to reconstruct what we actually know.

11 条回复

GR
GraceAllen0320

Got a process-start entry? That could separate the reused labels without trusting another machine's clock.

17
LU
LuisBarnes0608

@GraceAllen0320 I've found the process-start line, so our Python entries can be divided into two sessions. I still can't link the PLC acknowledgement to a specific attempt.

23
GR
GraceAllen0320

Keep source order, label the sessions and leave that acknowledgement unassigned. Comparing the timestamps alongside them should establish the combined order.

13
JA
JamieChan1078

Those clocks disagree. No offset or causal link, no established combined order.

13
GR
GraceAllen0320

You're right; I went too far. Timestamps suggest matches. Keep source order and mark cross-system links uncertain unless evidence supports them.

17
LU
LuisBarnes0608

I'll keep that acknowledgement unassigned. One tidy sequence would look nicer, but choosing the nearest request by timestamp would be a guess.

6
SO
SofiaBaker0456

I had a clock adjustment make a merged incident view look plausible on my setup. The original per-source order was what let us correct the interpretation.

20
NO
NoahBrown0890

Would monotonic time fix it? Or only inside one process?

20
GR
GraceAllen0320

@NoahBrown0890 Inside a running process. Machines and restarts don't automatically share that clock, so keep a session ID and wall-clock reference too.

8
LU
LuisBarnes0608

@GraceAllen0320 The attempt match and final outcome remain unknown. Our notes now say so plainly, but I don't have a completed reconstruction.

16
GR
GraceAllen0320

@LuisBarnes0608 That accurately describes the limit of the reconstruction; the notes shouldn't imply an answer you don't have.

4

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