Write Processing And Clear Processing Execution Timing; Communications By Network Number/Station Number - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Write processing and clear processing execution timing

• Executing the write or clear processing to the IP address storage area may not be possible if an operation that turns off and
on, or on and off an IP address storage area write request or IP address storage area clear request in a short time is
performed.
• If the IP address storage area write request is turned off and on again while writing to the IP address storage area, 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 the IP address storage area clear request is turned off and on while writing to the IP address storage area, the clear
operation will not be completed. (This applies to the write operation if writing is executed during the clear processing.)
• If both an IP address storage area write request and IP address storage area clear request are turned off and on, the write
operation will be executed as top priority, and the clear operation will not be completed.
• If the write operation and clear operation are performed on the IP address storage area in the RJ71EN71 or the RnENCPU
(network part), communication may be stopped. Execute requests while control is not being performed at P1 or P2.

Communications by network number/station number

• For the network number, station number, and transient transmission group number (RJ71EN71 or RnENCPU (network part)
only), the values in the IP address storage area have precedence over the module parameter values. To use the network
number, station number, and transient transmission group number specified in the module parameters, clear the IP address
storage area.
• When the IP address is stored in the IP address storage area, if the network number, station number, and transient
transmission group number (RJ71EN71 or RnENCPU (network part) only) are not stored, communications using the
network number and station number become impossible. For communications using the network number and station
number, even if not changing the values, store the network number, station number, and transient transmission group
number in the IP address storage area.
Execution of the IP address change function during execution of another function
During execution of the CPU module data backup/restoration function, the IP address change function of the CPU module
(built-in Ethernet port part) cannot be executed. Check that the CPU module data backup/restoration function is not being
executed and then execute the IP address change function.
1 FUNCTIONS
218
1.16 IP Address Change Function