Our sample-verification notes are pendant pictures without revisions. I can see the main routine, but not the called routines, fixture assumptions or ordinary PLC signals it expects. The original integrator is still available. What should I ask them to explain first?
Walk one normal job through with them and list every dependency encountered: program and called routines, fixture identity, expected ordinary signals, and where their definitions live. Then identify the installed revisions. Screenshots can illustrate that map, but they can't replace the missing relationships.
We have arranged that walkthrough. I also asked for a waiting case because another support exchange left us unsure what the fixture step expected to confirm. I mean the ordinary job behaviour, not the separately assessed safety functions.
Yes, and record who owns each explanation after the integrator leaves. A good description that nobody can update will get stale as soon as the fixture or routine changes. Have the maintainer follow the draft while the integrator can still answer questions.
Keep unresolved dependencies visible in the draft rather than filling them from guesswork; a box saying which answer is missing is more useful than a confident but invented signal meaning.