Hello, I'm pretty rusty on my STEP 7 software so looking for some help. We have FB's all written in STL. In the block interface/environment there are IN, OUT, IN-OUT, STAT & TEMP sections that have tags assigned. I have several boolean tags in the IN like I_Start, I_Stop and so forth that are only used in 2 or 3 areas of the STL but I cannot find what sets the I_Start tag. It isn't set in the body of the STL so must be from another FB or more likely a DB but can't figure where/how. I suspect these are buttons on an HMI but none of the HMI's appear to have buttons that set these bits (Operators pressed any start button they could find). This FB is called by other blocks but those blocks do not set these tags either. I looked in the DB that flashed under the DB1 & DB2 header and there are tags with the same name but not the same address that shows in the interface of the FB. Any help would be greatly appreciated.
