Chapter 3 PLC System Configuration & Settings (9) When setting values are not required temporarily, click OK to apply the setting. The setup is saved once an ISPSoft project is saved. (10) Besides using the setting window to write the setting values of functions into PLC hosts, the retentive range in a project setting can also be written into PLC hosts when project program is downloaded. Users PLC hosts. For more details on download, please refer to section 17.1.3. only need to select Retentive Range from the Transfer Setup window and click OK to download data to 3-215