How about: "Motion Detect" and "Deviation" UDFB.
Motion detect is very useful in digital scales, where you need to watch if a specific analog value isn't changing for more than X within a specified time.
Deviation is useful when you have to monitor an analog value overnight, to watch for drift, changes, etc.
What happened to filtering? VisiLogic had a very nice Filter FB, which had rolling and order-weighed average filter.
Also, we're still short of UniStream loadcell module.
(Hello everyone! It's been like, 6 years since I last posted here. After ten large and interesting projects and many Unitronic PLCs installed, I'm back^^)