Rockwell Automation 1395 Digital Reference Adapter Board - Manual (Page 66)

Chapter 7
Troubleshooting
7-6
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.