Mitsubishi Electric MELSEC-Q Series User Manual page 97

(4) Precautions
For cyclic data assurance of more than 32 bits, use the following method.
• Enable the Block Data Assurance per Station setting. (Refer to Section 7.4, Refer to
Section 8.3.4.)
POINT
When the CPU module is turned off and on or reset, data in latched devices (the
devices listed in the "CPU module device" column in the table below) may be
output depending on the timing of the link scan and link refresh even if the data are
cleared to zero on a sequence program.
Execute the actions listed in the "How to disable the setting" column in the table
below not to output the data in the latched devices.
CPU module device
Latch relay (L), file register (R, ZR)
Extended data register (D), extended link
register (W), device within the latch range
(Note-1): For the initial device value setting, refer to the user's manual (Function Explanation, Program
Fundamentals) for the CPU module used.
Use the initial device value to clear the device to 0.
(Note-1)
Delete all the latch range settings.
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Chapter 8 FUNCTIONS
How to disable the setting