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""E11.6" in LAD

Created by: nbk at: 12/2/2011 3:47 PM (5 Replies)

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12/2/2011 3:47 PM	Rate (0)
nbk Posts: 197 Rating: (3)	Dear All, Please see the attachment. Is it advisable to use same contacts of "E 11.6" one "NC" and one "NO" in parallel? That is a is real machine ladder logic. Regards Attachment LAD_1.JPG (167 Downloads)
nbk Posts: 197 Rating: (3)
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12/2/2011 4:12 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 6/17/2025 Posts: 231 Rating: (23)	No it is not. I supose the reason was to remove I11.6 from the logic, and sometimes this worksas aremark of the change made...

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This contribution was helpful to 1 thankful Users nbk

12/2/2011 4:13 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	nbk Dear All, Please see the attachment. Is it advisable to use same contacts of "E 11.6" one "NC" and one "NO" in parallel? That is a is real machine ladder logic. Regards Dear nbk, It is always true condition and has no effect on logic you uploaded.When you "OR" a bit with its "NOT" signal, you created always true which has no effect in "AND" logic.May be the programmer change his/her mind about "E 11.6" and by pass its effect without actually deleting the contact. Best regards, Hamid Hosseini
	Demo Channel on Youtube
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12/2/2011 5:44 PM	Rate (0)
nbk Posts: 197 Rating: (3)	Thanks Marciano / hdhosseini. I could recall "A + /A = 1" Boolean operation. But Just surprised to see that piece of "wiring" in the LAD. In this context, we'vea sensor signal (say "I5.6") which has to be monitored for 1 sec. as we expect the signal to keep changing (If it remains unchanged for 1 sec means there is a problem). Can we go with attachment 2? ....or any otherbetter way? Regards Attachment Attach_2.JPG (194 Downloads)
nbk Posts: 197 Rating: (3)
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This contribution was helpful to 1 thankful Users Marciano

12/2/2011 6:06 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	nbk Thanks Marciano / hdhosseini. I could recall "A + /A = 1" Boolean operation. But Just surprised to see that piece of "wiring" in the LAD. In this context, we'vea sensor signal (say "I5.6") which has to be monitored for 1 sec. as we expect the signal to keep changing (If it remains unchanged for 1 sec means there is a problem). Can we go with attachment 2? ....or any otherbetter way? Regards Dear nbk, I made same program in STL here: Connection Fault Between PLC and Wincc Check the result here: WINCC_PLC.zip Best regards, Hamid Hosseini
	Demo Channel on Youtube
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12/2/2011 7:27 PM	Rate (0)
nbk Posts: 197 Rating: (3)	Thank youhdhosseini.
nbk Posts: 197 Rating: (3)
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This contribution was helpful to 1 thankful Users hdhosseini

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