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Connect pt100 to onboard analog inputs on 0BA8 ?

Created by: serhat_ates at: 1/19/2016 8:07 AM (12 Replies)

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1/19/2016 8:07 AM	Rate (0)
serhat_ates Experienced Member Joined: 10/2/2015 Last visit: 6/19/2022 Posts: 49 Rating: (15)	Is it possible to able to that ? Second problem is, it gives me 2-10v instead of 0-10v. I use it with resistor.

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1/19/2016 8:17 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/20/2025 Posts: 36022 Rating: (4504)	While it is possible to connect the PC via a voltage divider directly to the 0-10V inputs. But it's a very imprecise measurement with a poor resolution. It is better to use a transmitter with a 0-10V output. As an example, a ebay link: http://www.ebay.co.uk/itm/Plastic-PT100-Temperature-Sensor-Transmitter-0-100C-Output-0-10V-DC-/361139776796

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This contribution was helpful to 1 thankful Users serhat_ates

1/19/2016 8:30 AM	Rate (0)
serhat_ates Experienced Member Joined: 10/2/2015 Last visit: 6/19/2022 Posts: 49 Rating: (15)	What do you think about this post ? https://support.industry.siemens.com/tf/ww/en/posts/is-it-possible-to-connect-pt100-to-logo-basic-module-24v/54507/?page=0&pageSize=10 Is it a good solution or not ?
	Last edited by: serhat_ates at: 1/19/2016 8:31:10 AM
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1/19/2016 8:56 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/20/2025 Posts: 36022 Rating: (4504)	I personally would not use this solution.

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1/19/2016 9:44 AM	Rate (0)
serhat_ates Experienced Member Joined: 10/2/2015 Last visit: 6/19/2022 Posts: 49 Rating: (15)	Thank you for response. Do you have different solution or thats all we can do for pt100 onboard?

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1/19/2016 9:51 AM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/20/2025 Posts: 36022 Rating: (4504)	Here's an example: A 1.5 kOhm resistor in series with a PT100 to 10V input, powered by 24V. PT100 resistance value at 0 °C = 100 Ω PT100 resistance value at 100 °C ≈ 138 Ω 1500 Ω: 100 Ω = 22.50 V: 1.50 V (by 0 °C) 1500 Ω: 138 Ω = 22.08 V: 1.92 V (by 100 °C) ΔU = 0.42 V Δϑ = 100 ° C Resolution: 0.01V = 2.38 ° C ≈ 2.5 °C That's a very poor resolution. Added to this is that the margin of error in the range of the analog input is very large.

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1/19/2016 10:06 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/20/2025 Posts: 36022 Rating: (4504)	serhat_ates Thank you for response. Do you have different solution or thats all we can do for pt100 onboard? My solution have I wrote: ixo65 ................................................ As an example, a ebay link: http://www.ebay.co.uk/itm/Plastic-PT100-Temperature-Sensor-Transmitter-0-100C-Output-0-10V-DC-/361139776796

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This contribution was helpful to 1 thankful Users serhat_ates

1/19/2016 10:30 AM	Rate (0)
serhat_ates Experienced Member Joined: 10/2/2015 Last visit: 6/19/2022 Posts: 49 Rating: (15)	Then, if i use 4-20mA converter with pt100 and 500ohm resistor. it gives me 2-10V Can i use that range instead of 0-10VDc ? Can i scale it what do you think?

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1/19/2016 10:36 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/20/2025 Posts: 36022 Rating: (4504)	Which temperature range?

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1/19/2016 12:24 PM	Rate (0)
serhat_ates Experienced Member Joined: 10/2/2015 Last visit: 6/19/2022 Posts: 49 Rating: (15)	Let s say 0 - 80 C . i give 2v input and get 202 decimal if i susbtract 202 from analog input i can set to zero . Can we do that math operation to analog input?
	Last edited by: serhat_ates at: 1/19/2016 12:24:52 PM Last edited by: serhat_ates at: 1/19/2016 12:28:28 PM Last edited by: serhat_ates at: 1/19/2016 12:28:37 PM
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