YASKAWA Varispeed G7, Modbus Communication Manual

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ENTER/ACCEPT Command (Write Only)
Caution
The following section describes the usage of the ACCEPT and ENTER commands, which are necessary when writing to certain registers in the
G7 drive.
When data is written to a Command register (000h ~ 0FFh) in the G7, the data is activated as soon as it is written, but will be gone when power
is lost (volatile memory or RAM). When data is written to a Parameter register in the G7 (100h ~ 7FFh), the data goes into a temporary off-line
memory area. The drive will essentially ignore the off-line memory area until it is told to use it. In order to get the drive to use this data, an
ACCEPT or ENTER command needs to be issued. If power is lost prior to an ACCEPT or ENTER command being issued, the data is lost.
Using this temporary storage area is a good way to pre-load several parameter changes, and then activating them all at once.
Both the ACCEPT and the ENTER commands will activate the data contained in the off-line memory area. The ACCEPT command simply
activates all of the data in the off-line memory area, but if power is lost, all of the changes will be lost. The ACCEPT command can be
performed as many times as needed. An ACCEPT command is performed by writing a value of zero to address 0910h.
The ENTER command will activate the data in the off-line memory area AND store it to nonvolatile (EEPROM) memory. Once the ENTER
command is issued, the data will be retained even if the power is lost. Excessive use of the ENTER command can cause the G7 drive to fail.
The nonvolatile memory allows approximately 100,000 ENTER commands. An ENTER command is performed by writing a value of zero to
address 0900h.
If any parameter register has been written to using network communication, but no ENTER or ACCEPT command is given, a "Busy Write
Protected" error can occur if the digital operator is used to try and change any parameters. This error can be cleared by either issuing an ENTER
or ACCEPT command or by cycling power to the drive.
Table 4.16 Enter/Accept Command
Address Function Data Description
910 ACCEPT 0 Transfer data to active RAM. Data will be lost at power down. Unlimited usage.
900 ENTER 0 Transfers data to non-volatile storage. Data will survive power loss. Limited to 100,000 writes.