If you run a large factory, you probably have a hugely expensive contract with a major programmable logic controller (PLC) manufacturer. One shudders to think of the cost of the service subscription to that manufacturer. However, if you are operating on a smaller scale, you might consider a DIY PLC like this one from (Mr Innovative).
PLCs are rarely state-of-the-art; they are more about reliability and compliance with common industry standards. To that end, this design features the ATmega328P. Few other microcontrollers are as well-known and trusted as this one. The device is compatible with RS232 and RS485 and runs on 24VDC, both of which are found in a typical industrial environment. It offers 24V digital inputs and outputs, and 0-10V analog inputs and outputs. (Mr Innovative) demonstrates this by connecting a DWIN human-machine interface (HMI) for, well… human interaction, and a frequency converter to run a motor.
If you want to run a simple industrial system but can’t afford the real industrial price tag, you might enjoy tinkering around at this level to begin with. This could be a great way to get a simple project up and running without breaking the bank. Video after the break.
