2-11
2 Installing the NB Unit and Connecting Peripheral Devices
NB-series Programmable Terminals Setup Manual(V107)
2-4 Serial Communication Connection
2
2-4-1 Host Link Connection Method
2-4 Serial Communication Connection
Host Link is a connection method in which one PLC is connected to one NB Unit. There are 2 kinds of
connection methods: RS-232C and RS-422A.
The RS-232C connection method using serial ports COM1/COM2
This is the simplest and most feasible method.
The following cables are recommended.
XW2Z-200T (Cable length: 2m) by OMRON
XW2Z-500T (Cable length: 5m) by OMRON
The RS-422A connection method using the serial port COM2
With this method, the communication distance can be extended to a maximum of 500m.
The following cables are recommended.
NB-RSEXT-2M (Cable length: 2m) by OMRON
Note please adopt 4-wire RS-422A connection, and Host Link does not support 2-wire RS-485 connection.
Connectable Units at the host side
When using OMRON PLCs, the Units with built-in Host Link function vary depending on models and
series. There is also the CPU Unit connected in a Host Link method through adding the serial
communication board or communication board.
When connecting, confirm the connected PLC’s series, model and the models of the installed circuit
board/Unit.
As to the Units at the host side which can be connected to NB series Unit by RS-232C or RS-422A
through a Host Link, refer to A-5 List of Models in the NB Series Setup Manual.
2-4-1 Host Link Connection Method
RS-232C cable
(maximum length: 15m)
NB Unit
Host
RS-422A cable
(maximum length: 500m)
NB Unit
Host
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