Precautions - Mitsubishi Electric FX5 User Manual
Melsec iq-f series, ethernet communication
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12.5
Precautions
The following section lists the precautions for using the IP address change function.
Power off and reset operation
Do not turn the CPU module power off or execute reset when writing to or clearing the IP address storage area (CPU module
internal FRAM). The values may not be applied to the IP address storage area (CPU module internal FRAM). Power off or
reset the CPU module after checking the falling edge of SM8492 (IP address storage area write request) or SM8495 (IP
address storage area clear request).
Parameter IP address
For the CPU module IP address, the value in the IP address storage area (CPU module internal FRAM) has precedence over
the module parameter Ethernet port value. Whether the IP address change function is enabled can be checked by the IP
address change function enable flag (SM8498). When using the IP address specified with the module parameter Ethernet
port, clear the IP address storage area (CPU module internal FRAM).
Write processing and clear processing execution timing
• It may not be possible to execute the write or clear processing to the IP address storage area (CPU module internal FRAM)
if an operation that turns off and on, or on and off SM8492 (IP address storage area write request) or SM8495 (IP address
storage area clear request) in a short time is executed.
• If SM8492 (IP address storage area write request) is turned off and on again while writing to the IP address storage area
(CPU module internal FRAM), the write processing that was executed first will complete normally, and the following write
operation will be ignored. (This also applies to the clear operation.)
• If SM8495 (IP address storage area clear request) is turned off and on again while writing to the IP address storage area
(CPU module internal FRAM), the clear operation will not be completed. (This also applies if writing is executed during the
clear processing.)
• If both SM8492 (IP address storage area write request) and SM8495 (IP address storage area clear request) are turned off
and on, the write operation will take priority, and the clear operation will not be completed.
12 IP ADDRESS CHANGE FUNCTION
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12.5 Precautions
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