FX Series PLC User's Manual - Data Communication Edition
How to Setup Modems on the PLC Side
This chapter explains how to set parameters for initialization using the AT command and set the
communication specifications including the transmission speed for a modem connected to the PLC.
The setting method using GX Works2 and the setting method using FXGP/WIN are explained.
For details on GX Developer operating procedure, refer to GX Developer Operating Manual.
Setting Using GX Works2
This section explains the modem initialization setting and communication setting methods. Suppose that GX
Works2 is already started up.
Screens for the FX
Setting communication by way of RS-232C port
It is not necessary to set the serial communication with a modem.
However, it is necessary to verify that another communication type is not used and whether the
communication setting is correct using the following procedure.
In FX PLCs, the communication setting can be executed using either of the following two methods:
1) Writing the value "0" to the data register D8120 using a sequence program
If another communication type is already set for another application, delete the sequence program which
writes a value to D8120.
When setting remote maintenance to ch1 in an FX
the data register D8120, D8400.
When setting remote maintenance to ch2 in an FX
data register D8420.
2) Setting parameters using a sequence programming tool
By using the following procedure, verify that another communication type is not set.
Opening the PLC parameter setting window
In the project view area of the navigation window, double-click [Parameter] [PLC Parameter].
If the navigation window is not displayed, select [View] [Docking Window] [Navigation] from
the menu bar.
For applicable programming tools, refer to Subsection 1.4.2.
PLC are shown as examples.
5 How to Setup Modems on the PLC Side
PLC, write the value "0" to the
5.1 Setting Using GX Works2
PLC, write the value "0" to