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About nagaraj

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  1. I have used Citizen printers in the past with very good results. It is manufactured in Japan and there are several distributors in USA
  2. You are far better off using sensors with Analog Output. I just completed building a device using Temperature/RH transmitter using 4-20 mA analog output. Dwyer Instruments has a good catalog to choose from.
  3. I was going to suggest a high value for P too. I have never used PID server. How is it better than auto-tune or manual tune. I have never been a fan of auto-tune anyways.
  4. Are all the thermocouples showing an error or only the ones immersed in water? Are you connecting the thermocouples directly to the PLC? If you are using more wires as extensions, you will be creating more junctions and you will definitely see an error. Also, make sure only the tip of the thermocouple is immersed in water and not the insulation. We use thermocouples in our units all the time and I have found it to be better to linearize the output from the thermocouple using reference temperature at least 30 deg C apart rather than using the thermocouple output directly.
  5. That was a very good explanation for using UTC for elapsed time calculation. Thank you very much. I also did it using timers which put the calculations way off when done for long times.
  6. You are right. Thank you very much. Do you think the SB3 method will accumulate errors?
  7. Thank you very much Stembera. That makes perfect sense. I may not completely use your solution since I want to calculate elapsed time that may not have any relation to the real time clock. I would rather use SB13 or SB3 to increment MI0 and increment MI1 when MI0=360.
  8. I sent the program to support. Please let me know what you find out.
  9. I have the following timer logic to display elapsed time in Hours. Minute Timer to increment MI 0 If MI 0 = 6, Increment MI 1 and Store 0 in MI 0. Hence MI 1 should be equal to tenths of elapsed time in hours. Many of the units we shipped is off by almost an hour after about 1200 hours. Am I doing anything wrong?
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