I have an issue with an Allen Bradley SLC 5/05 program acting “slow”. A few months ago, I noticed an issue with a part of my PLC program not executing when it was supposed to based on what screen was open on my Panelview. A piece in the machine should be inserted at a specific encoder position. When a certain screen was selected, the position would be late. When I did a trend, the part would try to insert when the encoder value was between 90 and 110, like it was programmed. When the screen was changed, the part would insert between 105 and 125. I noticed the refresh rate for this screen was set to .25 seconds. I changed all the refresh rates to 1 second, and seemed to help a lot. However, there is still the occasional time when the insertion position is late. Any thoughts? Could the Panelview still be causing the issue? Why would the refresh rate affect the program speed?
Thanks
Thanks