UniCloud: the end-to-end IIoT Platform for Unitronics Controllers

I know the feeling.

Duh!  I must have been too pre-occupied yesterday.  I work with them often, but I actually didn't see the relationship, and the really strange thing is that I don't actually recall being taught that symbol at all.  But I know the concept well.  So either the 10 gazillion other things going on in the brain shifted it out of BEPROM, or I didn't know it at all to begin with.   Odd.  cheers,  Aus

as said I have a v700 with module v200_18_e4xb I changed the status of the ports from I9 to I17 passing them to NPN, their common as per the manual I connected the positive 24vdc then I connected the cable in I9 I created a numeric variable window where I connected MI 9 after sending everything to the plc, when I turn it on, I don't see numbers that vary. according to you, a logic program must be made, where am I wrong T.C. I9 is not automatically mapped to MI 9 as a counter.  You need to create a counter in the ladder code for this to work.   Upload your program (.vlp file) so we can see what you've done so far. Joe T.

By definition, Deadband Control is fully on or fully off.  There's no in-between, and you said in your initial post that you wanted to prevent hardware chattering. That small of a fluctuation is really quite good for deadband control.  The range from deadband control can vary from +/- 1 degree to +/- 50 degrees depending on the thermal characteristics of the system. You can't have it both ways.  If you want more accurate control  you'll need something that can utilize a PID loop properly and apply energy to the system in an analog fashion - somewhere between 0% and 100% with a one second or faster loop update.  This is what we use solid state relays for in a heating application. Joe T.  

3+3=6 3! (factorial)=1x2x3=6 https://en.wikipedia.org/wiki/Factorial