jeffaward Posted April 8, 2013 Report Share Posted April 8, 2013 I am brand new to PLCs and Visilogic. I am looking to upgrade a punch press system to use a PLC and eventually add other aspects into the PLC control like low lube and part detection. This is my first attempt at using/programming a PLC so I want to start with the basics. I wanted to share my thought process and see if perhaps anyone might be able to give me encouragement or see an error in my thinking I attended 2 days of a Unitronic seminar so I have a general understanding from the exercises but no real world experience with programming. So here is my situation.... I have a Vision 350. Once my system is started, the V350 is to signal my servo feed. The feed will take this signal, close a switch and it will cycle. It will send a 24 vdc signal as it is in motion which I want to send to the V350. Once the feed has stopped, the signal will drop to 0 and the V350 will then move to the next rung and signal the press. I do not have the particulars on what the press will send but I am assuming it is similar to the feed for now. Once the press has cycled, the signal will drop to 0 and the controller will start the process again. Since each of my units have "brains" to determine their feed length and single stroke properties, I believe all I need is to set a direct contact on the ladder to send a momentary signal to start each unit. What I am unsure of is what element needs to be used when looking for the signal to drop to 0? Is this a negative transition or perhaps something that is directly related to the physical reading of the input...a comparison function? Any thoughts are greatly appreciated. Jeff Quote Link to comment Share on other sites More sharing options...
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