Will PLC replace relays?

I've been doing electromechanical repairs for a few years, and I'll give you my experience:

PLC will replace some of the functions of relays, but for now, it's not possible to replace them completely. Nowadays, PLC works with 12V voltage mostly, it is impossible to directly replace the relay to control 220V or even higher motors. Now more PLC as a logic control, and then control the relay, the relay to control the motor, such a situation, of course, the LED signal lamps do not need an intermediate relay.

Simple logic control in the case of a few relays to solve the problem, no one is stupid enough to have to buy a PLC to use, that requires money which!

Also, your concern is probably that learning about relays is useless. In fact, the basis of PLC is still relays, it can be said to be a group of relays imitated with a computer. I learned the relay knowledge before work, work at the beginning of the PLC, the guidance of the master after 2 hours, I can make a simple PLC program, advanced commands to read the manual, about 1 month, I thoroughly read the program in the OMRON C200H for our equipment.