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Themocouple Problem in PCS7 System

5/14/2012 9:11 PM	Rate (0)
Nicky123 Posts: 59 Rating: (2)	Dear All, In my pcs7 project, I am having a analog input module with MLFB no 6ES7 331-7PF11 -0AB0.Now I have to connect the thermo couple(Type B) sensor to this module.So far, I have connected the sensor to the module and also I am getting the actual temp. in real format. But my problem is that the real value has just one decimal point value.(i.e. 36.3 0C) I need to have at least 3 decimal point value(i.e. 36.378 0C) to get accurate temp. Value in order to control my process. Please reply me how can I resolve this problem . Thanks in Advance.
Nicky123 Posts: 59 Rating: (2)
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5/14/2012 9:13 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	You know that accuracy is less than 1°C?
IBN-Service Posts: 8946 Rating: (1000)
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5/14/2012 10:03 PM	Rate (0)
RugbyGuy Silver Expert Joined: 1/15/2009 Last visit: 10/30/2025 Posts: 316 Rating: (40)	Hi Nicky123, The module's documentation can be downloaded here, http://support.automation.siemens.com/US/view/en/8859629 But in from the documentation we find, ________________________________________________ The basic error limit (operational limit at 25 °C, relative to the measurement range end value in the selected input range) Type B ** +800 °C to +1820 °C ± 1.0 °C +200 °C to +800 °C ± 2.0 °C and for Operational limit (across temperature range, relative to the measurement range end value of the input range) (0 to 60 °C)Note: This limit does not cover the temperature-error comparison points. Type B +800 °C to +1820 °C ± 2.3 °C +200 °C +800 °C ± 2.5 °C where, ** Because of the slight rise within the range of ca. 0 °C to 85 °C, the lack of compensation for the reference junctiontemperature only has a negligible effect on a type B thermocouple. If there is no compensation, and the measurement type"Compensation to 0 °C" is set, the deviation at the type B thermocouple during temperature measurement is: 200 °C to 1802 °C < 0.5 °C
	The best location for all PCS 7 content (manuals, guides, application notes, FAQs, and videos). https://support.industry.siemens.com/cs/ww/en/view/63481413
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5/15/2012 9:20 PM	Rate (0)
SolutionFinder Posts: 559 Rating: (87)	Dear Nicky123, It is based on the Representation of the analog values of thermocouples type B. You will find the information in this manual under page 234: of the manual of above post: The CFC is displaying the information based on the information(representation) of the thermocouple element.
SolutionFinder Posts: 559 Rating: (87)	Last edited by: SolutionFinder at: 5/15/2012 9:21 PM
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