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Old October 7th, 2013, 08:37 AM   #11
iant
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Australia

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Join Date: May 2002
Location: Melbourne
Posts: 3,687
about 30 years ago PLC's became cheaper when you had a count of 20 relay.
now it is about 5
consider a cheap PLC with free software and Interposing relays.
search the site there are plenty suggested.
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