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Is there a way to find out where to program stops? Lets say an operator forgets to put a part in the machine and Step 7 is looking for that input. How would someone not familiar with the process troubleshoot the problem?

Can i access a Step 7 version 5.2 with my 5.1 version?

My company does not use our S7 300 series PLC for analog inputs. Instead we use these: http://bellsouthpwp.net/h/a/haygood33/karl.htm] http://www.dr-staiger-mohilo.de/e_kraft-weg_DMFPV3.html I ask the engineers why not let the PLC do the work?? They say too much programming.... What are the...

We have the S7-300 with a particular output module (6ES7322-1FH00-0AA0) that always has the SF light on. When I pull up thr hardware diagnostics...it shows nothing wrong. Any ideas??

What is significant about FB80 and why is important to load this block even though nothing is in it??