Power Off Operation - Omron SYSMAC CS1D-PD Series Operation Manual

Power OFF Operation

I/O Memory
Hold Bit status
Mode changed
(A50012)
between
PROGRAM
and RUN/
MONITOR
OFF Cleared
ON Held
9-3

Power OFF Operation

1,2,3...
1,2,3...
352
2. The cycle time will increase by approximately 10 ms when the operating
mode is changed from MONITOR to RUN mode. This will not, however,
cause an error for exceeding the maximum cycle time limit.
I/O Memory
Operation stopped
Fatal error
other than
FALS
Cleared Held
Held Held
Refer to 8-2 I/O Memory Areas for more details on I/O Memory.
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%
of the rated voltage while the CPU Unit is in RUN or MONITOR mode.
1. The CPU Unit will stop.
2. Outputs from all 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:
AC power: 85 V for a 100 V AC system and 170 V for a 200 V AC system
The following processing will be performed if power drops only momentari-
ly (momentary power interruption).
1. The system will continue to run unconditionally if the momentary power in-
terruption lasts less than 10 ms, i.e., the time it takes the rated voltage at
85% or less to return to 85% or higher is less than 10 ms.
2. A momentary power interruption that lasts more than 10 ms but less than
25 ms is difficult to determine and a power interruption may or may not be
detected.
3. The system will stop unconditionally if the momentary power interruption
lasts more than 25 ms.
If operation stops under the conditions given in items 2 and 3 above, the tim-
ing used to stop operation can be delayed by setting the Power OFF Detec-
tion Delay Time (0 to 10 ms) in the PLC Setup. Operation, however, will
always be stopped 10 to 25 ms after detecting a momentary power interrup-
tion regardless of the setting in the PLC Setup.
Output bits allocated to Output Units
Mode changed
between
FALS
PROGRAM
executed
and RUN/
MONITOR
OFF
Held
Section 9-3
Operation stopped
Fatal error FALS
other than executed
FALS
OFF OFF
OFF OFF