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How can Unity Pro build error "Internal PLC memory full" error be corrected?

Issue:
  The PLC does not have enough memory to accommodate the project.

Resolution:
   If the PLC does not have enough space for the executable code, the PCMCIA card may be the answer.  
If the project is using more than 1 meg of declared/user data, the PCMCIA card will not correct the error. 

   The user can delete unused variables, purge unused FB instances and turn off 'Upload' information but it may be necessary to choose a PLC with more memory.
 
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