Emerson FM-3 - Manual (Page 78)

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FM-3 Programming Module Reference Manual
Setup NVM View
At power-down, parameters can be saved to Non-Volatile Memory (NVM). See the "How
Communications Work" section of the "Operational Overview" chapter for more details. In
PowerTools Pro, you can customize which parameters will be saved in non-volatile memory.
Figure 39: Setup NVM View
NVM Warning: Assigning parameters to NVM could shorten the life of your FM-3 or FM-4!
The Non-Volatile memory list displays the parameters that will be saved after power down.
A command to store these parameters into the NVM is given to the module whenever a
parameter on the list changes value (via a program or a communications network). Currently
the NVM in the FM-3 will accept at a minimum, 1 million writes before the FM-3 ceases
operation.
Therefore, do not add parameters to the NVM list if these parameters will be changing more
than an average of 1 time every 30 seconds.