Omron NT11 - 01-2004 User Manual page 69

Connection to a PLC by the NT Link (RS-422A Type)
56
The 1:1 NT Link method cannot be used using RS-485. To use the 1:1 NT
Link method, connect by RS-422A.
NT link connection using RS-422A/485 is not possible with the CPM1,
CPM2A, and CPM2C.
Settings at the Host
The setting methods for each model of Unit are described below.
• Connecting to a CVM1/CV-series (-EV@) CPU Units
CVM1-CPU01-EV2/CVM1-CPU11-EV2/CVM1-CPU21-EV2
PLC Setup
When connecting to the CVM1/CV-series CPU Unit by the 1:1 NT Link
method, no particular settings are required at the PLC Setup.
Setting the Front Switches
I/O port selector switch
RS-232C
RS-422A
Connecting to a C-series C200HX/HG/HE(-Z)E or CQM1H
PLC Setup Settings
Write the PLC Setup (data memory) settings directly from a Programming
Device (e.g., CX-Programmer) in accordance with the host model.
Host Model
Port A of C200HX/HG/HE(-Z)E
*2
Port 2 of CQM1H
*1 RS-422A port of the Serial Communications Board
*2 RS-422A port of the Serial Communications Board
For details on operations relating to the PLC Setup, refer to the manual for the
PLC you are using.
Setting the DIP Switches on a C200HX/HG/HE(-Z)E Serial
Communications Board
Set the switches on a C200HX/HG/HE(-Z)E Serial Communications Board as
follows.
Switch 1: Set to 4 (4-wire, for RS-422A)
Switch 2: Set to ON for terminator ON (terminating resistance applied)
• Host Link communication method selection
(selector switch)
Set this to RS-422A.
• Communications type setting (pin 3)
Set this switch to ON.
(for communication by NT link)
• Terminator setting (pin 6)
Set this switch to ON.
(Set terminator ON.)
Word Writing Value
*1 DM6555 4000
DM6550 4000
Section 2-7
Setting
Use 1:1 NT Link