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M251 Modbus server fc4

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Jeneburg
Jeneburg
Cadet
‎2020-07-08 07:39 AM
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‎2020-07-08 07:39 AM

M251 Modbus server fc4

Hi, 

can be set, to make the modbus server respond to function 4 (read input register ) ?

 

Thanks.

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Rodrigo_Garcia
Administrator Rodrigo_Garcia Administrator
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‎2020-07-20 06:58 AM
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‎2020-07-20 06:58 AM

Re: M251 Modbus server fc4

@AmeliaFaraci : Could you help?

Rodrigo G. 


Industrial Automation Community manager

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LeTomas
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‎2020-07-21 12:11 AM
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‎2020-07-21 12:11 AM

Re: M251 Modbus server fc4

Hi @Jeneburg ,

 

If you take a look in the page 104 of the "Modicon M251 - Logic Controller - Programming Guide" :

https://download.schneider-electric.com/files?p_enDocType=User+guide&p_File_Name=EIO0000003089.02.pd...

 

If I am not wrong based on the document the FC4 is not supported for Modbus TCP Server but if the client uses FC3 you can move the %IW to %MW in the controller.

 

I hope this helps you.

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LeTomas
Ensign LeTomas Ensign
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‎2021-01-20 11:55 PM
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‎2021-01-20 11:55 PM

Re: M251 Modbus server fc4

Hi @louispijpers ,

 

A workaround could be the use of the ADDM and READ_VAR function blocks, please find below the link to download the example:

https://schneider-electric.box.com/s/bfg5ow6frqlr0lhkhweokic0j25qqg2t

 

If you do not know how to import it in your project you can take a look in the next video:

https://schneider-electric.box.com/s/4bvegb89udef194mavkubonmoc6pb2of

 

Best regards,

 

Letomas

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louispijpers
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‎2021-01-21 06:23 PM
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‎2021-01-21 06:23 PM

Re: M251 Modbus server fc4

Hi Le Thomas,

 

Thanks, I'll give it a go.

 

Regards,

 

Louis.

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