SteelBlue48310 Posted February 20, 2013 Report Share Posted February 20, 2013 OK, new problem to solve... I am really stumped trying to solve a logic issue with my M91 project. Here's the scenario: I have an analog transducer that is mechanically tied to a piece of machinery that moves in a linear motion. (Up and down) The M91 shows the relative distance from the floor, in inches... and I can set a 'new' height value which causes an output to energize that closes a motor contactor to run a motor to move the machine up or down. That part all works great. What I am struggling with is the logic to display a message in the event of a failure to actually move the machine, for a variety of reasons. The hard part is that the machine moves *very* slowly, and can take as much as 10 minutes to move from the lowest point to the highest point.... but, I want the 'failure' message (display) to occur if there is no actual movement within 5-10 seconds. With the 'math' and 'compare' functions that I have available to me in the M91 ladder, I can't seem to find the "right" methodolgy to make this work! Any ideas would be greatly appreciated! ~Mike Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.