Omron NS - REV 12 Setup Manual page 125

Setting the Communications Board Switches
• Using RS-422A
Set the switches of the C200HX/HG/HE(-Z) Communications Board, as follows:
Switch 1: 4 (Four-wire method = RS-422A)
Switch 2: ON (terminator ON = terminating resistance used)
Set the switches of the CQM1H Serial Communications Board as follows:
Two-wire/four-wire switch (WIRE):
Terminating resistance switch (TERM): ON (terminator ON = terminating resistance used)
Serial Communications Board
(Inner Board slot 1)
Terminating resistance switch
Set to ON (right position).
Two-wire/four-wire switch
For RS-422A: Set to 4 to
use four-wire (right position).
Connecting a CS-series CPU Unit
When a CS-series CPU Unit is connected, settings are required in the PLC Setup and on the
front-panel switches of the CPU Unit.
PLC Setup
There are two methods that can be used to change the parameters in the PLC Setup.
• CX-Programmer
• Programming Console
Using the CX-Programmer
If one or more parameters in the PLC Setup in the CPU Unit has been previ-
Precautions
for Safe Use ously changed, always upload the PLC Setup from the CPU Unit and make any
new changes in the uploaded copy so that you do not overwrite the previous
changes.
1. Open the project file in the CX-Programmer and select PLC - PLC Information - PLC
Settings from the menus.
2. The PLC Settings Dialog Box will be displayed. Click the tab for the port to which the PT
is connected and change the following three parameters. (The following screen capture is
provided as an example. The parameters that are actually displayed will depend on the
model of the CPU Unit and the port.)
4 (Four-wire method = RS-422A)
4-2 1:N Host Connection
4-9