Open EnricGarrigo opened 6 years ago
I can confirm, had to use If str(plc.get_cpu_state()) == "S7CpuStatusRun":
Works like charm but feels ghetto.
get_Connected() returns False when you run plc.disconnect()
but not when disconnected from the Network, still writes True.
Python 2.7, Debian, snap7-1.2.1 and the wrapper.
since python-snap7 is a thin wrapper around snap7, this is actually a bug in the snap7 lib. So the long-term solution is to report it upstream. The only problem is that last time I checked the project is not really maintained anymore, so that fix might never happen.
I could add @N3mesisXS's suggestion to python-snap7, but I'm not sure if that works correctly for all other users. So @EnricGarrigo, for now, I suggest adding this check to your code and see if that solves the problem.
davide is doing his best to maintain it right? I think he will fix it if you report it :)
On Thu, Aug 2, 2018 at 10:26 AM, Gijs Molenaar notifications@github.com wrote:
since python-snap7 is a thin wrapper around snap7, this is actually a bug in the snap7 lib. So the long-term solution is to report it upstream. The only problem is that last time I checked the project is not really maintained anymore, so that fix might never happen.
I could add @N3mesisXS https://github.com/N3mesisXS's suggestion to python-snap7, but I'm not sure if that works correctly for all other users. So @EnricGarrigo https://github.com/EnricGarrigo, for now, I suggest adding this check to your code and see if that solves the problem.
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there have been no commits to the repo for more than a year...
@EnricGarrigo if you could report the issue upstream and link back here that would be useful.
Luckily PLC's are made to run for 25 years or so. :). Interfaces do not change much. They have improved encryption on the newer models which are slowly very slowly being deployed..
On Thu, Aug 2, 2018, 12:11 Gijs Molenaar notifications@github.com wrote:
there have been no commits to the repo for more than a year...
@EnricGarrigo https://github.com/EnricGarrigo if you could report the issue upstream and link back here that would be useful.
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Hey everyone. Something new here? I need to check if the Logo reachable.
I wonder where to place @N3mesisXS workaround?
My workaround for this situation is to: 1) in the read loop I check the connection status before reading, if not connected I try to connect 2) catch the read/write exception and disconnect the client. At that point get_connected will return false, so when checking the connection in the read loop (1) i will know I have to reconnect This is also how Davide does in some examples (not in python).
I tested with Python 3.6 and Windows 7 64 bit. I have a 'While True' loop for test the connection continuously. If when the program starts the connection is OK, 'get_connected' returns 'true' and the loop runs. If the connection is broken during execution, 'get_connected' still returns 'true' and db_write crashes.
Does anyone know who avoid this behaviour?
Thanks.