1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

522 Recipe and Data LoggingExample Maximum record of String dataString Length of RecordThe size of a record is limited so that the length of the maximumformatted string does not exceed 109 characters. The following table canbe used to determine the formatted string length.Data Memory Consumed Formatted String Sizedelimiter 0 bytes 1 characterdate 2 bytes 10 characterstime 2 bytes 8 charactersstring element 84 bytes 89 charactersFor queue 0, the formatted string length is 29 characters, as shown below:Data Date Time StringCharacters 10 1 8 1 89= 10 + 1 + 8 + 1 + 89 = 109 charactersNumber of RecordsUsing Queue 0 as an example, each record consumes:Record FieldDateTimeST10:0Integrity CheckTotalMemory Consumption2 bytes2 bytes84 bytes2 bytes90 bytesEach record consumes 90 bytes. So if only one queue was configured, themaximum number of records that could be stored would be 1456. Themaximum number of records is calculated by:Maximum Number of Records = Data Log File Size/Record Size= 128K bytes/90 bytes= (128)(1024)/90= 1456 recordsPublication 1766-RM001A-EN-P - October 2008