I am attempting to set up a block transaction group with six values. Five of them are reading directly from a PLC, but the sixth one is a calculation including two tags. When I set it up how I expect it to work, the calculated value always inserts NULL into the database, instead of the sum I am expecting. Are expressions not allowed inside a block item?
When I set it up like this, I get the result below. As you can see, meter 4 is inserting NULL.
I tried to set up a separate expression item, but it won’t let me insert the values into the same column. Is there a way to build a transaction group so that an expression like this can be inserted as part of the block?