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Write a log to PLC Next log file #21
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I think the Log class might help in this case:
This should log a message to the file /opt/plcnext/logs/Output.log.
Note that, by default, DEBUG and TRACE messages are not recorded in that log file. More information here:
Reacted by Ivan MaltarThank you for the answer. Is there maybe an example of using the methods in Log class? Specifically I am interested in how to define the format string and 'args' arguments.
It just uses standard C# formatting.
This example is based on the C# function template, and writes the value of the two input parameters to the log file:
[Function] public static class Function1 { [Execution] public static bool __Process( [Input] short IN1, [Input, DataType("WORD")] ushort IN2) { bool Function1 = false; if (IN1 + IN2 == 2) Function1 = true; Log.Info("Hello. IN1 = {0} and IN2 = {1}", IN1, IN2); return Function1; } }
There's resources online that explain C# output formatting, e.g.:
https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-stringsOk, I understand now. Thanks for the help!
Reacted by Martin Boers
One example of the feature that I find useful is writing a log to a PLC Next log file.
For example: if you catch an exception in your C# code, you could write the exception message to log file for diagnostic purposes.
Is there such possibility in PLC Next development tools?