Siemens Step 7 question
Siemens Step 7 question
(OP)
What is significant about FB80 and why is important to load this block even though nothing is in it??
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RE: Siemens Step 7 question
RE: Siemens Step 7 question
If your preset scan cycle time is exceeded and you don't have OB80 loaded, your CPU will STOP
RE: Siemens Step 7 question
Many of the OB’s are for error handling, when an error occurs like excessive scan time these OB are called. They allow the user to set up error handling, even though there may not be any logic in them they are still call much like an FB would. If they don’t exist the PLC won't know how to handle the error and Fault. We have often set up attribute to send messages or even counters to log such events.