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I want to read and write variables using m340 PLC of altivar 312 drive, I have read the variables by using ADDM block and READ_VAR block successfully, but i fail to write the registers.(unity pro 6.0)

for communicating to drives and you have configured 10 words for read and for write as well.

- In drives there are registers which are read only type and writes are not allowed.  So check that write is permitted for all the 10 registers. 
if any one in between is read only type, complete write request may fail.

- Remove any offset if its present.
- check with modscan. Are you able to write to all the 10 registers. If yes, then sure you can with M340 also.

So please recheck your registers types for read and write once again and for any offset if present. 
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