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Connecting with 1:N NT Links
Section 3-5
3-5
3-5-1
Connecting with 1:N NT Links
Connection Methods
This section describes the methods used to connect NP-series PTs using the
1:N NT Link protocol.
The COM2 serial port of the PT is used. This connection method can be used
for 1:N NT Link connections (normal, high-speed).
PT
Host
RS-422A/RS-485 cable
Supported Host Units
The OMRON PLCs that can be connected in 1:N NT Links are limited to the
CS-series, CJ-series, CP-series, and C-series PLCs. CS-series PLCs can
also be connected in 1:N NT Links by using a CS1W-SCU21 Serial Communi-
cations Unit. CJ-series PLCs can also be connected in 1:N NT Links by using
a CJ1W-SCU41 Serial Communications Unit.
Check the series and model of the PLC and the model of the Board or Unit
that is mounted to the PLC when connecting the PTs to the host.
For details on the Units used as hosts that can be connected in 1:N NT Links,
refer to Appendix E Standard Models .
To use the COM2 serial port, the SW2 DIP switch on the back of the PT must
be set.
Pin No. Function
Pin 1 COM2 RS-422A/485 set-
ting
Pin 2 COM2 RS-422A/485 set-
ting
Pin 3 COM2 terminating resis-
tance setting
ON
RS-485
RS-485
Terminating resis-
tance enabled
OFF
RS-422A
RS-422A
Terminating resis-
tance disabled
Pin 4
Not used
---
---
Reference CS-series PLCs with -V1 suffix support high-speed 1:N NT Links as well as
normal 1:N NT Links. CS-series PLCs without the -V1 suffix can also be con-
nected to high-speed 1:N NT Links if the latest Serial Communications Board/
Unit is used. Refer to 3-6 High-speed 1:N NT Links for details.
29
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