Well, under normal circumstances you would plug in a cable between your PC and the PLC and program it locally. But with today's technology we can do almost everything remotely. Program PLC, control a machine, adjust temperature and so on.
If you use an industrial router with remote feautures you could easily program from within your desired location. For an example, let's say you have 3 customers. 1 in China, 1 in Ukraine and 1 in US.
What would you do if one of them needed help to program a machine? What if two of them needed help ASAP at the same time but physically were in China and US?
You would have to send someone out there with the knowledge for repair and with expensive plain flights. Instead, it is both cheaper and easier to open op your plc remote control software and remote that machine in China and the other one in US from your own desired location. And this is what remote programming a PLC can do. :-)
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