My current arrangement with John is that I compensate him with Walmart gift cards.  A nice big image like that is going to cost me plenty  😃 The solder in a type T thermocouple may cause an issue if it's getting in between the two metals.  And it probably is. Stick the sensor in two known temperature sources - crushed ice in water (AKA a 32 deg F Ice Bath) and boiling water.  Water boiling point decreases 1 deg F per 500 feet of altitude, so in our region it should read 211 deg F. If the error is the same it's an offset.  If it changes then you have a mathematical correction factor, which may or may not be linear. Or you could weld the end using a 120V line cord jammed into a carbon block with a 100W light bulb as a current limiter like the do in the Emerson Motors lab.   It works great. https://electronics.stackexchange.com/questions/277335/thermocouple-welder-fixture If you shock yourself I will disavow any knowledge of your actions.     @Flex727 - for additional revenue, consider this experience I had with the Malwarebytes forum-   He was VERY helpful with my problem.  Yes, I did send him money. Hmmm.....   Joe T.

One of the simlpest hand made TC. http://www.cookingissues.com/index.html%3Fp=1099.html

I'm curious about the answer also, but I, too, suspect the solder joint. I'm also wondering what the going rate is for the J. Tauser & Assoc. ad placement - I'm always looking for additional sources of revenue. 

Hey All, I'm working a a little home workshop playtime project... I'm using a V570 with a V200-18-E3XB snap I/O module. I "hand-rolled" some type T thermocouples (wires at the business end tightly twisted and soldered to create my TC junction). Each T/C is about 30 ft long, and a direct connection with the E3XB module. I find that the readings I get at room temp are about 8 deg F higher than I get with "real" thermometers. I know I can build an offset into my readings, but curious where the discrepancy lies; Does the solder (60/40) that flows through the twisted Copper/Constantan junction create an offset? Does this fall within the expected accuracy of the E3XB module? Or is it something else? Anyone have any input on this matter? Regards, JohnR

This will be a quite a challenge for your first PLC project. Start by downloading UniLogic and the separate example programs collection.  Watch the UniLogic training videos at https://www.youtube.com/c/UnitronicsProgrammablecontrollers/videos Post a link to as much information as you can about the robot's communication protocol and interface type. Take the leap and start to build a UniLogic program based on what you understand.  When you run into a wall, post the program with your questions. Joe T.