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We have used "Word to Bit" and "Bit to Word" conversion for Digital Tags with local variables using cicode but some of the tags were not updating in SCADA . What could be reason for this problem.

As you were using local variables to extract the tags into bits , but there is limitation with these local variables that the local Variables are created in the memory at process startup, and they are available only to the process that created them. So in multi process this will not work as expected and creates some abnormal behaviour. 
We recommend to either run you VJC in single process mode or else change the local variables to any Disk IO Device variable .
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