M221 IO Scanner for Multiple Modbus TCP Server

[Romain_Polette]

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:

• M221 will be the Client
• Each Panel Server will be a Server

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.

[ismailozinan · Accepted solution]

Hi,

This is example project  Sample Project .

Thanks.

Thanks,

[LeTomas · Accepted solution]

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,

[Romain_Polette]

Thanks for your help @ismailozinan and @LeTomas .

Regards,