Schmu (Customer) asked a question.
PX404 analog out: works for a while then stops
Using my 404 to output 4-20mA to a local tank level display. Works fine for 20 minutes or so then stops. Monitoring the MWX block from my Do-More software, it stops successfully communicating the write command to that module. The MRX in that Protoss station still functions. There are no overlapping addresses. A protoss reboot fixes it for a bit again. Any ideas? Thanks!!
Maybe you are writing too quickly and a buffer is filling up? A reboot would clear that buffer.
Try doubling the time between writes in your program and see if the issue goes away or it goes a longer period of time before it stops functioning.
As in the Yield time on the MWX? Sounds interesting. Will try.
I actually meant however you are activating the rung with the MWX on it, if you double the time between doing a write command then the buffer would either fill up more slowly or have enough time to completely be empty again before the next write command. If that works, then you know that the problem has to do with writing too much data too quickly. If the problem remains where communication is lost at 20 minutes even though time between writes is now doubled then it most likely isnt a data buffer issue with writing too often.
Adjusting the yield time in the PLC for how much time is dedicated to network comms would also be an interesting area to look at for the problem though.
Not getting anywhere. Rebooting doesn't work anymore either.
Im out of ideas then. Maybe @HOST_BobO (AutomationDirect) or @HOST_franji1 (HOST Engineering) can help with ideas on the BRX side to check.
Not sure which manufacturer makes Protos. I wonder if they are on these forums or not.