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using microcontroller signal to s7-300

Created by: Swagato at: 6/28/2012 5:24 PM (4 Replies)

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6/28/2012 5:24 PM	Rate (0)
Swagato Posts: 29 Rating: (0)	dear experts, i made a device with a microcontroller(AVR AT Mega 32) which continuously monitors room temperature(i used LM35 as temperature sensor) and operates a relay. Now i want to use the signal of this device to s7-300 plc so that the room temperature can be shown to the HMI. But I don't know how to do it. Please help me. Regards Swagata Bhattacharjee
Swagato Posts: 29 Rating: (0)
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6/28/2012 5:30 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/11/2024 Posts: 6852 Rating: (1365)	Swagato dear experts, i made a device with a microcontroller(AVR AT Mega 32) which continuously monitors room temperature(i used LM35 as temperature sensor) and operates a relay. Now i want to use the signal of this device to s7-300 plc so that the room temperature can be shown to the HMI. But I don't know how to do it. Please help me. Regards Swagata Bhattacharjee Hello , One of the possible ways ,one of my friends implemented, is using ATMEG32 as a MODBUS slave.There are useful libraries(MODBUS) in new version of programming softwares . Also check following link as a sample for chip interfaces to industrial networks. http://www.hms.se/products/abic.shtml Hope this helps Best regards Hamid Hosseini
	Last edited by: hdhosseini at: 6/28/2012 9:51 PM Demo Channel on Youtube
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6/29/2012 9:08 PM	Rate (0)
M.Fernandes Posts: 6 Rating: (0)	Hello, I don't know if is possible for your application, but some times I did a circuit (Attachment) to convert LM35 signal to 4-20 mA. You can find this circuit at LM35 Datasheet, for me it was a good solution. Best regards! Attachment 4-To-20 mA Current Source (0°C to + 100°C).JPG (163 Downloads)
M.Fernandes Posts: 6 Rating: (0)
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6/29/2012 11:26 PM	Rate (0)
Andrey_Afonin Experienced Member Joined: 8/30/2009 Last visit: 1/20/2021 Posts: 41 Rating: (0)	Fernandes, may I ask you about the source of circuit diagram you attached in post - what is this book/tutorial?

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6/30/2012 3:16 AM	Rate (0)
M.Fernandes Posts: 6 Rating: (0)	Andrey_Afonin, I found this circuit at LM35 Datasheet. I used a PIC microcontroller to display the temperature value in a LCD. You should send the 4-20 mA (0°C +100°C) toany analog card that woks with. LM35 Datasheet: https://www.national.com/ds/LM/LM35.pdf I hope this helps. Best regards. Marciel Fernandes
M.Fernandes Posts: 6 Rating: (0)
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