Questions about serial communication with PLCNext

PLCnext Technology & PLCnext Controls
1

Hey, guys, I need to ask you a question. A customer needs to read and write 40 Modbus RTU units with PLCNext. For this I think I must organize the equipments in two RS485 buses each one of 20 equipments obviously with two modules for serial communication. My consultations are the following ones:

> - Which CPU do you recommend to use AXC F 1152 or AXC F 2152?  
> - Which serial communication modules do you recommend to use the Daisy Chain communication bus?   
>  - AXL F RS UNI 1H  
>  - AXL SE RS485
I appreciate your help.
 
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2

Hi Luis,

Technically there is no difference in performance between the two Serial I/O module options. Both will work equally well.
Also, based on the information you have provided, the AXC F 1152 and AXC F 2152 will peform equally well in this case. There may be other factors in the project that may make a difference - e.g. the use of left-side modules or the number of tasks required, so please consider these differences when selecting the PLC.
Hope this helps.
~ Martin.