Posted 26 Apr 2016 Good day, I'm new to this forum and to mitsubishi PLC but was hoping for some assistance with a programming issue. I have been through the hardware and programming manuals without luck for this issue. Hardware: FX3G-60mt FX3G-2AD-BE Settings: Structured ladder/FBD Current input mode on: M8260 (first board, first input) What I need to do is to record the peak value over a cylinder stroke period. The hardware manual explains how to average the value using averaging time, however I basically need to peak hold and send that to a D register for go no-go compare. Process as follows: Contact closed, monitor D8260, contact open, move peak value from D8260 during monitor duration to D205. Thanks in advance for any assistance. -Swervomotor Share this post Link to post Share on other sites
Posted 27 Apr 2016 You could do it very simply with commands such as: IF D8620 > D205 THEN MOVE D8260 to D205 IF D8260 <= D205 THEN MOVE D205 to D205. You would just code this logic in ladder format and also determine when you wanted to reset D205 (MOVE 0 to D205) How successfull it would be would depened on the speed of the cylinder stroke compared to the scan time of the PLC. Say the piston took 1 second to cycle and the scan time was 5 ms, then the comparison would be done 200 times during the stroke of the piston, so the resolution of the maximum value attained would be quite good, but whether or not it's actually good enough depends on what you are trying to do with it. Share this post Link to post Share on other sites
Posted 5 May 2016 Colin, Just the answer I was looking for, thank you very much! Apologies for the late reply, work firewall blocks my access to sign in here. Share this post Link to post Share on other sites
