Chapter 2 Devices 2_ 2-39 Special auxiliary Refresh time relay OFF: the PLC stops. SM218 The system checks the real-time clock at power-on. ON: real-time clock error You reset it to OFF. SM219 The system monitors the battery power of the real-time clock. ON: real-time clock power is low The system resets it to OFF. SM220 You set SM220 to ON and reset it to OFF. ON: calibrating the real-time clock within ±30 seconds SM221 The flag is refreshed according to the settings in HWCONFIG or when the DST instruction (API 1607) is executed. ON: the DST instruction is executed.
SM222 The flag is refreshed during calibration SM227~SM229 The flag is refreshed when the CPU is supplied with power SM270–SM275 The flag is ON when the CSFO instruction is executed. ON: enable reversing the input direction OFF: disable reversing the input direction SM281–SM288 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM291–SM296 You set the flag to ON and reset it to OFF. ON: enable clearing the input points OFF: disable clearing the input points SM300 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM301–SM303 The system sets the flag to ON and reset it to OFF. ON: counting down OFF:
counting up SM304 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM305–SM307 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM308 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM309–SM311 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM312 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM313–SM315 You set the flag to ON and reset it to OFF. ON: counting down OFF: counting up SM316 You set the flag to ON and reset it to OFF.