OK, the 2TL1-1 is a standard DPDT ON-OFF-ON switch.
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You're not kidding about the wiring harness documents being cryptic! They'll take
some effort to figure out.
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It looks like the E10+ PLC is still sold by Triangle Research:
https://triplc.com/e10npn.htm
Also available from Latin-Tech:
https://tinyurl.com/22hhj7zu+
There are links near the bottom of the page to download free programming software,
a help document and a command reference manual.
That said, learning ladder logic programming just for this project is probably
a steep hill to climb, so even with the PLC available it might not be the best
solution. Let's think on this a bit more...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=516874#516874
