B–16 Supported Block Transfer Messages
Save/Recall/Initialize
Save/Recall/Initialize—NVS (Non-Volatile Storage) Functions—
activates the specified function. These functions are also referred to as
EEPROM functions.
PLC Block Transfer Instruction Data
PLC request instruction length: 4 words
Drive response instruction length: 4 words
Figure B.10 Message Structure
Message Operation
This function allows three different message requests:
• NVS Save saves parameter information from the working
memory or RAM to NVS Storage.
• NVS Recall retrieves the last saved data from NVS Storage and
places it in the working memory or RAM.
• NVS Default Initialize clears the RAM and NVS Storage and sets
all parameter values to default.
If an error has occurred, response word 1 returns a value of -31998.
Example
This example requests the NVS Storage Save function be performed.
Data File Format
* Example only — These values vary depending on parameters and products.
Header
Word 0
PLC Decimal Value
–31998
Header
Word 1
Header
Word 2
PLC Request
Header Word 0
Header Word 1
Header Word 2
Message Length
Message Length
PLC Decimal Value
770 — Message OK
–31998 — Message Error
0
Drive Response
4
0
Data Word 3
NVS Command
Value NVS Command
00
01
02
03
Not Used
NVS Save
NVS Recall
NVS Default Initialize
4
Data
Word 3
0 or Error Code
0123 456789
PLC request 4 –31998 0* 0, 1, 2, or 3
Drive response 4 770 0* 0*
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