Yaskawa VS-616G5 Modbus Plus Communication Card - Manual (Page 36)

7-4 Special MB+ Functions
Using the ‘ACCEPT’ and ‘ENTER’ Commands
The VS-616G5 has two types of memory: ‘Volatile’ and ‘Non-Volatile’. Data held in Volatile
memory will be lost when power is removed from the drive. Data held in Non-Volatile memory will
be retained when power is removed from the drive. The VS-616G5 also has ‘active’ and ‘inactive’
areas of memory. The different registers are saved and activated differently, as described below.
Command Registers:
The command registers (001h - 00Fh) are stored in Volatile Memory. When writing to a
command register the new data becomes active immediately. In the case of a power loss, all data
stored in these registers will not be retained.
Parameter Registers:
The parameter registers (100h-125h, 180h-1A5h, 200h-240h, 280h-296h, 300h-316h, 380h-39Ch,
400h-420h, 480h-4AAh, and 500-50Dh) are stored in Non-Volatile Memory. When writing new
data to parameter registers, the new data is not active.
Sending the ‘ACCEPT’ command will cause the new data to become active.
The ‘ACCEPT’ command is accomplished by writing a value of ‘0’ to data code FFDDh.
The ‘ACCEPT’ command allows the drive to run with these changed parameters. It also allows
parameters to again be changed from the drive keypad. The data is not saved to Non-Volatile
Memory.
Sending the ‘ENTER’ command will cause the new data to become active AND to be saved in
Non-Volatile memory.
The ‘ENTER’ command is accomplished by writing a value of ‘0’ to data code FFFDh.
If a power loss occurs after the new data has been saved (by using the ‘ENTER’ command) into
Non-Volatile Memory, the data will be retained .
Monitor Registers:
The monitor registers (020h - 097h, F000h - F00Fh, and F100h - F10Ah) are stored in Volatile
Memory. These registers can not be written to (read only registers). Any data read from the
monitor registers will not be retained during a power loss situation.
Special Registers:
The special registers (F200h, F201h, FFDDh, and FFFDh) are in Volatile Memory. These
registers will not be retained during a power loss situation. When writing to a special register, the
new data becomes active immediately.
Examples of writing the ‘ENTER’ and ‘ACCEPT’ command can be found in Chapter 9: Example
#5 (Write Acceleration and Deceleration), and Example #8 (Write Drive Parameter Registers).
CAUTION
USE THE ‘ENTER’ COMMAND ONLY WHEN NECESSARY!
The life of the Non-Volatile EEPROM on the VS-616G5 will support
a finite number of operations. This means that the ‘ENTER’ command can only
be used a maximum of 100,000 times to store data in the EEPROM. After the
specified number of operations, the EEPROM may fault (ERR), requiring the
VS-616G5 control board to be replaced.