Omron SYSMAC CS Series Operation Manual page 170

Expanded System Configuration
NT Link System (1:N Mode)
1:N Mode 1:N Mode
RS-232C
Programmable
Terminal
132
CPU SCU
RS-232C
RXDU
TXDU
General-purpose
external device
RXD
TXD
General-purpose
external device
Note 1. Set pin 5 of the DIP switch on the front panel of the CPU Unit to OFF, and
set the serial communications mode in the PLC Setup to no-protocol com-
munications.
2. No-protocol communications are supported for Serial Communications
Units with unit version 1.2 or later only.
If the PLC and Programmable Terminal (PT) are connected together using
RS-232C ports, the allocations for the PT's status control area, status notify
area, objects such as touch switches, indicators, and memory maps can be
allocated in the I/O memory of the PLC. The NT Link System allows the PT to
be controlled by the PLC, and the PT can periodically read data from the sta-
tus control area of the PLC, and perform necessary operations if there are any
changes in the area. The PT can communicate with the PLC by writing data to
the status notify area of the PLC from the PT. The NT Link system allows the
PT status to be controlled and monitored without using PLC ladder programs.
The ratio of PLCs to PTs is 1: n (8 ≥ n ≥ 1).
Set the PT communications settings for a 1:N NT Link. Either one or up to
eight PTs can be connected to each PLC.
Version-1 CPU Units support high-speed NT Links (1:N mode). In this way,
equipment monitoring and settings can be made faster from the PT. The appli-
cable PTs are the NS-series PTs, the NT31(C)-V2 and the NT631(C)-V2.
RS-232C
RS-232C to RS-422/485
Conversion Adapter
RS-422A/485
Programmable Programmable
Terminal Terminal
Applicable port
Serial
CPU Unit
Communications
Unit (SCU)
RS-232C port
Peripheral port
No Yes
(See note 1.)
Applicable port
CPU Unit
Peripheral port RS-232C port
Yes Yes
(See note 1.) (See note 2.)
Note 1. Turn ON pin 4 on the DIP switch on
the front of the CPU Unit and set the
serial communications mode in the
PLC Setup for an NT Link.
2. Turn OFF pin 5 on the DIP switch on
the front of the CPU Unit and set the
serial communications mode in the
PLC Setup for an NT Link.
Programmable
Terminal
Section 2-5
Yes
(See note 2.)
Serial Serial
Commu- Commu-
nications nications
Board Unit
Yes Yes