10 ONLINE CHANGE
10.1 Online Ladder Block Change
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The cautions at the time of repeatedly performing online change
When online change is performed repeatedly, RUN writing may not be able to be carried out due to insufficient memory in the
CPU module. Please set the CPU module to STOP and write the program.
The size of the target data at online change
When the size of the target data of online change exceeds 192 K bytes, online change fails and an error message is displayed
on the engineering tool. The target data size may exceed 192 K bytes in the following cases:
• When the capacity of the edited program file exceeds 192 K byte
• When the total capacity of multiple edited program files exceeds 192 K byte
In the above mentioned cases, divide the program file in advance to reduce each file size, avoid performing online change to
multiple program files all at one time (perform online changes to a few files at a time), or take other actions.
*1
*1 Usually, online change is performed to only edited files. However, in the following cases, online change is performed to a file other than
the edited file.
When a global label or structure is changed, the program using the changed global label and structure is a target of online change.
When FB or FUN is changed, the program using the changed FB and FUN is a target of online change.
For confirmation of the target file for online change and the file capacity, refer to the following.
GX Works3 Operating Manual
Separate writing of a program and program restoration information
When writing data to a CPU module by using the online program change function, a program and program restoration
information can separately be written by setting "Yes" for the following option.
[Tool] [Options] "Convert" "Online Program Change" "Operational Setting" "Divide to Write a Program and
Program Restore Information"
By writing a program and program restoration information separately, an error that occurs when the capacity of data to be
written to a CPU module exceeds the maximum writable capacity may be cleared.
For supported version of separate writing of a program and program restoration information, refer to Page 942 Added and
Enhanced Functions.
• It may take time to write data when writing a program and program restoration information separately.
• A project is automatically saved with the data writing. Therefore, it is necessary to register the project history in advance.
• If a project is not saved automatically, the data will also not be written to a CPU module.
• When writing fails, reset or cycle the power of the CPU module. Then, write the data to the CPU module in the STOP state.
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