Siemens CPU 313C Hardware And Installation Manual page 147

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S7-300 is a maintenance-free automation system.
Thus, by maintenance we mean
• Back-up of operating system on a Micro Memory Card (MMC)
• Update of operating system by MMC
• Replacement of modules
• Replacement of the fuses in digital output modules
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we show you how to back up or update your operating system and to replace
modules, the back-up/rechargeable battery and the 120/230 VAC fuse of the digital
output module.
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In some cases, we recommend that you back up your CPU's operating system:
For example, you might want to replace the CPU in your plant with a CPU from
store. In this case, you should make sure that the CPU from store has the same
operating system that is used in the plant.
We also recommend that you create a back-up copy of the operating system for
emergency situations.
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03

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