The string type has added a length attribute. When calling the "ReadTags" method, the values of the fields cannot be written.

[huohuaing]

As long as a default String is not used, if a specified length is set, it will not be possible to write.

[huohuaing]

The problem has been identified. The variable m_MaxLength is a constant with a value of 254. It was given a length that was too long when creating the ValueUSIntArray array. But how can we obtain the length of a String variable?

[thomas-v2]

The string length is in the POffsetInfoType information block. There are two fields: "UnspecifiedOffsetinfo1" is the max. length of the string as from the definition in the plc program, "UnspecifiedOffsetinfo2" is the max. length plus the 2 bytes stringheader