E.10 Enter Command
When writing parameters to the drive from the PLC using MEMOBUS/Modbus communication, parameter H5-11 determines
whether an Enter command must be issued to enable these parameters. This section describes the types and functions of the
Enter commands.
u
Enter Command Types
The drive supports two types of Enter commands as shown in Table B.11. An Enter command is enabled by writing 0 to
register numbers 0900H or 0910H. It is only possible to write to these registers; attempting to read from these registers will
cause an error.
Table E.5 Enter Command Types
Register No. Description
0900H
Simultaneously writes data into the EEPROM (non-volatile memory) of the drive and enables the data in RAM. Parameter
changes remain after cycling power.
0910H Writes data in the RAM only. Parameter changes are lost when the drive is shut off.
Note: The EEPROM can only be written to 100,000 times, so it is recommended to limit the number of times writing to the EEPROM. The Enter
command registers are write-only and if these registers are read, the register address will be invalid (Error code: 02H). An Enter command
is not required when reference or broadcast data are sent to the drive.
n
H5-11 and the Enter Command
An enter command is not required when writing registers 0000H to 001FH. Changes to those registers take effect immediately,
independent of the setting in parameter H5-11.
H5-11 Settings H5-11 = 0 H5-11 = 1
How parameter settings are enabled When the Enter command is received from the master. As soon as the value is changed.
Upper/lower limit check
Upper/lower limit check is performed, taking the settings
of related parameters into account.
Checks only the upper/lower limits of the parameters that
were changed.
Default value of related parameters
Not affected. The settings of related parameters remain
unchanged. They must be changed manually if needed.
Default settings of related parameters are changed
automatically.
Error handling when setting
multiple parameters
Data is accepted even if one setting is invalid. The invalid
setting will be discarded. No error message occurs.
Error occurs if only one setting is invalid. All data that
was sent are discarded.
E.10 Enter Command
328
YASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual
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