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Learn how to develop an Arduino PLC Project
There are several examples using an Arduino industrial controller into this webpage and blog
Remember! you can use several libraries like: Controll.ino ethernet example. Using Arduino Mega and RS485, for example.
Arduino as a suitable solution for Industry. Thanks to the Industrial shield design, you can compare Arduino vs PLC because a PLC is an electronic device using a microcontroller as an Arduino board is. So Industrial Shields offer at the professional users, make plc projects with Arduino. It is also possible to program an Arduino plc ladder software.