11/20/2013 7:18 PM | |
Joined: 9/27/2006 Last visit: 9/20/2024 Posts: 12282 Rating: (2684)
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Hello vipz; From http://en.wikipedia.org/wiki/RAM, a distinction between RAM and ROM: Both static and dynamic RAM are considered volatile, as their state is lost or reset when power is removed from the system. By contrast, read-only memory (ROM) stores data by permanently enabling or disabling selected transistors, such that the memory cannot be altered. Writeable variants of ROM (such as EEPROM and flash memory) share properties of both ROM and RAM, enabling data to persist without power and to be updated without requiring special equipment. And, from the manual Automation System S7-400 Hardware and Installation How to Carry Out a Memory Reset When you reset a CPU, you place the memories of the CPU in a defined initial state. The CPU also initializes its hardware parameters and some of the system program parameters. If you have inserted a Flash card with a user program in the CPU, the CPU transfers the user program and the system parameters stored on the Flash card into the main memory after the memory reset.
So you can assume that the RAM memory, without battery backup especially, will be reset when you proceed with aMReset operation on the CPU. |
11/29/2013 11:08 AM | |
Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30) |
Hai all, what kind of restart is MRESET ?? regards VIPZ
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