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

Give all the answers
- People seldom learn.

Guide People to the posibilities
- Their Answers will come easily.
- Their Knowledge will grow.

They will then teach others

Ian Trost
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