3-7
3 CPU Unit Operation
CP1E CPU Unit Software User’s Manual(W480)
3-2 Backing Up Memory
3
3-2-3 I/O Memory Backup
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
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.
Precautions for Correct UsePrecautions 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.
I/O Memory Backup Time
Words Name
Power interruption time CPU Unit
Less than I/O
memory backup
time
Longer than I/O
memory backup
time
E-type CPU
Unit
N/NA-type
CPU Unit
A100 to A199 Error Log Area Retained Unstable Supported
Supported
A300 Error Log Pointer Supported
A351 to A354 Clock Area Not supported.
A510 to A511 Startup Time Not supported.
A512 to A513 Power Interruption Time Not supported.
A514 Number of Power Interruptions Supported
A515 to A517 Operation Start Time Not supported.
A518 to A520 Operation End Time Not supported.
A720 to A749 Power ON Clock Data 1 to 10 Not supported.
25˚C 40˚C 60˚C
50 hours
40 hours
25 hours
20 hours
9 hours
7 hours
Backup time for I/O memory
CP1E E-type CPU Unit
CP1E N/NA-type CPU Unit
without a battery
Ambient temperature
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