How to code a customized post-processing dll for PI OPC DA Interface

Discussion created by david@realiv on Nov 26, 2013
Latest reply on Nov 27, 2013 by Gopal

Hi all, 




Our customer wants all their tag values truncated by zero and span. For example, for a tag whose zero set to 50 and span set to 200, any value exceeds 250 should be truncated to 250 and passed to PI Server.




We understand this can be done using additional PE tags, but our customer do not want their tag counting doubled. It seems post-processing dll is the right approach. Since no out-of-box dll is available, we want to code a customized one. 




Where can we find the programming reference of this? Thanks in advance! 




Best regards,