Mitsubishi Electric Q01UCPU User Manual page 312

(3) Device memory or initial device value file, and writing parameter
Settings for the write-protect function for device data (from outside the CPU module) are enabled at the following
timing:
• The CPU module is powered off and on.
• The CPU module is reset.
• The operating status of the CPU module is switched from STOP to RUN.
• Data are written to the CPU module.
If the parameter in which the write-protect function for device data (from outside the CPU module) is enabled at
the same time when the device memory or initial device value in the write-protected range are written, the
parameter is written first and instantly enabled. Consequently, an error occurs at writing the device memory or
initial device value.
Write the device memory or initial device value before writing the parameter.
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