FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
272
14 Test Operation, Adjustment, Maintenance and Troubleshooting
14.3 Operation and Test [Power ON and PLC Running]
14.3.3 Program modification function
The sequence program can be transferred while the PLC is running or in the stopped state as shown below.
 : Effective − : Ineffective
*1. Since the writing function is used in running status, the programming tool must support the write during RUN
function, such as GX Works2 or GX Developer.
→ For the writing function during running, refer to Subsection 5.2.5.
*2. GX Works2 Ver. 1.62Q or later is required to execute writing of the symbolic information.
→ Refer to the GX Works2 Version 1 Operating Manual (Common) for
the details on the writing of symbolic information.
Item
In running
status
In stopped
status
Batch writing of file registers (D) and extension file registers (ER) − 
Writing of program to PLC
Partial modification of program

*1

Modification of whole program (batch writing) − 
Writing of symbolic information to PLC
*2

Writing of parameters to PLC − 
Writing of comments to PLC − 
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