Our application sometimes misses the PLC's brief request for inspection-cycle coordination.
I'm reviewing that ordinary, non-safety handshake for Fairino FR10 in a workshop inspection station awaiting commissioning, with a fixture-mounted bracket in the setup.
Signal ownership and clearing conditions aren't clearly documented.
The safety functions are independently engineered and separate from this job interface.
A request pulse disappears between polls (Fairino FR10)
RebeccaBell0691 · 19 Jul 2026, 12:07 UTC
4 replies
Replying to RebeccaBell0691
Does your trace show when the PLC request is raised and cleared relative to application polls, including which side performs the clearing?
5pointsReplying to FionaBrooks0847
@FionaBrooks0847 I've compared the trace: the PLC raises and clears the request between consecutive application polls, with no observed acknowledgement before it clears.
9pointsReplying to RebeccaBell0691
Take an ownership table and a retained-request proposal to the interface owner. A request held until matching acknowledgement should settle the handshake in an offline review.
8pointsReplying to FionaBrooks0847
Settle it? Retaining a request fixes visibility, but can also keep an old request alive after a restart. Identity and reset rules matter.
-1pointsAdd to the discussion
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