Joe & Ausman,
Thank you both for replying so promptly. We did replace battery(even though old one still read 3 volts.) We cannot reach our "original" programmer/controls guru-he is not responding to calls, bit of a mystery as he branched out on his own as an "independent" contractor I believe? So, have not been able to locate a "download and burn" backup?
Program to download was obtained via email with attached link. We physically connected from PC to PLC via USB to mini-USB cord.
How do I determine if "function block" for SD card was put into the program? It is included as an option in grahics. And, if so, could we "download" program from existing PLC unit with same setup and then "download" from SD card unto our failed PLC?
And Joe, we may very well need to PM you our program if our current AB rep isn't successful. We are located near Indianapolis, IN....and you? They are supposed to be assisting us with this situation today....we will see.
Thank you again for the input. This being a "new" approach to troubleshooting & sharing info for me! Have greatly appreciated the assistance.
In His Grace, rw