Writing to a read-only tag exception about pylogix HOT 4 CLOSED

I didn't really want to go down the path of raising custom errors because there are quite a few. I made changes to raise ValueError more consistently. Your code will work fine with these changes since you were checking for ValueError.

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Thanks for the fix, will test sometime today. Looks good, CIP Status code, plus the string should be more than enough. By the way that tag giving me problems in the UDT was read/write, I will also try to test on my local setup. It's still strange to me why that tag is behaving that way.

<Member Name="ConHoldTime" DataType="REAL" Dimension="0" Radix="Float" Hidden="false" ExternalAccess="Read/Write"/>

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Even though ConHoldTime is set to Read/Write, the instance of UDT_TD_CfgData is set to ReadOnly. That is, Cfg the first member of UDT_TD_UNIT, which is of the type UDT_TD_CfgData and it is set to ReadOnly.

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Ah ok that makes sense nested structure, and the parent is read only. So confusing lol.

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