7. System settings7.13 Retention function7.13 Retention functionOnly possible with easySoft 7.It is a requirement of system and machine controllers for operating states or ACTUALvalues to have retentive settings. What this means is that the values will be retaineduntil the next time the ACTUAL value is overwritten.There are two input fields (for the start and end values of the retention range) each formarkers and for the following function blocks.Project view/ System settings tabFigure 226: Screenshot of Retention section that can be found in the System settings tab in the Projectview (including sample values)Value range for the function blocks, instances that can be stored retentively:l C - Counter relay : 01…32l CH - High-speed counter : 01…04l CI - Incremental counter : 01…02l DB - Data function block : 01…32l T - Timing relay : 01…32For more information, please refer to the description for the relevant function block.Marker value ranges:l MB : 1 …512l MW : 1…512l MD : 1…256The values from the input field will be automatically converted to MB marker bytes.Retention bytesThe entire retentive marker range for an easyE4 must not exceed 400 bytes. The total ofthe retention bytes for the main program and user function blocks (UF) will be displayedin the Project view, in the System settings tab. If the retentive marker range exceeds400 bytes, a red negative number will be shown in the Free field in order to indicate this.Retain retention during transfereasyE4 11/18 MN050009 EN www.eaton.com 473
