Raghavay123

I want to what each letter in plc model denotes for eg: PLC 417-H

What 4 denotes: S7-400 family of PLCs

1 denotes a CPU module

7 denotes the relative power of the CPU (Cpus S7-417 are the most powerful, with the largest internal memory and fastest processor)

H denotes a High-availability CPU, meaning it is capable of redundant operation (2 CPUs share the process load and one will take over control if the other is defective).

Look at this document for much more details:

https://support.industry.siemens.com/cs/attachments/109767825/ST400_2017_en_Web.pdf

Hope this helps,

Daniel Chartier

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Split from Full meaning of the part number of siemens PLC modules.