Mitsubishi Electric MELSEC-Q Series Programming Manual page 175

■Precautions
• If GX Works executes online change (inactive block) while another GX Works2 executes online change or program backup,
the online change (inactive block) cannot be performed. The online change (inactive block) cannot be performed, if another
GX works executes online change or program backup while GX Works2 executes online change (inactive block).
• After addition of SFC steps, if the number of SFC steps exceeds the number of step relay (S) points set in the Device tab of
the PLC parameter dialog box, the online change (inactive block) cannot be performed.
• When online change (inactive block) is executed during boot operation from a memory card, the original program in the
memory card will not be changed.
• If the CPU module is powered off and then on or is reset before termination of online change (inactive block), the changes
in the target program will not be reflected.
• When the CPU module is set to STOP and an SFC program is written to the CPU module, online change (inactive block)
cannot be executed to the SFC program until when the CPU module is set to RUN.
• When multiple SFC programs of scan execution type are registered and "CAN'T EXE.PRG." (error code: 2504) occurs,
online change (inactive block) cannot be executed.
6 SFC PROGRAM EXECUTION
6.6 Operation at Program Change
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