3/7/2016 4:24 PM | |
Posts: 6 Rating: (0) |
Hi, I'm trying to understand the structure of the following sample application: https://support.industry.siemens.com/cs/document/96784939/ The flowchart provided within the documentation tells you that the first step (STEP 0) of the program is to wait for a Read.PRESENCE signal, which tells us that there is a transponder in reach of the reader. Now, the third network within OB124 will call the Read block when this presence signal is TRUE. What I find confusing is that the Read.PRESENCE signal is being emitted/set within the read block. So, this looks like a deadlock to me. Deadlock? - Read block will be called on presence signal is true. - Presence signal will become true when read block is called (if transponder is in reach). How does this work? Best Regards. |
3/8/2016 8:48 AM | |
Posts: 6 Rating: (0) |
Hello, Thanks you so much for this explanation, I get it now! Best Regards. |
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