User`s manual

CHAPTER 3: TROUBLESHOOTING
23
Error Code Description
12H, 15H, 16H General Message Structure Error
An expected message response from the PLC did not occur. For
example, an error would occur if the SOI expected but did not receive an
acknowledge from the PLC of data written to the PLC.
14H Illegal Data Block
The SOI requested a data block that is undefined within the PLC. The
operator should request data from a data block that has been defined by
the programming of the PLC.
18H Illegal Data Word
The SOI is trying to access a data word of a data block that is beyond
the PLC’s programmed range for the requested data block. The operator
should request a data word that is within the range that has been
defined by the programming of the PLC’s data block.