Adding previous totalizer value into current - Logix 5000 FBD

[TimD]

Hello All,

I can't seem to insert a flow totalizer value into my function block. I can only place values into the OldTotal Register.

I want my function block to output what my flow meter display says. Must I add these values and create a new totalized tag?

Thanks

 

[TConnolly]

Try writing directly to TotTag.Total with an Add instruction from either Ladder, FB, or ST.

TotTag.Total := TotTag.Total + SomeValue

If using FB then connect the ADD destination output to a reference to TotTag.Total instead of trying to wire it to the TotTag.Total output tab.

Make sure the ADD is controlled by a one shot or other logic necessary to keep undesired multiple adds from occurring.