Q: I've read where it states that the battery is backup power for the CMOS. Is this where all the PCB configuration is stored or do the modules have ROM memory for the PCB configuration?
A: With all the MVI46, 56 and 71 modules, configuration is either stored in CF, or the configuration comes from ladder. On some of the 69 modules, the configuration is stored in Flash memory. None of the configuration of the module is backed up in using battery backup. The only settings stored in CMOS on MVI modules is the BIOS settings for the module.
The battery has been removed from MVI56E modules because it is not necessary.