Some one tell me How I can select PLC

Hallo
I need a set of plc (power supply, CPU, inputs, outputs....etc)
My project Requires
* At least 20 analog Input pins it controlled variable resistance (5 kohm +20%)
Some one tell me How I can select PLC Variable%20restance

Some one tell me How I can select PLC Variable%20restance

* At least 30 digital output pins

* 10 digital input pins

Some can advice me How can buy a set of plc which can do, chip and reliable.

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