No. Field name Example (hex)
7 CRC-16 (MSB) 7A
8 CRC-16 (LSB) C3
*1. Note that the register address is 08FF hex, which is 1 less than the register number 0900 hex.
8-6-2
EEPROM Write Mode
• To set the EEPROM write mode, use the Write to Holding Register (06 hex) command etc. to write 1
to the holding register for the EEPROM write mode (0902 hex).
• In the EEPROM write mode, the data changed by the Write to Holding Register (06 hex) command
is written to both the RAM (volatile memory for operation) and the EEPROM (non-volatile memory
for storage). Then, the EEPROM write mode is canceled.
•
The EEPROM write mode is canceled also if a command other than the Write to Holding Register
(06 hex) command is received in the EEPROM write mode.
• If a continuous write command is received from Write to Multiple Holding Registers (10 hex) or
Read/Write from/to Multiple Holding Registers (17 hex) in the EEPROM write mode, data writing will
be accepted, but not written to EEPROM.
• When Sysmac Studio is connected online while in the EEPROM write mode, the EEPROM write
mode is canceled.
• If “0: Save to non-volatile memory” is set in Communication Data Storage Selection (y97), this will
always operate corresponding to EEPROM write mode regardless of this register.
• To change parameter y97, the “
key + / keys” must be pressed simultaneously.
Difference between enter command and EEPROM write mode
3G3M1
3G3M1
Parameter change
Writes data to RAM
Writes data to RAM
Writes data to RAM
Writes all data
to EEPROM
Writes data to RAM
Writes data to RAM
and EEPROM
(changed data only)
EEPROM write
mode enabled
902h=1
Master Master
Enter command
Parameter change
Parameter change
Parameter change
Parameter change
Enter command
900h=1
EEPROM write mode
EEPROM write mode is
enabled only for a single
parameter change
operation.
8 Communications Functions
8-22
M1 Series Standard Type User's Manual (I669)
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