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I/O Memory Backup Time
The built-in capacitor's backup time for I/O memory during a power interruption is listed below for E-type
CPU Units and N/NA-type CPU Units.
E-type CPU Units: 50 hours at 25°C
N/NA-type CPU Units (without a battery): 40 hours at 25°C
50 hours
40 hours
25 hours
20 hours
9 hours
7 hours
25˚C
The following areas are unstable when power is interrupted for longer than the I/O memory backup
times given above.
• DM Area (D) (excluding words backed up to the EEPROM using the DM backup function)
• Holding Area (H)
• Counter PVs and Completion Flags (C)
• Auxiliary Area related to clock function (A)
Additional Information
Words in the Auxiliary Area related to clock function are unstable. Others are cleared to default
values.
Words
A100 to A199
A300
A351 to A354
A510 to A511
A512 to A513
A514
A515 to A517
A518 to A520
A720 to A749
Precautions for Correct Use
Precautions for Correct Use
Use an N/NA-type CPU Unit with a Battery mounted if it is necessary to retain the contents of the
DM Area (D) and Holding Area (A), the Counter Present Values (C), the status of Counter Com-
pletion Flags (C), and the status of bits in the Auxiliary Area (A) related to clock functions when
the power supply is turned ON after the power has been OFF for a period of time. These con-
tents and status cannot be retained with an E-type CPU Unit.
CP1E CPU Unit Software User's Manual(W480)
CP1E E-type CPU Unit
CP1E N/NA-type CPU Unit
without a battery
40˚C
60˚C
Ambient temperature
Name
Error Log Area
Error Log Pointer
Clock Area
Startup Time
Power Interruption Time
Number of Power Interruptions
Operation Start Time
Operation End Time
Power ON Clock Data 1 to 10
3 CPU Unit Operation
Power interruption time
Less than I/O
Longer than I/O
memory backup
memory backup
time
time
Retained
Unstable
CPU Unit
E-type CPU
N/NA-type
Unit
CPU Unit
Supported
Supported
Supported
Not supported.
Not supported.
Not supported.
Supported
Not supported.
Not supported.
Not supported.
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