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6/28/2011 8:21 AM | |
Posts: 71 Rating: (0) |
Hi, I've two S7 CPU on the profibus and types are 318-2AJ00-0AB0. One of them has a RAM which is type is 6ES7 951 1AH00 0AA0. Both cpu have back up battery. The problem is when I switch off the line voltage, the program in the CPUs are deleted. I've checked the situation of batteries but there is no matter. Why programs are deleted? thnks |
6/28/2011 12:42 PM | |
Joined: 5/28/2008 Last visit: 1/21/2025 Posts: 4518 Rating: (841)
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Hello, Please tell us when you inseted the battery into your CPU? Is it more than one year? In this FAQ, it is stated that you have to change batteries once a year. What is the status of BATF led? Also may be the battery is new and give you battery fault error! (This FAQ is talking about S7-400 batteries) Now all relesed S7-300 have MMCs and there are no need for batteries for S7-300. For S7-400 it is pereferable to calculatebuffer times of theS7-400controller and then change the backup battery accordingly. |
Ayman Elotaify |
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