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MELSOFT
6 COMMUNICATION SETTING EXAMPLES OF THE UTILITY SETTING TYPE
(4) FX extended port
Set the FXCPU parameters with GX Developer before using FX extended port to
perform communication. Carry out either of the following two setting methods.
• To use the PLC parameters
• To write values to special data registers (D8120, D8121, D8129) in a sequence
program. (For FX
0NCPU, only this method is applicable.)
The following shows the setting items.
(a) Settings with PLC parameters
Start GX Developer and select [Parameter]-[PLC parameter] in the project
list. And then, select the <<PLC system (2)>> tab.
Item Setting value
Operate communication setting Check the corresponding check box.
Protocol Dedicated protocol
Data length 7/8
Parity None/ Odd/ Even
Stop bit 1/2
Transmission speed
300bps/600bps/1200bps/2400bps/4800bps
/9600bps/19200bps
H/W type RS-485
Sum check no/yes
Transmission control procedure Form1
Station number setting 00H to 0FH
Time out judge time 1 to 255
POINT
• When communication setting is made, power the FXCPU again after writing to
programmable controller.
• When performing multi-drop connection, make the same communication settings
for the devices. However, make sure that the station No. is not overlapped.