gas said:
Hey!
Thanks. This IS a great site.
You may not want to hear this but I have to spoil it for you.
If you have an S7-200 sitting for a year without power apllied to it periodically, chances are by now you have lost the code and everything else in the PLC.
They utilize super capacitors as batteries and they are not good for long periods of inactivity.
A couple of weeks maybe ok but more than that and chances are you will need to reload your stuff.
I've had machines that came in form Germany and Austria, sat in a warehouse for a few months and when the customer turned the power on disocevered that they were faulted.
And since they are kind of cheap, they purchase used equipment "as is" which means, no code in any shape or form to re-load.
So I re-wrote it for them.
And they did go ahead and done it again as if the first time wasn't good enough!
Worked out well for me but you should be aware of what you are about to get into!