4-1 1:1 Host Connection
4-1 1:1 Host Connection
4-1-1 Connection Methods
This section describes the methods for connecting the host to serial port A or B of the PT us-
ing RS-232C or RS-422A communications. The connection methods are as follows:
• Direct Connection using RS-232C
This is the easiest connection method. OMRON cables with connectors can be used, de-
pending on the host being connected.
RS-232C cable
(15 m max.)
HostPT
• A 1:1 Connection using RS-422A and an NS-AL002 RS-232C/RS-422A Converter
This connection method allows an extended communications distance of up to 500 m.
RS-422A cable
(500 m max.)
NS-AL002
Adapter
PT
Host
The NS-series PTs have two serial ports that can be used simultaneously. Therefore, two
hosts can be connected at the same time. Any combination of devices can be connected to
the PT.
RS-232C cable or
RS-232C/RS-422A Converter
+ RS-422A cable
PT Host 1
Host 2
Serial port A
Serial port B
(See note.)
(See note.)
Note: Each port allows 1:N connection. The NS-AL002 Converter can be connected to one serial port
only.
Note • Always tighten the connector screws after connecting communications cables.
• The connector’s pull load is 30 N.
Do not subject the connectors to a greater load than that specified.
• Supported RS-232C Host Units
Some models and series of OMRON PLCs have a built-in 1:1 NT Link function. Some PLCs
can also be connected in a 1:1 NT Link by adding a Serial Communications Board or Com-
munications Board.
When connecting the PT to a PLC, check the series and model of the PLC and the model of
the Board mounted to the PLC.
Refer to Appendix 8 Standard Models for details on the Units that can be connected to NS-
series PTs as hosts using RS-232C or RS-422A communications in a 1:1 NT Link.
Reference
CS/CJ series CPU Units cannot be connected in a 1:1 NT Link. Use a 1:1 connection
through 1:N NT Links (normal or high speed). For details, refer to 1:N NT Links or High-
speed 1:N NT Links in Section 4-2 1:N Host Connection.
4-2
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