Enter" Command - YASKAWA GPD 515/G5 Modbus RTU Technical Manual

ìENTERî Command
The GPD 515 has two types of memory: ëVolatileí and ëNon-Volatileí. Data held in the 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. Different types of registers are stored in
different areas of memory.
Command Data:
The command registers (000h to 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.
Monitor Data:
The monitor registers (010h to 01Fh) 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.
Parameter Data:
The parameter registers (100h to 50Dh) are stored in Non-Volatile memory. When writing new
data to parameter registers, an ëENTERí command must be given for the new data to become
active.
There are two different types of ëENTER' commands, 'ACCEPT' and 'ENTER'. For an 'ACCEPT',
write the value '0' to Modbus register FFDDh. This causes data to become "active". If a power
loss occurs, the data will not be retained. For an 'ENTER', write the value '0' to Modbus register
FFFDh. This causes data to become "active" and saves the date to Non-Volatile memory. If a
power loss occurs, the data will be retained.
Some Parameter Data registers may be written to while the drive is running. These parameters
are called run operative parameters. For a list of these paremeters, refer to Appendix A, Table
A1-11 of the GPD 515 technical manual (TM 4515).
All other Parameter Data registers may only be written to when the drive is stopped. These are
called non-run operative parameters.
If new data is written to any parameter serially, and is not followed by an 'ENTER' command, a
"Busy Write Protected" message will flash on the Digital Operator display if an attempt is then
made to change a parameter using the Digital Operator.
The same message will be displayed if an attempt is made to change a parameter via the Digital
Operator while the contents of the 'ENTER' command register is any value other than '0'.
Use the 'ENTER' (FFFDh) command only when necessary!
The life of the EEPROM (Non-Volatile memory) on the GPD 515 will support a finite number of
operations. This means that the 'ENTER' command, value '0' written to
register FFFDh, can only be used a maximum of a 100,000 times to store data in the EEPROM.
After the specified number of operations, the EEPROM may fault (ERR) requiring the GPD 515
NOTE
control board to be replaced.
Setting GPD 515 Parameters for Communication 5-5