Host Engineering Forum

General Category => DirectSOFT => Topic started by: keycoldstorage on October 12, 2009, 02:00:38 PM

Title: Input logic true, output doesn't follow
Post by: keycoldstorage on October 12, 2009, 02:00:38 PM

I have a less than statement that evaluates as true and is not located within a stage, but the output side of the rung is only executed some of the time. Neither of the outputs pictured here, a timer and a coil, exist elsewhere on the output side of the program.

What am I missing?  ???

Title: Re: Input logic true, output doesn't follow
Post by: PLCGuy on October 12, 2009, 04:03:29 PM

The two numbers are really close together. I would say they are bouncing around. What I mean is the 43 could be 46 or higher. If they are the timer will never stay on to time out. It maybe happening so fast you can not see it due to the scan time between pc and plc. Just for a test, use a set bit on the compare rung then use that bit to turn on the timer and c bit.