Mitsubishi Electric MELSEC iQ-R Series User Manual page 200

■When multiple users execute the online change function to one CPU module
Note the following:
• Use engineering tools with the same version.
• Make the option settings the same in all the engineering tools.
• To prevent program block names from duplicating due to debugs by multiple users when adding a program block or
changing a program block name, select "Yes" for "Duplication Check for POU" under [Convert]  [Online Program Change]
in the "Options" window of the engineering tool.
• For editable contents, refer to the following.
Page 190 Editable contents
• Do not make any changes that affect other programs (for example, editing the same program by multiple users, editing
FBs/FUNs/global labels, or having a duplicate program block name or a duplicate global pointer). If one user makes such a
change to a program and execute the online program change function of the engineering tool, and after that, another user
execute the online program change function for another program, the engineering tool will detect a mismatch of data in the
programmable controller. In this case, verify the data in the changed program and data in the CPU module, and check the
mismatched data. Match the data and write the program by using the write to PLC function of the engineering tool, if
needed.
Note that after debugging by multiple users, an appointed person must perform the following operations: Read the project
from the CPU module by using the read from PLC function of the engineering tool, rebuild (reassign) all the data, and write the
project back to the CPU module.
During the file batch online change
The following describes the precautions on the file batch online change.
■Writing the label data
Write labels using the file batch online change only when new label data is added. When the label data is changed or deleted,
write data to the programmable controller or execute the online change (ladder block) after the data is rebuilt (reassigned).
■Falling instruction in the subroutine type FB program
When writing an FB file online, do not use falling instructions in the subroutine type FB program while SM388 (File batch
online change operation setting status) is on.
14 WRITING DATA TO THE CPU MODULE
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14.3 Precautions