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Everything posted by Slwagner73

  1. SInk plc input module

    I cheat, I tell the people I hire the difference between sinking and sourcing is kind of simple. And if they look at the machine wiring prints, follow out which wire they are switching. PNP = It switches the positive circuit...PNP NPN = It switches the negative circuit....NPN I know this is simplistic, but for the non-engineers, it's easier to follow.
  2. Another Dumb newb question

    So, again, I find myself asking a dumb question.      I am trying to figure out how to write logic to use a 1734-IT2I, with a type J thermo-couple. I am not sure if I should try and figure out how to use a PID, or if there is some other function I should be using, something like scaling. In the past, with RSLogix 500, I would have tried using the scaling, but it is not available in ladder logic with Studio. I want to reference the first channel to monitor a temperature, and use it to control an output. And for the record, I am using Studio and a CompactLogix controller. The module is in slot 4 of a 1734-AENT, and the program sees it, and says it is viable. But for the life of me, I cannot figure out how to see it in the ladder logic. This may really sound dumb to you engineers, but I am trying to learn this on my own. I have attended a couple of Allen-Bradley classes, but they never touched on this. Any help really would be appreciated. Scott...
  3. Dumb SCP numbers

    Gentlemen: I am so confused. I have tried to figure this out, and I am still lost. Using a 1734-IT2C and Type K thermo., I can not get the numbers right. So, would someone please tell me where I am so screwed up on this?   I have been struggling with this for a month now! Thanks: Scott
  4. Taking Screen shots

    So, Green shot, and the snip-it tools both work! Thanks for replying! Scott
  5. So.... a lot of you on this forum seem to know how to do this, so I am going to ask here. How do you take a screen shot, and then post it so I can explain easier what I am struggling with? Thanks: Scott
  6. Another Dumb newb question

    Just so we all understand,  I put the thermocouple in a glass of ice water, and the thermometer reads 32, but trying to use those engineering numbers, my actual value was -480 degrees, so I played with the min and max inputs till it read 32 at those values. If I put in the 0-7000 values, I really have no idea what my scaled min and max should be set at. A type K thermo ranges from -270c to 1370c or -454 - 2300f. And that didn't work. The 1734-IT2I is configured just as pictured in Joe's screen shot. Again, thanks for reading and replying! Scott
  7. Another Dumb newb question

    J, nothing secret about it. I am monitoring thermo-couples, based on outside and inside heat, and turning a heater on in a shed, just to keep it from freezing everything up again. I am however, adding this to an existing program, and using RIO. Just being geeky! I am a maint. electrician at work, and have to troubleshoot all the PLC issues there, and so at home, I play/practice with the programs and hardware. (i know, get a real hobby) When I first got started with this stuff, I used RSLogix500, and it, to me, seemed pretty easy then. So, I just puttered and plinked around with it. Now, I have to be better at the troubleshooting, so I am trying to expand into the more difficult stuff, and boy, what an eye opener! But I sure do like the help I get from all of you here on this forum. Scott
  8. Another Dumb newb question

    So, Gentlemen. Can anyone tell me just what I have wrong here? Scott.
  9. Another Dumb newb question

    Andrew, I will, just as soon as I figure out a way to take a screen shot. I'm downloading Greenshot now. Wish me luck? Scott
  10. Taking Screen shots

    Thanks all, I will look for Greenshot. Scott
  11. Another Dumb newb question

    Well, I think I have come to the conclusion that a Thermo-couple is the wrong device for this process. Either I had some really stupid numbers in the SCP, or they are just not the way to go. I can't seem to get any kind of real response out of them. I wonder if an RTD and an AI wouldn't be a better option. Thanks for your help: Scott
  12. Another Dumb newb question

    So, gentlemen, as I once again admit, I don't have a clue what I'm doing. I have installed the Rockwell AOI, and yes, I can see it in the ladder, but all it gives me is a CPT instruction. And I have not a clue how to use it. If I use a LES, LEQ, GRT, or some such, I can input the Channel-Data, and by using a number for my Source B, I can control outputs, but this is just a number. Is there some magic instruction to convert this number to a more logical value. More like a true temperature? I am using the thermo-couple to control air louvers to open when a room gets to warm, and turn on a make up air fan. The actual ladder logic is very simplistic, but it would be easier to actually know what my number means, other than a number I play with till I have the right setting. As it is now, I have a thermostat that I am watching and when the room gets to the set-point, I adjust to match the number I am seeing. Very crude, and not very efficient. Also, it doesn't help anyone else down the road. Boy, this sure makes me feel DUMB having to ask, but I'm sure you guys know this inside out and upside down. And once again: Thanks for your help: Scott
  13. Another Dumb newb question

    You gentlemen, are a huge help. I have the AOI from Rockwell, and it actually works. If I knew more about PID programming, I would do more with it, but for now, I have something to work with. Again, THANK YOU. Scott.
  14. Another Dumb newb question

    Joe, thanks for that information, but I would also ask, in the ladder logic, what instruction would I use to actually utilize it? Like I stated before, with RSLogix 500, I would use scaling. But it’s not available in Studio for a CompactLogix in the ladder. Thanks, Scott.