11/5/2009 9:34 AM | |
Posts: 661 Rating: (123) |
You can evaluate the wire break. That´s why LOGO! offers this option. Here is an example called "Correct scaling of a 4-20mA sensor": http://www.automation.siemens.com/logo/html_76/products/02Applications/index.html Block B003 is responsible for signals lower 4mA and will activate it´s output then. So this you cannont simulate, but check with the real logo if you disconnect the wire. More than 20mA cannot be evaluated, because LOGO!´s internal max value is 1000 (means 20mA). But perhaps you can go a little bit lower with this threshold (>19,5mA = overflow = Block B008). |
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