5/7/2014 10:35 PM | |
Posts: 146 Rating: (7) |
Anyone? |
5/8/2014 8:36 AM | |
Joined: 4/24/2006 Last visit: 9/24/2024 Posts: 8742 Rating: (1168) |
Hello, Go to the properties of the Data Blocks and check if the 'Retain' option is selected Best regards, Wizard |
5/8/2014 9:25 AM | |
Joined: 1/5/2011 Last visit: 6/15/2024 Posts: 815 Rating: (123) |
Hi Milos, First of all what Wizard said probably will solve your problem (thanks to him). But that the "problem" only happened once when you had several power losses might be explained by the behaviour of the CPU on power loss. I know for the S7-400 series when a power loss occurs, the CPU will execute a hot restart thismeansthe program will continue from the point were it was interrupted, all the values are retained (so the program continues where itgot interruptedwith the last values stored). But, a hot restart will only occur when the power resumes and the CPU has not been changed in STOP state. So if the CPU has gone into STOP state all values will be reset to their initial values (when DB's are not set to retain mode). I don't know if the ET200S series have the same behaviour, but if they do, this might explain your problem. If you want to be sure do a search on your CPU behaviour on power loss to clarify what really happened. EDIT: Milos I have did a search about the behaviour of a ET200S after a restart, here is the link: https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=6ES71517FA210AB0&caller=view You will find what you need in chapter 4: Memory concept. Hope this helps Kind regards, Jens |
Last edited by: Jens_app at: 5/8/2014 9:39 AMAdded link and additional information Keep it simple and on-topic. |
|
Follow us on