eWON General Reference Guide - Esco Drives & Automation

General Reference GuideeWON ConfigurationFlash Memory zone Size DescriptionHistorical dataRetentive valuesSystem ConfigCommunication Config/usr partition/sys partition1 to 3 MB64 KB256 KB64 KB1 to 16 MB0 to 1 MBUsed for storing historical data. This file system is located in its own partition.This partition contains 3 files that contain circular data:• Incremental recordings• Events logging• Alarm history loggingEach of those files receives a predefined maximum amount of space. When thisamount of space is reached, then the older data are erased, in order to free space forthe new data.This is a fixed flash memory block that contains the retentive values.The dimension of that block does not need to be modified.The System configuration is:• All eWON parameters (except COM)• All Tags definitions• All Users definitionsThe communication configuration needs to be saved in a distinct block in order toallow formatting any other data in the eWON without risking to loose contact with thedevice (Ethernet IP address, PPP configuration etc.).This configuration uses a fixed memory size and is stored with a special mechanismthat prevents loosing the configuration even if power is lost at any time during theconfiguration update.The only risk is to loose the last modification made after last save occurred.Communication Configuration consists in all the configuration information thatappears in the ComCfg.txt file.This partition uses a different file system, allowing to create a larger number of filesand to use a larger total flash memory.This file system is also very robust in case of power lost during the time whenoperations are performed on the files.This partition can be used through the eWON’s FTP server or using the eWON’sBASIC scripts.If the /sys partition does not exists, the program and the configuration are then storedin this partition (see below: /sys partition).This partition uses the same file system as the /usr partition described above.Its function is to store the program and the configuration.The configuration includes all the information that appear in the config.txt file.When this partition is formatted, the configuration and the program are erased, butthe current configuration and program are still in memory.If the eWON is rebooted at that moment, it will use after restarting a defaultconfiguration and an empty program.When the configuration or the program are saved, the eWON uses this partition tosave a config.sys and a program.sys files. These files are used internally by theeWON and should not be modified by the user.If the partition size is set to 0 MB (eWON with only 8MB), then the partition is notcreated, and all /sys data are saved in the "/usr" partition.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 64