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Temperature sensor (0-10V or 4-20mA) to Analog output of LOGO!12/24RCE without AM2 extension

Created by: kishore_wilson3 at: 4/3/2025 12:05 PM (12 Replies)

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4/15/2025 1:48 PM	Rate (0)
kishore_wilson3 Joined: 2/25/2025 Last visit: 7/1/2025 Posts: 7 Rating: (0)	Could you help me with the LOGO blocks to read the temperature from the sensor. Here is the method I tried but I didn't get any positive result. I have set the temperature sensor to 0-1000°C but initial raw value from the Analog input shows 200. With block diagram, I'm getting a temperature of -5°C. Any suggestions? Attachment Outside temp value.zip (221 Downloads)

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4/15/2025 2:01 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 9/2/2025 Posts: 35912 Rating: (4496)	If you convert through a 500 Ω resistor, the internal resistance of the LOGO! will still be in parallel with it. You'll have less than 500 Ω, probably around 497 Ω. Hence the display of -5 °C instead of 0 °C.

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4/16/2025 6:50 AM	Rate (0)
kishore_wilson3 Joined: 2/25/2025 Last visit: 7/1/2025 Posts: 7 Rating: (0)	Okay, but now I'm connecting the sensor directly to AM2 module with output of 4-20mA and it still shows the same. That means no current is flowing through the sensor, I guess!

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