Omron NT31 Setup Manual

95
Connecting to the Host’s RS-422A/485 Port Section 5-2
This connection method can be used only with the NT link (1:N) meth-
od (standard or high-speed) of type RS-485.
• Method in which the RS-422A ports of multiple NT31/NT31Cs and the
RS-422A port of the host are connected in a 1:N connection (page 121).
This connection method is used with the RS-422A type NT link (1:N)
method (standard or high-speed).
• Method in which the RS-485 ports of multiple NT31/NT31Cs and the RS-
485 port of the host are connected in a 1:N connection (page 124).
This connection method is used with the RS-485 type NT link (1:N)
method (standard or high-speed).
Note One end of the wire must always be connected to the host (PLC), and there
must be no branching. Branching will cause problems such as transmission
delays and communications failures.
Reference: CS/CJ-series CPU Units cannot be connected with the 1:1 connection NT link
method. Use the 1:N connection NT link method (standard or high-speed) in-
stead to make the 1:1 connection. For details, refer to Using the NT link (1:N)
Method (page 109) or Using the High-speed NT link (1:N) Method (page 113).
5-2-1 Host Types and Settings
The types of host that have an RS-422A port and can be connected to the
RS-422A/485 port of the NT31/NT31C, and the settings to be made at the
host, are described here.
PT Host
RS-485 cable
(
max. 500 m
)
PT
Host
RS-422A cable
(max. total length 500 m)
PT
Host
RS-485 cable
(max. total length 500 m)
NT31
NT31C
PLC
PLC
NT31
PLC
NT31C NT31CNT31 NT31 NT31 NT31 NT31
(At termination)
Relay terminal block Relay terminal bloc
k
Max. 2 m
Exam
p
le of Good Connection Exam
p
les of Bad Connections
(Not at
termination)
(Not at
termination)
(Not at
termination)
(At
termination)

Omron NT31 Specifications

General

Brand	Omron
Model	NT31
Category	Touch terminals
Language	English