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I have a tag on a Molding press for Cooling Time that counts up and then zeroes out. I am writing the data to a database using a trigger called New Data Flag. When the new data flag kicks from 0 to 1 I write the data to the database. Unfortunately the cooling time tag is at zero when the new data flag changes over.
So I think I can fix this by creating an advanced tag that will monitor the Cooling Time tag. I only want the advanced tag to update if the Cooling time tag is not zero. By doing this I will always end up with the last non zero value from the Cooling Time tag when the New Data Flag changes from 0 to 1.
My assumption is that a derived tag may work but I am not sure how to setup the expression. Any help would be appreciated.
Solved! Go to Solution.
You can create a derived tag using below expression and then use it for trigger. Refer Advanced Tags Help manual for more details (page=18)
https://www.ptc.com/store/-/media/kepware-store/en/manuals/advanced-tags-manual.pdf
Expression = TAG (Tag_Name)==1
You can create a derived tag using below expression and then use it for trigger. Refer Advanced Tags Help manual for more details (page=18)
https://www.ptc.com/store/-/media/kepware-store/en/manuals/advanced-tags-manual.pdf
Expression = TAG (Tag_Name)==1