Our UR5e request disappears without an agreed clear rule

ElenaBennett0775 · 22 Jun 2026, 00:52 UTC

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EL
ElenaBennett0775
PLC request is brief. Our fixture-inspection app misses it sometimes. Nobody owns the clearing rules. Ordinary job interface only; safety is separate.

8 replies

JO
JonasBrooks0807
Replying to ElenaBennett0775

Does either side know whether acknowledgement means received or finished? I'd settle that before pulse length.

17 points
EL
ElenaBennett0775
Replying to JonasBrooks0807

The application calls it received. The PLC notes don't define it beyond acknowledgement.

20 points
KA
KaiBaker0454
Replying to ElenaBennett0775

Write the normal exchange in plain language with one writer per signal. Request held until an agreed response, acceptance separate from completion, and explicit clearing conditions. The notes should describe both sides of the same conversation.

18 points
RA
RaviBennett0737
Replying to ElenaBennett0775

I'd bring whoever supports each side into that discussion. We can make a tidy table in one room and still leave the relief technician with two incompatible drawings when the application changes.

6 points
JO
JonasBrooks0807
Replying to KaiBaker0454

Kai, include an interrupted exchange too. A clean first cycle doesn't explain a retained acknowledgement after restart.

14 points
KA
KaiBaker0454
Replying to JonasBrooks0807

Yes. I said normal exchange as a starting point, not the whole specification. Startup, timeout and retained states need their own decisions, including when work is uncertain and must not be automatically repeated.

17 points
EL
ElenaBennett0775
Replying to RaviBennett0737

Both maintainers will review it. We still haven't agreed acknowledgement meaning or restart behaviour.

14 points
RA
RaviBennett0737
Replying to ElenaBennett0775

Then those are the two questions for the meeting, not just approve the interface. A named review is useful, but your operators still need the agreed waiting and escalation states before this is handed over.

14 points

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