Hardware configuration

Hello everyone,

I have to build an hardware configuration for a client and I have problems choosing the type of DI/DO/AI cards. 

I have a S71500 (CPU 1513-1 PN) plc and I have around 250 DI, 250 DO, and 50 AI to connect to my plc. 

As there is a lot of output/input, I have to put decentralized IO module in the same cabinet. 

Also I was thinking about this configuration :

On the main rack (where my S71500 is) I put the general IO so I have 1 DI card and 1 DO card :

- 6ES7 521-BH00-0AB0 (DI)

- 6ES7 522-1BF00-0AB0 (DO)

Then I was thinking about adding and IM 155-6 DP HF for decentralized profibus IO. I want to put 3 of them with, 3 DI cards of 16 inputs, 3 DO cards of 16 outputs and 2 AI cards with 8 inputs.

For DI I am thinking about choosing 6ES7 131-6BH00-0BA0

For DO : 6ES7 132-6BH00-0BA0

For AI, I have sensors that have external power supply. Also I will need sink type cards and I don't see which one is a sink type and wich one is a source type card in the catalog. May be it is set by how the sensor is connected to the card? (4 wire or 2 wire)?

If you have advise on a better configuration or if you see problems into the configuration that I planned to put please tell me. Because right now I so much confused .

Do you use TiA selection tool? Maybe it can help you out

https://new.siemens.com/global/en/products/automation/topic-areas/tia/tia-selection-tool.html