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S7 connection problem

Created by: jmonzon at: 11/24/2021 7:44 PM (12 Replies)

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11/24/2021 7:44 PM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	Hi everyone, I'm using a LOGO to get analog data from a sensor. I use an AI block which is connected to a NAQ. My objective is to read the data with Node-Red using the S7 protocol. The problem is that the value in the sensor doesn't match with the value in Node-Red. While the temperature sensor shows 46.6 the node in Node-Red shows 307. I tried to read with INT and WORD reading from VM and from the block (address: DB1,INT1406 ; DB1,WORD1406 ; DB1,INT0; DB1,WORD0) and always get the same result: 307. I've no idea how can I solve this... Does someone know what can be the problem?
	Last edited by: jmonzon at: 11/24/2021 19:44:52
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11/24/2021 7:48 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/18/2024 Posts: 34239 Rating: (4263)	Which data format has the value from the temperature sensor?

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11/24/2021 8:19 PM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	I don't know. It's a IFM TN2435. The datasheet (https://docs.rs-online.com/9fdb/0900766b815c8452.pdf) doesn't say anything about data format and I don't know how to check data type in LOGO!Soft. I only see the value 46.6
	Last edited by: jmonzon at: 11/24/2021 20:20:41
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11/24/2021 8:29 PM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/18/2024 Posts: 34239 Rating: (4263)	The data sheet of the sensor says: Temperatur range - 50,0 to 150,0 °C, You have to scale the AI value to the temperature range.

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This contribution was helpful to 1 thankful Users jmonzon

11/24/2021 8:33 PM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	I understand that I will get a 466 value from a 46'6 measurement, Is it rigth? [snip]
	Last edited by: jmonzon at: 11/24/2021 20:35:04 Last edited by: Jen_Moderator at: 11/25/2021 09:52:56 Division of questions into separate topics.
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11/24/2021 8:41 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/18/2024 Posts: 34239 Rating: (4263)	[snip] jmonzon I understand that I will get a 466 value from a 46'6 measurement, Is it rigth? Yes. LOGO! knows decimal points only in display.
	Last edited by: ixo65 at: 11/24/2021 20:42:58 Last edited by: Jen_Moderator at: 11/25/2021 09:53:13 Division of answers into separate topics.
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11/25/2021 8:53 AM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	Thank you! The communication os correcto, but the Logo! doesn't read the value properly. I've added the block with the same properties but the value in Logo is now 75 for a measurement of 19.7... What can be wrong?

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11/25/2021 9:00 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/18/2024 Posts: 34239 Rating: (4263)	Which version have you? 4-20 mA output? Or 0-10 V output? Which LOGO! AI use you? AI on a base modul or a AM2 module? How is the wiring?

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11/25/2021 9:51 AM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating: (172)	New question published by jmonzon is split to a separate thread with the subject How should I read data from Node-Red? Using DB1,WORD0? . Best regards Jen_Moderator

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11/25/2021 9:54 AM	Rate (0)
jmonzon Regular Member Joined: 6/15/2021 Last visit: 6/6/2023 Posts: 48 Rating: (0)	The output is 4-20mA. I'm using a AM2 module. The wiring is correct, I've just check it right now.
	Last edited by: jmonzon at: 11/25/2021 09:55:26
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