Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 170)

Chapter 7
Programming Parameters
7-4
1 Bit Field Select – A single bit used to enable/disable a specific drive
function. For 1 bit field select type data, the entire 16 bit word is stored
in the parameter entry, but only the first bit (bit 0) is used.
Parameter Table Storage Whenever power is applied to the drive control, the entire parameter
table is copied from EEPROM to RAM (Random Access Memory). All
information stored in RAM is lost when power is disconnected. All
Set-Up parameters in the drive required for the basic calibration and
scaling of the control functions must be retained even when power is
disconnected from the drive, so that the setup information does not need
to be re-entered into the drive every time power is re-applied. EEPROM
memory is used to store the values of the Setup Parameters when the
drive is not powered up.
Whenever a parameter value is changed, either from the Programming
Terminal, or through an external device connected to Port A or B, the
new information is stored in the RAM of the drive. If this data will be
stored in the EEPROM, the Drive must be commanded to copy the
parameter data from the RAM to the EEPROM. This is done using a
write to EEPROM command (available on the Programming Terminal
through the EEPROM mode).
In addition to the parameter values, the configuration information
(linking Source to Sink parameters) is also stored in the RAM of the
drive. Whenever a change to the configuration is to be backed up in
EEPROM, the EEPROM write command must be given.
For details on saving parameters refer to the Programming Terminal
Operation Manual.