Yaskawa DeviceNet Option Card CM059 - Manual (Page 30)

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Data Storage of Option and Drive
The drive with option stores data in four locations:
„ Active RAM memory on the drive
„ Inactive RAM memory on the drive
„ EEPROM memory on the drive
„ EEPROM memory on the option
Data held in RAM memory, both Active and Inactive, is “Volatile”. Data held in Volatile memory will be lost when power is
removed from the drive.
Data held in drive EEPROM and option EEPROM memory is “Non-Volatile”. Data held in Non-Volatile memory will be
retained when power is removed from the drive.
The following table shows which memory location is used for the data available over the DeviceNet network.
The drive Application Parameters are held both in drive EEPROM and drive RAM. On power-up, the drive Application
Parameters that are stored in drive EEPROM memory are transferred to drive RAM memory.
If drive Application Parameters are changed via DeviceNet, the new data will be placed into drive Inactive RAM memory. At
this point, the new data will not be activated or retained if a drive power loss occurs. In order for the new data to be retained,
the ‘ACCEPT’ command must be executed. When the ‘ACCEPT’ command is executed, the new data is transferred into Active
RAM memory. In order for the new data to be retained, the ‘ENTER’ command must be executed. When the ‘ENTER’
command is executed, all of the drive Application Parameters in drive RAM memory are transferred into drive EEPROM
memory.
DataType MemoryType
Drive Runtime Commands
Run/Stop
Frequency Reference Drive RAM
Drive Runtime Status and Diagnostics
Run/Stop Status
Frequency Output
Current Output
Fault Diagnostics
Drive RAM
Drive Application Parameters
A1-00 through o3-02
Drive EEPROM
& Drive RAM
DeviceNet Network Parameters
Polled Consuming Assembly
Polled Producing Assembly
Motor Nameplate Data Option
EEPROM
Power-Up
ENTER
Drive Application
Parameters
Drive Application
Parameters
Drive Application
Parameters
Drive Inactive
RAM
Drive Active
RAM
Drive EEPROM
ENTER
ACCEPT
Drive Runtime
Commands
Drive Runtime
Status/Diagnostics