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Block number mystery

Created by: John822179 at: 3/7/2013 10:04 AM (2 Replies)

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3/7/2013 10:04 AM	Rate (0)
John822179 Posts: 2 Rating: (0)	Good morning everyone, I am building a Logo! Ladder application. When I tried to download my program to my Logo, I got the following error message: *** PC --> LOGO! Blocks without connection to an output: B048 Return T [Message texts] Download PC --> LOGO! failed I don't have a block called B048. By trial and error I managed to find the culprit, but is there a simple way of cross referencing BLOCK numbers with the reference numbers assigned to the program blocks? If this case, B048 refers to Block SF038. Not exactly an obvious connection! Many thanks John822179 Live long, prosper and be a little less confused!
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3/7/2013 11:18 AM	Rate (0)
Helmut_13 Posts: 2930 Rating: (432)	Hi, this "hidden" FB's accure if you do copy and past in LAD. The only simple way I know to find then is to change to FBD, then press F2, goto the FB number and fix it. A relation between FB and SF number is not possible because in LOGO! if you add a FB, then the number is generated automatically. SF are internal flags necessary in LAD. They start with number 1. So if you add a FB and it get FB100 and it requires a SF, then the SF get the next free number beginning at 1. You can not change this. My recommendation is to used FBD instead of LAD. Regards
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3/7/2013 1:28 PM	Rate (0)
John822179 Posts: 2 Rating: (0)	Hi, Many thanks for the explaination. I guess I am just going to have to suffer as I really don't want to get involved in using FBD! John 822179
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