58
Power OFF Operation
Section 2-6
2-6
Power OFF Operation
2-6-1
Overview
The following processing is performed when CPU Unit power is turned OFF.
Power OFF processing will be performed if the power supply voltage falls
below the specified value while the CPU Unit is in RUN or MONITOR mode.
1,2,3...
1.
The CPU Unit will stop.
2.
Outputs from all Output Units will be turned OFF.
Note
(1) All outputs will turn OFF despite the status of the I/O Memory Hold Bit or
I/O Memory Hold Bit at power ON settings in the PLC Setup.
(2) DC Power
85% of rated voltage: 20.4 V DC or less
The following processing will be performed if power drops only momentarily
(momentary power interruption).
1,2,3...
1.
The system will continue to run unconditionally if the momentary power in-
terruption lasts less than 2 ms for DC power, i.e., the time it takes the rated
voltage at 85% or less to return to 85% or higher is less than 2 ms for DC
power.
2.
A momentary power interruption that lasts more than 2 ms for DC power
may or may not be detected.
10 ms
0
85% of the rated voltage or less or DC power
0 to 2 ms for DC
Momentary power
interruption not detected
and operation continues.
Greater than 2 ms for DC
Operation will continue or stop
depending on whether or not a
momentary power interruption is
detected.
Power supply
voltage
Power supply
voltage
Time
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......