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Ok. An update. I tried and tried and retried downloading the executable. Most of the time the process would get stuck before it had started. Some times it would start, transfe for about 3 seconds, then hang for 10 minutes. Eventually (since I thought I had nothing to lose), I started the pocess and watched the RX light. Every time the TX light flashed twice without a response from the RX, I pulsed the power signal on the Leo. As soon as power was restored, the communication would continue. I continued this process until the executable was completed downloaded and the system restarted. I then used the same technique to load the program. I've tested it and everything seems to work fine.
I don't have much understanding of why it works but I've gained a new practice for PLCs!!
I'm still not confident that my Leo is completely healthy but time will tell. Thanks for your help, Guy. You gave me the confidence to persist.
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