ISPSoft User Manual (6) Click Default for settings to return to default values and the retentive function for all devices will return to defaults. (7) When ISPSoft is connected to a PLC host, click Read from PLC to read the retentive setups on all devices from the PLC host. (8) When all setting is complete and ISPSoft is in connection with a PLC host, click Set in PLC to write the retentive settings for all devices into PLC hosts. Meanwhile, the system will automatically close the setting window and the setups are stored, but it will be saved once an ISPSoft project is saved. 3-214