Chart hand-off, com port closing


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thanks sensij. nice pickup and explanation. seems as though if there are no charts running then the FW thinks the strategy has stopped and closes the com handles. possible bug maybe?


Hi Guys,

I’m not sure I’d call this a “bug” although it is an interesting “use case,” not one we’d considered. I’d say that “normally” we’d expect the power up chart to start the other charts and then that other “looping” chart would make sure the comm handle was opened and STAYED open.

But who’s to say what’s “normal.” :slight_smile: Initializing other (non-comm handle) variables is pretty normal to do in the Powerup Chart. Also, is see we’re talking RS232 comm handle here (I’m hoping this is using a built-in port, vs. a remote 232 module). A local 232 port comm handle would be less important to monitor for open-ness than say, a comm handle talking to some remote tcp device–we’re your connection is likely to drop of any number of reasons.

I could also see how, if you were using this same comm handle in multiple charts, you might have just one of them (maybe even the Powerup chart) looping to check if that comm handle is still open, and log/email/turn on an alarm etc. if it’s not–so the other charts don’t have to all check.

In any case, thanks for generously sharing these good-to-know details!



Yes, the example case is referring to the port built in to an R1 controller. In my program, one looping chart may hand off to a different one for a variety of reasons. As the machine changes state, different logic may be required, and putting it all into a branching chart gets hard to follow. Most of the time, multiple charts are running anyway, but I’ve found during testing that sometimes it collapses down to just the main looping chart.

I wanted to throw this out there because I’m not sure if there is anything else that could be affected by the short “no chart running” condition that this use case creates. If not, then yeah, you’d never notice it if good com port management practices are implemented.


FYI, I asked the developer about any:

…other consequences…
…of being between-charts, beside the closing of the comm handles. My guess is this doesn’t happen often since most applications include at least one looping chart (like the one to re-enable your I/O Units, if you have any of those)?

Anyway, I asked about those “other consequences,” and learned that it’s: “Just the LED. Oh, and I think it puts the toilet seat down.” Sadly, the “seat down” part was just a joke, otherwise I’d be installing three in my house. :wink: