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mycroes / Sally7

C# implementation of Siemens S7 connections with a focus on performance
MIT License
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ConcurrentRequest with too many large data items #15

Closed scamille closed 3 years ago

scamille commented 3 years ago

If I use the new concurrent request things with multiple large data items (1000 byte each), I get the following exception:

System.Exception: 'An error was returned during communication:

Message type: Ack / 0x02
Error class: ErrorOnSupplies / 0x85
Error code: 0x0
mycroes commented 3 years ago

That error class is funny. I never knew what it was for, but this seems to indicate something like 'Invalid request data'. Anyway, I'm assuming this error is no different than what you would get before? 1000 bytes is too large for 960 bytes PDU, which AFAIK is the largest that's supported by Siemens PLC's (and not even by all).

scamille commented 3 years ago

Not sure why yesterday I thought that 1000 bytes would fit, even with a S7 1500 ... Works just fine now with a limit of 500 bytes payload.

I am now using Sally7 0.9.0 and the performance with the ConcurrentRequestExecutor is fantastic :-)