I've designed complex control systems but PLCs weren't part of the situation. So, I've not used PLCs hands-on but the concepts of how they work, etc. seems easy enough. I'm trying to learn more about PLCs so I might be able to help improve an existing system. I've not seen any documentation for the system and have doubts regarding the quality and completeness of what I'll find.
One question that comes to mind that seems typical of processors in general is "how do you program these things?" I *don't* mean what does a ladder diagram look like or how it's interpreted. I mean:
What interfaces and tools are used?
It appears that RS232 might be a typical physical interface and ethernet another. So, if that's the case then some command line interface must exist and even a GUI interface for programming.
OK .... with that:
I have an existing system that has a couple of PCs set up for monitoring and some simple controls. Would I expect to find PLC programming tools on one of the PCs? What might I be looking for?
No, I'm not going to muck about in something I don't understand... I *am* going to learn something though.
A couple of good references would be appreciated.
Thanks,
Fred