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How to set a boolean input high (in FBD network)

Created by: make_it_move at: 6/7/2014 11:28 AM (4 Replies)

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6/7/2014 11:28 AM	Rate (0)
make_it_move Posts: 25 Rating: (1)	Hi, Im programming in FBD. I have an ADD function with (boolean) EN input. I want to set the input to true. Maybe a stupid question, but how do I do that? I tried to set it to true, 1, BOOL#1 etc. But none of them are accepted. I can offcourse connect it to an IO module input and set that one high. But that is not what I want. I searched the forum and did read manuals. But as far as I understand BOOL#1 should work.
make_it_move Posts: 25 Rating: (1)
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6/7/2014 12:48 PM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 12/12/2024 Posts: 508 Rating: (23)	make_it_move Hi, Im programming in FBD. I have an ADD function with (boolean) EN input. I want to set the input to true. Maybe a stupid question, but how do I do that? I tried to set it to true, 1, BOOL#1 etc. But none of them are accepted. I can offcourse connect it to an IO module input and set that one high. But that is not what I want. I searched the forum and did read manuals. But as far as I understand BOOL#1 should work. for example , AN #M0.0 S M0.1 A M0.1 R M0.0 M0.0 M0.1 ---\|/\|---------(S) M0.1 M0.0 ----\| \|----------(R)

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This contribution was helpful to 1 thankful Users Jaroslav Hofman

6/7/2014 2:30 PM	Rate (0)
make_it_move Posts: 25 Rating: (1)	And how would this be in FBD?
make_it_move Posts: 25 Rating: (1)
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6/7/2014 3:28 PM	Rate (1)
William_B Posts: 5225 Rating: (1199)	make_it_move And how would this be in FBD? Please see the attached JPG. I have not used FBD in TIA before, so I too had to do some digging. The enable for the instruction is not a must. The compiler handles it without issue. Alternatively you can create an always true bit. The coding for this is shown. (all above also tested for S7-300 PLC) Another method is using a global bit created by the PLC configuration.. if you are using an S7-1200 PLC. If you have doubts on how coding looks like, I suggest to make some code in LAD then ask TIA to change to FBD language. FBD and LAD can be freely converted from one to another. If I have not understood your question correcltly, please attached an image to show what your question is. Greetings. w Attachment Visual clue_enable for FBD instruction.jpg (808 Downloads)
William_B Posts: 5225 Rating: (1199)
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This contribution was helpful to 3 thankful Users H-H AutoGen_9398464 Eng.Yazan

6/7/2014 3:45 PM	Rate (0)
make_it_move Posts: 25 Rating: (1)	Thanks. That perfectly answers my question.
make_it_move Posts: 25 Rating: (1)
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This contribution was helpful to 1 thankful Users William_B

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