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| 6/7/2010 12:22 PM | |
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Posts: 173 Rating:
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Thermocouples only produce a very small voltage signal in the range of mV. Different types of TC's produce slightly more or less mV per deg Celcius. (most common or J or K type TC's in industry - do a google search or wikipedia to see how they actually work - quite fascinating!) The on-board LOGO! analog inputsfor voltage 0..10 V or the analog input module, are just not sensitive enough for these very small mV changes when a TC is submitted to different temperatures and temperature ranges. If you have to use a TC, then a small converter 'puck' can be used to generate either 0..10 V or 0/4..20 mA signals that can then be quite easily read in by the LOGO! on-board or expansion modules respectively! See http://www.globalspec.com/datasheets/329/areaspec/mount_thermohead Hope you can work further with the LOGO! with this! Cheers Aaaaarrrggghhh!!! ("Have a nice day!") |
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| 6/7/2010 1:18 PM | |
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Posts: 27 Rating:
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Thank you f or your help and one more question, if ı buy an ananog module still ı can not use thermocouples because you wrote support pt100. |
| 6/14/2010 3:57 PM | |
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Posts: 27 Rating:
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Thank you barbarian next time ı will try this. |
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