1/10/2013 6:50 PM | |
Joined: 9/27/2006 Last visit: 10/9/2024 Posts: 12285 Rating: (2685) |
Hello Barry; The memory cards available for the S7-400 are described in the following FAQ, and the insertedquote is most important: How can I get an overview of the S7-400 memory concept? When using a RAM memory card, the system must be battery-operated so as to back up the RAM memory card data and the data in the internal RAM if there is a power failure. Hope this helps, |
This contribution was helpful to1 thankful Users |
1/10/2013 7:42 PM | |
Joined: 9/27/2006 Last visit: 10/9/2024 Posts: 12285 Rating: (2685) |
Hello Barry; It is possible also hat the client omitted to "depassivate" the batteries before replacement. The step is recommended in the battery documentation. Batteries that do not undergo depassivation will not operate properly. See the following link for a discussion on the subject. /tf/WW/en/Posts/72906 Hope this helps, Daniel Chartier Edit: Please reference pages 6.16 and 7.3 in the following manual for more information on depassivation of backup batteries: Automation System S7-400 Hardware and Installation D.C. |
Last edited by: dchartier at: 1/30/2013 9:42 PMAdded link to the S7-400 Hardware manual |
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