Product - HMI Trending
In addition to the wet-end measurements it is essential that visibility be given to the machine operators so that they can see changing wet end conditions. This normally takes the form of trends against time either as an absolute measurement value or as a relative value (all trends equally scaled 0-100% of range). An absolute trend is normally a short-term trend typically over one to two hours so that process stability and immediate changes can be directly monitored. The use of relative trends provides information in the medium (eight to 24 hours) to long term (days to weeks to months). The same measurement data is also built into simple graphical reports (daily & grade) for wet end parameters.
Many mills have existing process control equipment in use (typically DCS) or extended QCS systems and connect all process measurements into a single system. Often this can be costly in terms of programming.
Existing process I/O connections or processor capacity may also be fully utilised. In these cases, or in mills with simple control schemes a PC based monitoring system based upon HMI software can be cost effectively used. Remote process I/O units can serially communicate data to a PC and display process information.
Wet end conditions can be quickly displayed to allow machine operators to gain the full advantage of this wet end visibility
