MelsecQ - Hints and Tips

If the MELSECQ driver writes a string value to a PLC, it will use a null terminated ASCII value. If a third party driver or application does not correctly read the null character, buffered values may appear as additional junk characters. If this occurs, you may need to use Cicode to pad the values being written to a string tag.

For an example of how to do this, search the Knowledge Base page of the AVEVA™ Knowledge & Support Center (located at https://softwaresupport.aveva.com/) for article 000029195 MELSECQ driver writes 'junk' characters at the end of string tags.