Hello all,
All my years I have worked with AB PLCs and now I am starting to do Siemens S71500/1200. Firstly, I am trying to understand the Data Blocks. In Rockwell, when you want to make a change in the tag, you just change and download. What is different in siemens is that it has start values actual values and snapshots. Can someone explain why do you need them?
When do I need to create a snapshot?- Is it when only when I make a change in the DB or whenever the plc will go from stop to run.
What if all the tags in the DB are retentive? What about the tags which are setpoint. ?
Sorry, I read a few answers but I am not sure about them.
All my years I have worked with AB PLCs and now I am starting to do Siemens S71500/1200. Firstly, I am trying to understand the Data Blocks. In Rockwell, when you want to make a change in the tag, you just change and download. What is different in siemens is that it has start values actual values and snapshots. Can someone explain why do you need them?
When do I need to create a snapshot?- Is it when only when I make a change in the DB or whenever the plc will go from stop to run.
What if all the tags in the DB are retentive? What about the tags which are setpoint. ?
Sorry, I read a few answers but I am not sure about them.