ISPSoft User Manual 3.3.2.2 CPU Basic Parameter: System In System sub-category page of CPU main parameter category, the page provides CPU parameter settings. Clear Non-latched Device (STOP RUN) When Enable is selected and PLC CPU switches from STOP to RUN, the state of non-latched devices and values are cleared. Y State (STOP RUN) To set the PLC CPU state from STOP to RUN of Y state. Clear : Set all Y device output to OFF. Retain Present State : Output retained to present state. Previous State before STOP : Restore to previous states before STOP. 3-162