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Power OFF Operation Section 10-3
10-2-3 Operating Mode Changes and I/O Memory
Note 1. The following processing is performed depending on the status of the I/O
Memory Hold Bit. Output from Output Units will be turned OFF when oper-
ation stops even if I/O bit status is held in the CPU Unit.
2. the cycle time will increase temporarily by approximately 10 ms when the
operating mode is changed from MONITOR to RUN mode.
Note See Chapter 7 Memory Areas, etc. for more details on I/O Memory.
10-3 Power OFF Operation
The following processing is performed if CPU Unit power is turned OFF.
Power OFF processing will be performed if the power supply falls below 85%
(80% for CJ1W-PD025 DC Power Supply Units or 90% for CJ1W-PD022 DC
Power Supply Units) of the minimum rated voltage while the CPU Unit is in
RUN or MONITOR mode.
1,2,3... 1. The CPU Unit will stop.
2. All outputs from Output Units will be turned OFF.
Note All output will turn OFF despite an I/O Memory Hold Bit or I/O Memory Hold
Bit at power ON settings in the PLC Setup.
85% of the rated voltage:
85 V AC for 100 to 240 V (wide range)
DC Power Supply Units:
CJ1W-PD025: 19.2 V DC
CJ1W-PD022: 21.6 V DC
Mode Changes Non-holding areas Holding Areas
• I/O bits
• Data Link bits
• CPU Bus Unit bits
• Special I/O Unit bits
• Work bits
• Timer PV/Completion Flags
• Index Registers
• Data Registers
• Task Flags
(Auxiliary Area bits/words are hold-
ing or non-holding depending on the
address.)
• HR Area
•DM Area
•EM Area
• Counter PV and Completion Flags
(Auxiliary Area bits/words are hold-
ing or non-holding depending on the
address.)
RUN or MONITOR to PROGRAM Cleared (See note 1.) Held
PROGRAM to RUN or MONITOR Cleared (See note 1.) Held
RUN to MONITOR or
MONITOR to RUN
Held (See note 2.) Held
I/O Memory
Hold Bit status
(A50012)
I/O Memory Output bits allocated to Output Units
Mode changed
between
PROGRAM
and RUN/
MONITOR
Operation stopped Mode changed
between
PROGRAM
and RUN/
MONITOR
Operation stopped
Fatal error
other than
FALS
FALS
executed
Fatal error
other than
FALS
FALS
executed
OFF Cleared Cleared Held OFF OFF OFF
ON Held Held Held Held OFF OFF
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