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mathiask88 / node-snap7

node.js wrapper for snap7
MIT License
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PLC readDB <Pending> #48

Closed anthrogan closed 5 years ago

anthrogan commented 5 years ago

Any reason why a PLC wouldn't respond when its requested to readDB? In particular its the 315/7? I've checked connection resource etc and can't see anything obvious it just seems to never respond after a read attempt, The issue is obviously with the PLCs but I'm kinda lost in terms of where to look!

Johanneslueke commented 5 years ago

If the DB is compressed reading it is not possible. Did you checked that this option is disabled

Another reason might be you have to configure an tcp connection via the Tia Portal

anthrogan commented 5 years ago

After some investigation and a chat with a siemens integrator it's appears to be down to the 343 cards in the facilities regardless of it being a 343-1 or 343 Lean. I assumed maybe a firmware difference as both cards have the same order number but there's some suggestion to the cards being physically a little different too according to their hardware version which in my mind should really change the order number:

image

Oh well nevermind, I will collect data via OPC through connectivity pack instead. Hopefully this is helpful to someone!