FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
246
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 during running, the programming tool must be applicable to the writing function
white running, such as GX Developer.
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 parameters to PLC − 
Writing of comments to PLC − 