Moran Posted July 25, 2013 Report Share Posted July 25, 2013 hello, i need to measure a sin signal 40MHz freq and 3V. i wand to show this signal on the PLC screen and i need the PLC to monitor this signal and in case of the signal disappear to print a FAIL massage. 1. can i measure this frequency? 2. should i use trends? i am using the V570 PLC. some help will be appreciated. thanks. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted July 26, 2013 MVP 2021 Report Share Posted July 26, 2013 No, the PLC can't see a 40 MHz 3V signal. The highest frequency we can see is 20 kHz and the amplitude needs to be at least 17 volts. You're going to need to roll your own circuit - I would start with something like this- http://www.linear.com/product/LT5538 Run the output level signal into an Unitronics analog input. Joe T. Quote Link to comment Share on other sites More sharing options...
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