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Step 7 Function Input Variable as Boolean w/o using a tag

Created by: Floyd at: 10/22/2009 10:55 PM (3 Replies)

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10/22/2009 10:55 PM	Rate (0)
Floyd Posts: 130 Rating: (1)	This should be simple, but i have been unable to figure out how or if i can do this. Can i assign a "FALSE" or "True" Boolean value to a boolean input to a function call? I know i can use a bit or variable to do this, but can't i use "false", "true", "0", or "1".It seems to work fine in STL, but not Ladder. See attached image Attachment FC105.jpg (494 Downloads)
Floyd Posts: 130 Rating: (1)
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10/22/2009 11:20 PM	Rate (0)
Martin L Posts: 25 Rating: (2)	Hi Floyd! The way I do it is that I perform a move of LB1 to MB1 in OB1. Then I have static true and false boolean. In OB1, L1.0 is always true, L1.1 is false during the first scan cycle after a restart, then true, L1.2 is always false. Hope this helps. Cheers, Martin L
Martin L Posts: 25 Rating: (2)
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10/22/2009 11:24 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/26/2023 Posts: 4477 Rating: (830)	Dear Floyd, For using Scale FC 105, and for Bipolar input, In LAD and FBD language, you have to assign a bit for this input. This bit may be a marker/ or bitin a datablock. (example: M 0.0 or DB1.DBX0.0) In STL, you can use True/ False without assigning an input. Regards,
	Ayman Elotaify
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10/22/2009 11:38 PM	Rate (0)
Floyd Posts: 130 Rating: (1)	Thanks guys. I have used a generated "Never_ON" and "Always_ON" Bits in the past, just looking to confirm i couldn't just type in "true".. You confirmed it for me... thanks
Floyd Posts: 130 Rating: (1)
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