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6/15/2014 10:45 PM | |
Joined: 4/30/2011 Last visit: 1/9/2022 Posts: 223 Rating:
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How I caninvert bool tag ? (step7 Prof v13) |
6/16/2014 1:24 AM | |
Posts: 1064 Rating:
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in ladder use the following i0.0 i0.0 ----|/|----------( )-- this will invert the tag you can use any input .I just used i0.0 as an example |
6/16/2014 9:00 AM | |
Joined: 4/30/2011 Last visit: 1/9/2022 Posts: 223 Rating:
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NO, Its NOT work! because dont know status of Tag in any time
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6/16/2014 9:16 AM | |
Joined: 4/30/2011 Last visit: 1/9/2022 Posts: 223 Rating:
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Tks of course I tred it - its NOT work!
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6/16/2014 2:15 PM | |
Posts: 5225 Rating:
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"forbidden" is a strong word. It is legal what Steve suggested (for Siemens PLCs).. but it is not recommended. You will have trouble when using it on some other makes controllers, as the input buffer is written asynchronise with the program. Personally I would rather port through another variable. %I0.0 %M0.0 ----|/|----------( )-- As Steve said be careful (for this case) that the input buffer is not updated in some way. (ask confirmation) The command %I0.0:P might give a problem. ------ @Bill1777: You are having trouble with something deeper than what you asked for, if the solution is not working for you. Please be patient with me (us) and explain what the issue is. What is it you wish to change polarity. w |
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