Eeprom Functions - Omron SYSMAC C Series Operation Manual

Functions
5-6-7

EEPROM Functions

1, 2, 3...
The Unit has an internal EEPROM memory which stores the Unit memory map.
When power is applied, the Unit uploads the EEPROM to RAM and begins
execution using the RAM values in the Unit memory map. There is an EEPROM
write function that allows the user to store new default Unit memory map values
that will be uploaded on the next power up of the Unit.
Unit memory map
location
151
152
153
To store the current Unit memory map into EEPROM, do the following.
1. Read Unit memory map location 151.
2. Set Unit memory map location 153 equal to location 151.
3. Turn OFF the execution conditions for all READ/WRIT instructions to the
Unit.
4. Turn ON bit 03 in I/O word n. The Unit will write the Unit memory map to EE-
PROM. The Unit will then increment location 151 by 1. Location 153 must be
updated again to enable another write cycle to take place.
Note 1. The EEPROM has a life of 10,000 write cycles. When writing to the EE-
PROM, use caution to avoid continuous write operations by executing the
ladder logic only one time or updating the location manually using data
memory. The Unit will require a replacement EEPROM at 10,000 write
cycles.
2. During the EEPROM write cycle, the Unit temporarily suspends the cycling
of the Unit good flag in I/O word n+1 bit 07. The cycling resumes after the
EEPROM has been written.
Description
EEPROM write count
EEPROM error flags
1 = 5000 writes to
EEPROM
2 = 10000 writes to
EEPROM
3 = Write disabled to
serial port
4 = Calibration data error
5 = Parameter data error
6 through 15 reserved
EEPROM compare word
Section 5-6
Valid data
0000 to 9999
0 or 1
0000 to 9999
93