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Industry Automation and Control Forum
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Posted: 2025-07-04 06:15 AM
Hello team,
I want to use a M221 to permanently check some Modbus registers on few Panel Servers. In case of any change on a specific register, I want to trigger an output of the M221. Final goal is to use M221 as an alarm relay because HeatTag device doesn't have a dry contact to connect to a relay / PLC.
My architecture looks like below.
In this case:
I know I can use the Modbus TCP IO Scanner feature of the M221, but I do not know the limits...
How many Panel Server can the IO Scanner read permanently ? Any limitation regarding the total number of registers ?
Thanks for your help.
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Posted: 2025-07-04 11:51 PM . Last Modified: 2025-07-05 12:22 AM
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Posted: 2025-07-06 11:47 PM
Hi @Romain_Polette ,
You can have up to 16 devices configured on the IOScanner of the M221 when you use it over ModbusTcp.
Then per device (If I am not wrong) you can add up to 10 channels.
If you need more then I recommend you to go to another device like the M251 or M172.
Best regards,
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Posted: 2025-07-04 11:51 PM . Last Modified: 2025-07-05 12:22 AM
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Posted: 2025-07-06 11:47 PM
Hi @Romain_Polette ,
You can have up to 16 devices configured on the IOScanner of the M221 when you use it over ModbusTcp.
Then per device (If I am not wrong) you can add up to 10 channels.
If you need more then I recommend you to go to another device like the M251 or M172.
Best regards,
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Posted: 2025-07-06 11:58 PM
Thanks for your help @ismailozinan and @LeTomas .
Regards,
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