Eeprom (Mode 26) - Siemens SIMATIC S5 Manual

IP 266

5.3.20 EEPROM (Mode 26)

EEPROM
Mode
You can use this mode to transfer data from the IP 266's RAM to EEPROM or from
EEPROM to the IP's RAM.
Mode 26 always transfers all available data from the source to the destination,
i. e. the machine data and all traversing programs.
Note:
This mode can be invoked only in a STEP 5 program (see Section 7).
These functions can also be invoked in the COM 266 "TRANSMIT" (TRANSFER)
form (see Section 6.4.2).
This mode is started automatically on the IP 266 run-up that follows a "Power
ON". The IP 266 outputs an error message when the EEPROM contains no valid
machine data.
The service life of an EEPROM chip is 10,000 write cycles.
Example:
The IP 266's RAM contains the following data block:
• One machine data record in DB1
• Several traversing programs in DB1 to DB4
When the mode is started for RAM EEPROM, both the machine data and the
traversing programs are transferred. Any data in the EEPROM prior to the trans-
fer is overwritten with the new data.
EWA 4NEB 812 6057-02
Machine Data, Modes and Traversing Programs
Direction Start
Parameters Function
5-65