The Type Of Host And Settings - Omron Programmable Terminals NT631 Setup Manual

Connecting to the Host's RS-232C Port
Note
Reference:
5-1-1

The Type of Host and Settings

Settings at the RS-232C/
RS-422A Adapter (NT-
AL001)
PT
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.
PLC
(At termination)
Relay terminal block
Max. 2 m
NT631C NT631 NT631
NT631
(Not at
(Not at
(At
termination) (Not at
termination)
termination)
termination)
Example of Good Connection
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) instead to make the 1:1 connection. For details, refer to Using the NT
Link (1:N) Method (page 65) or Using the High-speed NT Link (1:N) Method
(page 70).
The using condition is the same as the connecting PT side RS-232C and the
host side RS-232C.
For the available type and settings of the host, refer to the pages listed below.
Method
Host link
NT Link (1:1)
NT Link (1:N)
High-speed NT Link (1:N) Using the High-speed NT Link (1:N) Method (page 70)
Memory link
When making a connection between RS-232C and RS-422A/485 ports using
an RS-232C/RS-422A Adapter, set the DIP switches on the NT-AL001 as fol-
lows.
RS-232C/RS422A
convertor unit
RS-232C
RS-485 cable
cable
(max. total length
(max. 2 m)
500 m)
PLC
NT631 NT631C NT631
Examples of Bad Connections
Reference
Host Link Method (page 48)
NT Link (1:1) method (page 61)
Using the NT Link (1:N) Method (page 65)
Memory Link Method (page 73)
Section 5-1
Host
PLC
Relay terminal block
NT631 NT631C NT631
81