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Lreal OPC tag

Created by: AutoGen_1a7ca at: 2/9/2023 4:09 PM (4 Replies)

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2/9/2023 4:09 PM	Rate (0)
AutoGen_1a7ca Joined: 2/9/2023 Last visit: 1/2/2024 Posts: 2 Rating: (0)	Good evening , i have a function that reads 4 modbus registers and creates a Lreal . On the online Main I can see the value in HEX and DEC, if I send it via OPC UA I can't receive it. Has this ever happened to you? I use a PLC s7 1200
	Last edited by: Jen_Moderator at: 02/10/2023 09:02:17 Textformatting optimized.
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2/13/2023 8:22 AM	Rate (0)
AutoGen_1a7ca Joined: 2/9/2023 Last visit: 1/2/2024 Posts: 2 Rating: (0)	Can anyone help me?

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2/13/2023 9:19 AM	Rate (0)
qwazee Platinum Member Joined: 3/30/2020 Last visit: 12/11/2025 Posts: 5656 Rating: (1082)	U_f36aee04-5a56-4f9d-994d-dff8858c6513 Good evening , i have a function that reads 4 modbus registers and creates a Lreal . On the online Main I can see the value in HEX and DEC, if I send it via OPC UA I can't receive it. Has this ever happened to you? I use a PLC s7 1200 It is not clear to me: From where is the LREAL value coming from? Does the value originate from the S7-1200 or the partner device? Why are you mentioning Modbus registers and then OPC UA? Consider making a picture to explain what is connected where and how data is flowing. Evaluate the order of the Modbus registers. This may need to be swapped.
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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2/23/2023 12:08 PM	Rate (0)
Murof Platinum Member Joined: 8/3/2009 Last visit: 12/19/2025 Posts: 16612 Rating: (1944)	Hello U_f36aee04-5a56-4... Do I understand correctly, you use the S71200 integrated OPC UA Server and you want to access a LReal over OPC UA? In the TIA manual a LREAL on SIMATIC side is a Double on OPC UA Data side. do you r OPC UA Client should use a double datatype. (But is released and should work) Bye Murof
	Last edited by: Murof at: 03/02/2023 12:05:19 If this Information really helps, you could use the Rate function
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2/24/2023 5:59 AM	Rate (0)
sancruz Gold Expert Joined: 3/11/2019 Last visit: 12/9/2025 Posts: 1653 Rating: (322)	Hi, please be more specific. What is done via Modbus and what via OPC UA? Does OPC UA already work with other tags? Just a general guess. As it is an S7-1200, the OPC UA server interface must be configured manually, maybe this tag is missing in interface configuration of OPC UA server. Modeling the S7-1200 OPC UA Server interface in TIA Portal regards sancruz
	Feedback appreciated, please rate
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