Clearing The Flash Memory Of The Plc Function - Mitsubishi Electric A800 Programming Manual

NOTE
• Depending on the setting value of Pr.128 (Pr.753), SD1248 (SD1308) automatically switches between set point and
deviation.
• When Pr.128 (Pr.753) is set to deviation input "70, 71, 90, or 91", the value set as the measured value in (SD1249 (SD1309))
becomes invalid.
• If an out-of-range value is set, the maximum value (or the minimum value) of the setting range is used for operation.
1.15
Clearing the flash memory of the PLC
function
Set Pr.498 to "9696" to clear the flash memory used for the PLC function.
Parameter Name
PLC function flash
498
memory clear
• If the file password (registered by FR Configurator2 (Developer)) of the PLC function has been forgotten, use Pr.498 to
clear the flash memory and unlock the file password.
• The flash memory can only be cleared when the PLC function is disabled (Pr.414 ="0").
• Setting Pr.498 = "9696" clears the flash memory. It takes approximately 30 s at the maximum to clear the flash memory.
• When the flash memory clearing is completed, the Pr.498 value changes to "0" to notify the completion.
• Check if Pr.498 = "0" before turning OFF the inverter power or performing an inverter reset after the flash memory is
cleared.
• When the inverter power is turned OFF or an inverter reset is performed during the flash memory clearing operation, the
flash memory is not cleared properly. The read value of Pr.498 becomes "9696" when the flash memory clearing has not
been completed properly due to turning OFF of the power or the inverter reset. If the read value of Pr.498 becomes "9696",
clear the flash memory according to the following procedure.
- FR-DU08
Set Pr.498 = "0". Then, set Pr.498 = "9696" again to retry clearing.
- FR-LU08 or FR-PU07
Set Pr.498 = "9696" again to retry clearing.
NOTE
• Executing this function clears the PLC function program and all parameters of the PLC function. Create the program and set
the parameters of the PLC function again.
• While the PLC function is enabled (Pr.414 = "1 or 2"), setting Pr.498 = "9696" does not clear the flash memory. When the
flash memory clearing is attempted while the PLC function is enabled, the Pr.498 value changes to "1" to notify that the PLC
function is enabled. Disable the PLC function (Pr.414 = "0"). After the inverter is reset, retry clearing.
• If a value other than "0 or 9696" is set in Pr.498, Er1 (write disable error) will occur.

Clearing the flash memory of the PLC function

Initial Setting
value range
0: Clears the flash memory fault display (no
operation after writing while the flash memory is in
normal operation).
9696: Clears the flash memory (no operation after
writing during flash memory fault).
0, 9696
Other than 0 and 9696: Outside of the setting range
0 (0 to
9999)
0: Normal display
1: The flash memory has not been cleared because
the PLC function is enabled.
9696: During flash memory clearing operation or
flash memory fault
Description
PLC Function
Write
Read
1
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